sfm design & engineering guide

PUB16APR29

DESIGN & ENGINEERING GUIDEWITH INSTALLATION PROCEDURES

Table of ContentsGetting Started ‐ How to Use this Guide…………………………………………………………………………………………………………………………………………………………………1Introduction……………………………………………………………………………………………………………………………………………………………………………….………………………… 2Installers Responsibility/Disclaimer…………………………………………………………………………………………………………………………………………………………………………3Design Methodology………………………………………………………………………………………….……………………………………………………………………………………………………4Project Requirements & Design Aids………………………………...……………………………………………………………………………………………………………………………………5Prescriptive Design Method ‐ Quick Design Steps……………………………...……………………………………………………………………………………………………………………6Analytical Method ‐ ASCE 7‐05…………………………………………………………………………….…………………………………………………………………………………………………8Analytical Method ‐ ASCE 7‐10……………………………………………………………….………………………………………………………………………………………………………………15Prescriptive Pressure Tables………………………………………………………………………..…………………………………………………………………………………………………………22System Application Rules…………………………………………………………………...………………………………………………………………………………………………………………… 26System Layout Rules……………………………………………………………………………………….………………………………………………………………………………………………………28Technical Support……………………………………………………………………………………………………………………………………………………………………………………………………31Installation Guide………………………………………………………………………………………………………………..…………………………………………………………………………………32Appendix…………………………………………………………………………………………………………………………...……………………………………………………………………………………52

TABLE OF CONTENTSDESIGN & ENGINEERING GUIDE

Getting Started ‐ How to Use this Guide

Areas of Interest for Designers/Developers: Areas of Interest for AHJ/Building Officials)System Components (Installation Guide) System Components (Installation Guide) Module Compatibility (Installation Guide) Module Compatibility (Installation Guide)Design Methodology Prescriptive Design Method ‐ Quick Design StepsProject Requirements & Design Aids ASCE 7‐05 Analytical MethodPrescriptive Design Method ‐ Quick Design Steps ASCE 7‐10 Analytical MethodASCE 7‐05 Analytical Method Prescriptive Pressure TablesASCE 7‐10 Analytical Method System Application RulesPrescriptive Pressure Tables System Layout RulesSystem Application Rules Grounding & Bonding (Installation Guide)System Layout Rules Sample Calculation (Appendix)Installation Guide

Areas of Interest for Installers:System ComponentsInstaller Responsibility/DisclaimerInstallation Guide

1HOW TO USE THIS GUIDEDESIGN & ENGINEERING GUIDE PAGE

Introduction

2

SunFrame MicroRail (SFM) by Unirac, Inc. offers a fully integrated, solar racking solution for residential sloped roofs. SFM empowers system installersby providing pre‐assembled components with integrated bonding and innovative installation features, while eliminating long rails and loosehardware. System designers are equipped with Unirac's proven user friendly online desing tool, prescriptive tables, and easy to follow design steps, tocreate code compliant designs and complete bill of material outputs.

SFM is developed specifically for use as a "flush to roof" photovoltaic solar racking system to pitched roofs for 60‐cell modules only. Unirac, Inc. alsohas racking product solutions for ballasted, flat roof, rail based flush to roof, and rail based tilted racking solutions. To learn more about our rackingoptions, go to www.unirac.com.

INTRODUCTIONDESIGN & ENGINEERING GUIDE PAGE

Installers Responsibility

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Unirac shall not be liable for any losses, damages, or injuries that directly or indirectly result from any non‐conformance with the above.

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Ensuring that the roof, its rafters, connections, and any other structural support members can support the array under all code levelloading conditions (this total building assembly is referred to as the building structure);Using only Unirac parts and installer‐supplied parts as specified by Unirac (substitution of parts may void the warranty and invalidatethe letters of certification in all Unirac publications);

Ensuring correct and appropriate design parameters are used in determining the design loading used for design of the specificinstallation. Parameters, such as snow loading, wind speed, exposure, and topographic factor should be confirmed with the localbuilding official or a licensed professional engineer.

Array shading and output analysis;Ensuring safe installation of all electrical aspects of the PV array, including proper grounding/bonding;Maintaining the waterproof integrity of the roof, including selection and proper installation of appropriate flashing;Verifying the strength of any alternate mounting if used in lieu of the lag screws;Ensuring that lag screws have adequate pullout strength and shear capacities as installed;

Complying with all applicable local or national building codes, including code requirements that are more strenuous than the guidelinesset forth in this manual;

Ensuring that Unirac and other products are appropriate for the particular installation and the installation environment.

3

Please review this guide thoroughly before installing your SunFrame MicroRail system. This guide provides supporting documentation for building permit applications, planning and assembly the SunFrame MicroRail System.

The installer is solely responsible for:

Maintaining and enforcing all aspects of a safe working environment;

INSTALLERS RESPONSIBILITYDESIGN & ENGINEERING GUIDE PAGE

Design Methodology

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Note: Please review Table 1 in the Project Requirements and Deisgn Aids section of this Guide to choose the appropriate design aid. Unirac'sonline desing tool is highly recommended for all projects. It will provide you with a Bill of Materials, Certification Letter, and Calculations for yourproject.

SunFrame MicroRail was designed using the Minimum Design Loads for Buidings and Other Structures by the American Society of Civil Engineers andStructural Engineering Institute, 2005 and 2010 editions. These are referred to as ASCE/SEI 7‐05 and ASCE/SEI 7‐10, respectively. Analytical desingsteps for both ASCE/SEI 7‐05 and ASCE/SEI 7‐10 are provided in this guide to demonstrate our interpretation of these codes and outline our designmethodology as it applies specifically to the SunFrame MicroRail product. A sample calculation can be found in Appendix E. Three methods have beenprovided to aid in design of your project. When to use each method is discussed in the project requirements & Design Aids section on the followingpage.

4DESIGN METHODOLOGYDESIGN & ENGINEERING GUIDE PAGE

No

No Size Limit

1, 2, and 3Appendix

2.094psf - 3.056psf 39in - 41in

Allowable Stress DesignYesYesYes

1, 2, or 3Appendix

Project Requirements and Design Aid

0-45 Degrees0-45 Degrees

ASCE 7-05/ASCE 7-10

II

B,C or D

As Permitted by Code

ASCE 7-05/ASCE 7-10

II

B, C or D

Current Adopted Building Code:Local Jurisdiction Code Amendments:

Occupancy/Risk Category*:

Wind Exposure Category*:Ground Snow Load*:

Stamped/Certified Engineering Letter for Solar System Provided:Bill of Materials for Unirac Components of Solar System Provided:

Seismic Coefficient, Ss*:Roof Height (Eave & Ridge)*:

Roof Slope*:Roof Zone(s)*:

Framed Module Type & Module*:Module Weight*:

Design Method:

Module Width*:Total Module Quantity*:

Table 1 - Project Requirements & Design AidProject Requirements

(Blank Cells for Project Specific Input Provided for your Convenience)

Prescriptive Design

Method1b

Design Aid

Online Design Tool1aProject Name:

Project Address:AHJ (Authority Having Jurisdiction):

Basic Wind Speed*: 85-170 mph

User InputUnlimited**

No

User InputUser Input

***<3.1g

***85-150mph/110-190mph

No

2.094psf - 3.056psf 39in - 41inUp to 500

No

0-60 psf<3.1g

15, 30 or 60 feet 15, 30 or 60 feet

YesNo

* Requirements must fall within defined range to utilize specified design aide. ** The design professional could use the appropriate code method to perform the design in LRFD, LSD, or ASD. *** PrescriptivePressure tables located in this guide on pgs. 22‐25, in Appendix B and Online. 1a. This is an easy‐to‐use online design tool that is recommended for all preliminary and final designs, estimating, and layoutvalidation. It is located on our website at www.unirac.com. The Online Design Tool allows for a customized project design that results in a final design, bill of materials, price quote and stamped/certifiedengineering approval letters. 1b. Prescriptive Design Method: This method is a simplified‐analytical approach to the design of your SFM project. This method is recommended when computers or internetaccess is not available. Once project specific requirements are known, the project design load pressures can be looked up in the Prescriptive Tables ((4) located in this guide on pgs. 22‐25 and (10)located inAppendix B). If additional tables are needed, they can be found online at www.unirac.com. Once the load pressures (by roof zone) have been identified, they are color coded to the appropriate application andlayout rules. 1c. Do It Yourself (Analytical Method): This design approach follows the ASD calculations step by step through both the ASCE 7‐05 and 7‐10 design codes. Equations, figures, tables, andcommentary are provided for your convenience to aid in generating the specific design load pressures for your loading conditions, such as wind and snow. This method has been provided for design or layoutrequirements that fall outside of the other two options or for design professionals that prefer to create their own calculation packages.

5

Do It Yourself1c

(Analytical Method)

ASCE 7-05/ASCE 7-10

As Permitted by Code

As Permitted by CodeAs Permitted by CodeAs Permitted by CodeAs Permitted by CodeAs Permitted by CodeAs Permitted by Code

User Input

Project Specific Calculations for Solar System Provided:

PROJECT REQUIREMENTSDESIGN & ENGINEERING GUIDE PAGE

Prescriptive Design Method ‐ Quick Design Steps

Step 1: Define Project Requirementsa.b.c.

Step 2: Create Initial Array Layouta.

b.

Step 3: Determine Array Design Pressure by Roof Zonea.b.

Identify the structural supporting members of your building. A sketch/drawing of the roof with location of supporting members, vents, skylights, cable/wires, areas to avoid, etc., is highly recommended.Create a "rough draft" layout of solar modules on the actual project roof. (Refer to System Application & Layout Rules pgs. 26-28)

Use information in steps 1 & 2 and go to the prescriptive pressure tables, in the Appendix B. Use fill-in boxes below to document your project specific pressures and tables utilized.

Note: Not all prescriptive pressure tables have been included in the appendix. If your project specific pressures are unavailable, the following steps should be followed; a) Go to www.unirac.com and access the SFM design tool. b) input your project specific requirements. c) design pressures will be generated for you based on your project specific inputs. d) these pressures (by roof zone) will be used to follow through the remaining steps below.

6

Fill in the Table 1 - Project Requirements & Design AidOnce project specific information is determined, confirm that the prescriptive design method may be utilized. Review the Prescriptive Tables in the Appendix to see if they meet your needs. If a more precise design is needed (if the tables in the Appendix don't meet your project requirements, but per Table 1, you can still utilize the Perscriptive Design Method) please utilize the online tool for design.

PRESCRIPTIVE DESIGN METHODDESIGN & ENGINEERING GUIDE PAGE

Prescriptive Design Method ‐ Quick Design Steps (Continued)

Project Criteria: Controlling Pressure:

c. Record the SunFrame Micro Rail Rules:

Interior Rows: North Row:

Can Consecutive Spans be Utilized per the Rules?

Step 4: Look-up Layout and Attachment Guidelines for Arraya.

Step 5: Define Grounding & Bonding Patha. Refer to the Installation Guide for how to determine the Grounding and Bonding Path.

Review your layout in Step 2 above, the rules as recorded in Step 3c above, and the System Application & Layout Rules to determine potential attachment points to your structure and if additional support will be required to support your system.

Span Overhang SpanOverhang

*Record the rule with the highest number in this column of cells. For example, if the rule for Up is 1, Down is 2, Side is 1, and Lateral is 3 across a row (roof zone), input and utilize Rule 3 as stated in the Appendix.

Down Slope(psf)

Lateral (psf) Rule*Up (psf) Down (psf)

Roof zone 3:

Pressure Table Title -Building Height -

Exposure Category - Seismic Factor (Ss) -

Roof Pitch - Roof zone 2: Roof zone 1:

7PRESCRIPTIVE DESIGN METHODDESIGN & ENGINEERING GUIDE PAGE

Analytical Method - ASCE 7-05

Commentary:

Notes / Clarifications:

Step 1: User Inputs (ASCE 7-05)

Pg = Ground Snow Load in PSF. Ground Snow Loads (ASCE 7-05, Figure 7-1)

Ground Snow Load (psf):

Determine the Roof Zone (1, 2 or 3) (ASCE 7-05, Figure 6-3)

Convert roof pitch to angle in degrees [See Appendix C]

Roof Angle (degrees):

Determine the Exposure Category (B, C or D) by using the definitions for Surface Roughness Categories (ASCE 7-05, Sections 6.5.6.2 and 6.5.6.3)

Wind Exposure Category:

ASCE 7-05 (Figures 22-1 through Figure 22-14)0 PSF, 20 PSF, etc.

Solar Module Length (in):Solar Module Width (in):

Solar Module Weight (lb):Module Dead Load (psf):

8

Mean roof height (15 ft, 30 ft, or 60 ft)

Per Basic Wind Speed-US Map (ASCE 7-05, Figure 6-1)

1) Most Building Officials allow for all or a portion of the roofs original live load design load to be removed/reduced at the time that solar panels are being added to the roof. The rationale behind this is that live load or roof foot traffic is eliminated or reduced to designated paths. in other words, the roof top solar array and live load foot traffic cannot occupy the same space. If all of the roof live load can be utilized by the proposed solar array, 0 PSF should be entered.

Roof Height (ft):

Basic Wind Speed (MPH):

Roof Live Load1 (psf):Module Manufacturer/Type:

Roof Zone:

Seismic Factor Ss (g):

ANALYTICAL METHOD ASCE 7-05DESIGN & ENGINEERING GUIDE PAGE

Commentary:

Wind Pressure Equation - Method 2 - Analytical Method (ASCE 7-05, Section 6.5):

Pn=qh (GCpn-GCpi) (ASCE 7-05, Section 6.5.12.4.1) (GCpn - Negative Uplift Factor)GCpi equals zero (per AC428, November 2012) (internal pressure coefficient)

GCpp (Positive downforce factor) GCpn (Negative uplift factor)

qh = qz

Kz

Kd

V Basic Wind Speed in MPH from User Inputs in Step 1I

Kzt

Directionality Factor (ASCE 7-05, Table 6-4)

Calculate the wind pressure for uplift and downforce, using GCpn & GCpp respectively, in the provided boxes.

Pp=qh (GCpp-GCpi) (ASCE 7-05, Section 6.5.12.4.1) (GCpp - Positive Downforce Factor)

GCp is defined below (ASCE 7-05 Figure 6-11) and is a function of the roof zone, effective wind area (feet squared), and roof angle (degrees) (external pressure coefficient)

2) Typical values for the Importance Factor are 0.87 based on Occupancy Category I and 1.0 based on Occupancy Category II. Occupancy I is defined by ASCE 7-05 to mean "Buildings and other structures that present a low hazard to human life in the event of failure…".

Velocity Pressure Coefficient (ASCE 7-05, Table 6-3) Topographic Factor (ASCE 7-05, Section 6.5.7.2 & Figure 6-4)

qz=0.00256Kz*Kzt*Kd*V^2*I (ASCE 7-05, Section 6.5.10)

Importance Factor2 (ASCE 7-05, Table 6-1)

Step 2: Wind Pressure (ASCE 7-05, Chapter 6)

(ASCE 7-05, Figure 6-11C) for roof angles > 7° and ≤ 27°(ASCE 7-05, Figure 6-11D) for roof angles > 27° and ≤ 45°

(ASCE 7-05, Figure 6-11B) for roof angles ≤ 7°

9ANALYTICAL METHOD ASCE 7-05DESIGN & ENGINEERING GUIDE PAGE

Commentary:

Calculated Dead Load in the provided boxes.

Step 4: Snow Load (ASCE 7-05, Chapter 7)

Sloped Roof Snow Load Pressure Equation:

Pg

Cs

Ct

ICe

Ground Snow Load4 (psf) from User inputs in Step 1.Slope Factor (ASCE 7-05, Figure 7-2)Thermal Factor5 (ASCE 7-05, Table 7-3)Importance Factor6 (snow) (ASCE 7-05, Table 7-4) Exposure Factor (ASCE 7-05, Table 7-2)

3)To be combined with the module dead load and used in wind load combinations.

4)The ground snow load is utlilized to calculate the roof snow load, which is the load applied to the structure.

5) From Section C7.8 of ASCE 7-05, "the collectors should be designed to sustain a load calculated by using the "unobstructed slippery surfaces" curve in Fig. 7-2a". This graph recommends the use of a Ct value of less than or equal to 1.0.

6) The Snow Importance Factor for Occupancy Category I = 0.8 and for Occupancy Category II = 1.0.

Total Dead Load (psf):

Sum of module dead load and racking system dead load

Ps=0.7*Cs*Ce*Ct*I*Pg (ASCE 7-05, Section 7.3)

Module Dead Load (psf):

Racking System Dead

Load3 (psf):

Module Dead Load (psf) should be determined from User Inputs in Step 1[See Appendix D] (The racking system dead load should be taken as the total weight of the racking system (hardware, rails, nuts, bolts, attachments, etc.) divided by the total module area of the system.) Component weights can be found in the technical data sheets.

Calculated Ps (Sloped roof snow load) in the provided boxes.

10

Step 3: Dead Load


Step 5: Seismic Load (ASCE 7-05) Commentary:

Calculate seismic loads for both horizontal and vertical in the provided boxes.

Seismic Load Equation (Horizontal):

Fp need not exceed 1.6*SDS*Ip*Wp and Fp shall not be less than Fp=0.3*SDS*Ip*Wp

ap

Rp

SDS Spectral Acceleration (ASCE 7-05, Section 11.4.4) SDS=2/3*SMS

Fa

Ss

Ip

Seismic Load Equation (Vertical):Fp(vertical)=±0.2*SDS*Wp (ASCE 7-05, Section 12.4.2.2)psf (seismic load (vert.) on the module, divide Fp by the effected area)

zHeight in structure of point of attachment of component with respect to the base (ASCE 7-05, Section 13.3.1) average roof height of structure with respect to the base (ASCE 7-05, Section 13.3.1)

h

Component operating weight (lbs) (determine by using total dead load (PSF) multiplied by the effected area (SF) of the component or attachment

Wp

Seismic Importance Factor9 (ASCE 7-05, section 13.1.3)

Component Response Modification Factor8 (ASCE 7-05, Table 13.6-1)

Site Coefficient (ASCE 7-05, Table 11.4-1) SMS=Fa*Ss (ASCE 7-05, Section 11.4.3)

from User Inputs in Step 1

Fp(horizontal)=[(0.4*ap*SDS*Wp)/(Rp/Ip)]*(1+2*z/h) (ASCE 7-05, 13.3.1)

7) The Component Amplification Factor (ap) for flush‐mount systems should be taken as 1.0 (AC428, Section 3.1.3.3).

8) The Component Response Modification Factor (Rp) for flush‐mounted systems should be taken as 1.5 (AC428, Section 3.1.3.3).

9) The Seismic Importance Factor for Occupancy Categories I and II = 1.0.

psf (seismic load (horiz.) on the module, divide by Fp the effected area)Component Amplification Factor7 (ASCE 7-05, Table 13.6-1)


Step 6: Rewrite Your Loads

*Depending on your coordinate system, certain loads will need to be split into their horizontal and verticalcomponents.

psfpsfpsfpsflbspsf

Step 7: Load Combinations (ASCE 7-05, Chapter 2, Section 2.4.1)

*The load combinations below have been identified as the likely controling cases for the roof structure.

1) D 8) D + 0.75(0.7E) + 0.75Lr D = Dead Load2) D + Lr 9) D + 0.75(0.7E) + 0.75S Lr = Live Load to Roof3) D + S 10) D + 0.7E S = Snow Load4) D + Wup 11) 0.6D + Wup Wup = Wind Load Up5) D + Wdown 12) 0.6 D + Wdown Wdown = Wind Load Down6) D + 0.75Wdown + 0.75S 13) 0.6 D + 0.7E E = Earthquake/Seismic Load7) D + 0.75Wdown + 0.75Lr

Step 8: Create Initial Array Layout

b.

a.

Create a "rough draft" layout of solar modules on the actual project roof. (Refer to System Application & Layout Rules)

Identify the structural supporting members of your building. A sketch/drawing of the roof/building with location of supporting members, vents, skylights, cable/wires, areas to avoid, etc., is highly recommended.

Total Dead Load:Wind Pressure Up:

Wind Pressure Down:Snow Load:

Seismic Load Horizontal:Seismic Load Vertical:


Step 9: Determine Array Design Pressure by Roof Zone

a.b.





Rule*

Overhang SpanOverhang

13

Using information in steps 1 & 2 and go to the prescriptive pressure tables, in the Appendix B. Use fill-in boxes below to document your project specific pressures and tables utilized.

Note: Not all prescriptive pressure tables have been included in the appendix. If your project specific pressures are unavailable, the following steps should be followed; a) Go to www.unirac.com and access the SFM design tool. b) input your project specific requirements. c) Design pressure will be generated for you based on your project specific inputs. d) these pressures (by roof zone) will be used to follow through the remaining steps below.


Span

Roof zone 2:Roof zone 3:

Up (psf)Pressure Table Title -

Building Height -Exposure Category -

Lateral (Ss) -Roof Pitch -

Roof zone 1:

Down (psf)Down Slope

(psf)Lateral (psf)


Step 10: Look-up Layout and Attachment Guidelines for Array

Step 11: Determine Load to the Roof

a. To determine the load on the roof through the attachment:i. Determine the tributary area to each attachment.ii. Review the controlling pressure in Steps 6 and 7.iii.iv. Multiply the tributary area by the roof pressure to obtain loads to the roof attachment.v. Determine the point load to the roof at each attachment.vi. Appendix E contains a sample calculation for reference.

Step 12: Check Roof Load

a. Ensure that the supporting structure is capable of withstanding the additional loads imposed by the proposed solar system.

Step 13: Define Grounding & Bonding Path

a.

14

Refer to the Installation Guide for how to determine the Grounding and Bonding Path.

a.Review your layout in Step 8 above, the rules as recorded in Step 9c above, and the System Application & Layout Rules to determine potential attachment points to your structure and if additional support will be required to support your system.

Determine pressure zones on the roof per the layout and attachment guidelines in the Installation Guide.


Analytical Method - ASCE 7-10

Commentary:

Notes / Clarifications:

Solar Module Width (in):Solar Module Weight (lb):Module Dead Load (psf):

Roof Live Load1 (psf): 0 PSF, 20 PSF, etc.Module Manufacturer/Type:

Solar Module Length (in):

Roof Zone: Determine the Roof Zone (1, 2 or 3)(ASCE 7-10, Figure 30.5-1)

Ground Snow Load (psf):Pg = Ground Snow Load in PSF. Ground Snow Loads (ASCE 7-10, Figure 7-1)

Seismic Factor Ss (g): ASCE 7-10 (Figures 22-1, 22-3, 22-25 and 22-6)

Convert roof pitch to angle in degrees [See Appendix C]

Basic Wind Speed (MPH): Per Basic Wind Speeds for Risk Category I (ASCE 7-10, Figure 26 5-1A)

Wind Exposure Category:Determine the Exposure Category (B, C or D) by using the definitions for Surface Roughness Categories (ASCE 7-10, Sections 26.7.2 and 26.7.3)

15

Step 1: User Inputs (ASCE 7-10)1) Most Building Officials allow for all or a portion of the roofs original live load design load to be removed/reduced at the time that solar panels are being added to the roof. The rationale behind this is that live load or roof foot traffic is eliminated or reduced to designated paths. in other words, the roof top solar array and live load foot traffic cannot occupy the same space. If all of the roof live load can be utilized by the proposed solar array, 0 PSF should be entered.

Roof Height (ft): Mean roof height (15 ft, 30 ft, or 60 ft)

Roof Angle (degrees):


Wind Pressure Equation - Components & Cladding (ASCE 7-10, Section 30.4.2):

Pn=qh (GCpn-GCpi) (ASCE 7-10, Section 30.4.2) (GCpn - Negative Uplift Factor)GCpi equals zero (per AC428, November 2012) (internal pressure coefficient)

GCpp (Positive downforce factor) GCpn (Negative uplift factor)

qh = qz

Kz

Kd

V Basic Wind Speed in MPH from User Inputs in Step 1

Velocity Pressure Coefficient (ASCE 7-10, Table 30.3-1)

KztTopographic Factor (ASCE 7-10, Section 26.8 & Figure 26.8-1)Directionality Factor (ASCE 7-10, Table 26.6-1)

GCp is defined below (ASCE 7-05 Figure 6-11) and is a function of the roof zone, effective wind area (feet squared), and roof angle (degrees) (external pressure coefficient)

(ASCE 7-10, Figure 30.4-2A) for roof angles ≤ 7° (ASCE 7-10, Figure 30.4-2B) for roof angles > 7° and ≤ 27° (ASCE 7-10, Figure 30.4-2C) for roof angles > 27° and ≤ 45°

qz=0.00256*Kz*Kzt*Kd*V^2 (ASCE 7-10, Section 30.3.2)

16

Step 2: Wind Pressure (ASCE 7-10, Chapter 30)Calculate the wind pressure for uplift and downforce, using GCpn & GCpp respectively, in the provided boxes.

Pp=qh (GCpp-GCpi) (ASCE 7-10, Section 30.4.2) (GCpp - Positive Downforce Factor)


Commentary:

Calculated Dead Load in the provided boxes.


Sloped Roof Snow Load Pressure Equation:

PgCsCt

ICe

Ground Snow Load3 (psf) from User inputs in Step 1.Slope Factor (ASCE 7-10, Figure 7-2) Thermal Factor (ASCE 7-10, Table 7-3) Importance Factor4 (snow) (ASCE 7-10, Table 1.5-2) Exposure Factor (ASCE 7-10, Table 7-2)

[See Appendix D] (The racking system dead load should be taken as the total weight of the racking system (hardware, rails, nuts, bolts, attachments, etc.) divided by the total module area of the system.) Component weights can be found in the technical data sheets.

Total Dead Load (psf):

Sum of module dead load and racking system dead load

Ps=0.7*Cs*Ce*Ct*I*Pg (ASCE 7-10, Sections 7.3 & 7.4 Flat and Sloped Roof Snow Loa

17

Step 3: Dead LoadCalculated Ps (Sloped roof snow load) in the provided boxes. 2)To be combined with the module dead load and

used in wind load combinations.

3)The ground snow load is utlilized to calculate the roof snow load, which is the load applied to the structure.

4) The Snow Importance Factor for Occupancy Category I = 0.8 and for Occupancy Category II = 1.0.

Module Dead Load (psf):

Module Dead Load (psf) should be determined from User Inputs in Step 1

Racking System Dead

Load3 (psf):


Step 5: Seismic Load (ASCE 7-10) Commentary:

Calculate seismic loads for both horizontal and vertical in the provided boxes.

Seismic Load Equation (Horizontal):

Fp need not exceed 1.6*SDS*Ip*Wp and Fp shall not be less than Fp=0.3*SDS*Ip*Wp

ap

Rp

SDS Spectral Acceleration (ASCE 7-10, Section 11.4.4) SDS=2/3*SMS

Fa

Ss

Ie

Seismic Load Equation (Vertical):Fp(vertical)=±0.2*SDS*Wp (ASCE 7-10, Section 12.4.2.2)psf (seismic load (vert.) on the module, divide Fp by the effected area)

zHeight in structure of point of attachment of component with respect to the base (ASCE 7-10, Section 13.3.1)

haverage roof height of structure with respect to the base (ASCE 7-10, Section 13.3.1)

Site Coefficient (ASCE 7-10, Table 11.4-1) from User Inputs in Step 1

Wp

Seismic Importance Factor7 (ASCE 7-10, section 1.5-2)

5) The Component Amplification Factor (ap) for flush‐mount systems should be taken as 1.0 (AC428, Section 3.1.3.3).

6) The Component Response Modification Factor (Rp) for flush‐mount systems should be taken as 1.5 (AC428, Section 3.1.3.3).

7)The Seismic Importance Factor for Occupancy Categories I and II = 1.0.

Fp(horizontal)=[(0.4*ap*SDS*Wp)/(Rp/Ip)]*(1+2*z/h) (ASCE 7-10, 13.3.1)

psf (seismic load (horiz.) on the module, divide by Fp the effected area)Component Amplification Factor (ASCE 7-10, Table 13.5-1) Component Response Modification Factor6 (ASCE 7-10, Table 13.5-1)

SMS=Fa*Ss (ASCE 7-10, Section 11.4.3)

Component operating weight (lbs) (determine by using total dead load (PSF) multiplied by the effected area (SF) of the component or attachment


Step 6: Rewrite Your Loads

*Depending on your coordinate system, certain loads will need to be split into their horizontal and verticalcomponents.

psfpsfpsfpsflbspsf

Step 7: Load Combinations (ASCE 7-10, Chapter 2, Section 2.4.1)

*The load combinations below have been identified as the likely controling cases for the roof structure.

1) D 8) D + 0.75(0.7E) + 0.75Lr D = Dead Load2) D + Lr 9) D + 0.75(0.7E) + 0.75S Lr = Live Load to Roof3) D + S 10) D + 0.7E S = Snow Load4) D + 0.6Wup 11) 0.6D + 0.6Wup Wup = Wind Load Up5) D + 0.6Wdown 12) 0.6 D + 0.6Wdown Wdown = Wind Load Down6) D + 0.75(0.6Wdown) + 0.75S 13) 0.6 D + 0.7E E = Earthquake/Seismic Load7) D + 0.75(0.6Wdown) + 0.75Lr

Step 8: Create Initial Array Layout

b. Create a "rough draft" layout of solar modules on the actual project roof. (Refer to System Application & Layout Rules)

Seismic Load Horizontal:Seismic Load Vertical:

a.Identify the structural supporting members of your building. A sketch/drawing of the roof/building with location of supporting members, vents, skylights, cable/wires, areas to avoid, etc., is highly recommended.

Wind Pressure Up:Wind Pressure Down:

Snow Load:

19

Total Dead Load:


Step 9: Determine Array Design Pressure by Roof Zone

a.b.






Roof Pitch - Roof zone 3:

Overhang Span Overhang Span

Lateral (Ss) -Exposure Category - Roof zone 1:

Roof zone 2:

Building Height -Pressure Table Title -

Up (psf) Down (psf)Down Slope

(psf)Lateral (psf) Rule*

20

Using information in steps 1 & 2 and go to the prescriptive pressure tables, in the Appendix B. Use fill-in boxes below to document your project specific pressures and tables utilized.

Note: Not all prescriptive pressure tables have been included in the appendix. If your project specific pressures are unavailable, the following steps should be followed; a) Go to www.unirac.com and access the SFM design tool. b) input your project specific requirements. c) Design pressure will be generated for you based on your project specific inputs. d) these pressures (by roof zone) will be used to follow through the remaining steps below.


Step 10: Look-up Layout and Attachment Guidelines for Array

Step 11: Determine Load to the Roof

a. To determine the load on the roof through the attachment:i. Determine the tributary area to each attachment.ii. Review the controlling pressure in Steps 6 and 7.iii.iv. Multiply the tributary area by the roof pressure to obtain loads to the roof attachment.v. Determine the point load to the roof at each attachment.vi. Appendix E contains a sample calculation for reference.

Step 12: Check Roof Load

a. Ensure that the supporting structure is capable of withstanding the additional loads imposed by the proposed solar system.

Step 13: Define Grounding & Bonding Path

a. Refer to the Installation Guide for how to determine the Grounding and Bonding Path.

21

a.Review your layout in Step 8 above, the rules as recorded in Step 9c above, and the System Application & Layout Rules to determine potential attachment points to your structure and if additional support will be required to support your system.

Determine pressure zones on the roof per the layout and attachment guidelines in the Installation Guide.


22PRESCRIPTIVE PRESSURE TABLESDESIGN & ENGINEERING GUIDE PAGE

Rule1 25.4 33.1 9.7 2.92 28.6 41.8 12.3 3.33 38.1 59.8 17.5 4.3

50.8* 89.7* 23.4* 5.8*76.2* 119.6* 35.1* 8.7*

Rule1 38.1 46.9 9.7 n/a2 38.1 59.7 12.3 n/a3 38.1 59.8 17.5 n/a

50.8* 89.7* 23.4* n/a76.2* 119.6* 35.1* n/a

* Indicates values specifically provided for portions of arrays that may fall within roof zones 2 and 3 that yield pressures larger than those provided in Rule 3

Design Rule Definitions (refer to 3x4 landscape array on the following page ):ABCDEFGH

10*8*

32*24*

10* 32*

Trim Rail Dimensions(C)

Overhang (in)(D)

Span (in)down

down slope

lateral

Trim Rail is not required to be flush with the edge of the module. (+/-2" is acceptable.)

Max. Module Overhang - Length of module extending past the first or last roof attachment of the row.Max. Span - The span between MicroRail roof attachments.

up

Module width is limited to 39.37 in (1 meter.) Reduce spans linearly for modules wider than this.

Each section of Trim Rail and each module must be supported by at least 1 attachment.

24

Note: Table and rules above are for landscape (60 cell) module orientation only.

8*

2118

Pressure Limits (psf)


up downdown slope

lateral

26

Non‐Tile Roof Installs

Max. Span for Trim Rail. (Measured between Trim Rail Roof Attachment)Max. Trim Rail Overhang - Length of Trim Rail extending past the first or last roof attachment of the row.

Trim Rail overhang from edge of Trim Rail to edge of Trim Rail Roof Attachment. (3" min)

48

726448

18

EcoFasten Flat, QuickMount Flashing

MicroRail Dimensions

Interior & North Rows24

(A)Overhang (in)

21

24*

Tile Roof InstallsEcoFasten Tile Replacement

FlashingPressure Limits (psf)

up downdown slope

lateral


up downdown slope

lateral

(B)Span (in)

7264

SYSTEM APPLICATION RULESDESIGN & ENGINEERING GUIDE PAGE

THE SFM TILE SOLUTION IS

CURRENTLY BEING REVIEWED AND VALIDATED

3x4 Landscape Array

See Installation Guide for detailed system layout procedure.

27

Overhang

SYSTEM APPLICATION RULESDESIGN & ENGINEERING GUIDE PAGE

B

B

A

F

D

E

indicates - SUNFRAME MicrorailTM 3"indicates - SUNFRAME MicrorailTM 9" Spliceindicates - SUNFRAME MicrorailTM 9" Attached Spliceindicates - Trim Rail Roof Attachment

C

The basic application rules for the SFM system are extremely simple.

Base Rules:●

●

●

X

Sample Layout A-1: 2x2 landscape array with 9" splice 1

2v

2h

3

4

5

Sample Layout A-2: 2x2 landscape array with 9" Attached Splice

28

4 Modules Intersecting at their Corners: 9" Splice - Interface between four modules in a grid pattern. (Roof attachment not required. See detail A on page 29.)

9" Attached Splice: Similar to 2h, 2v, & 4, roof attachment is required. (See detail B on page 29.)

Trim Rail: Must be installed at the southern-most edge (first row) of modules. (A minimum of (1) Trim Rail roof attachment required per length of Trim. See table on page 26.)

Basic Layouts

All modules must be supported at four corners on the North and South edges. Except at row 1, where the south edge of each first row module will be supported by Trim Rail.

Any intersection of module corners must be supported according to the following Connection/Attachment Rules.

All MicroRails are oriented in an east-west direction (perpendicular to roof slope).

Connection/Attachment Rules:3" MicroRails: Supporting attachments installed at applicable spans per design rules. (See table on page 26.)

Any outer edge module corner must be supported at the first rafter interior to the array.

2 Modules Vertical: 3" MicroRail - Interface between two modules oriented in the north-south direction in relation to each other whose nearest east or west edges are exposed.

2 Modules Horizontal: 9" Splice - Interface between any two modules oriented in the east-west direction in relation to each other along the exposed north edge. (Roof attachment not required. See detail A on page 29.)

3 Module Intersection with two Horizontal: 9" Splice - Interface between any three modules where two are oriented in the east-west direction in relation to each other. (Roof attachment not required. See detail A on page 29.)

SYSTEM LAYOUT RULESDESIGN & ENGINEERING GUIDE PAGE

29

Detail B: 9" Attached Splice at module intersection

Sample Layout B-1: 2x2 portrait array with 9" Splice

Detail A: 9" Splice at module intersection

Sample Layout B-2: 2x2 portrait array with 9" Attached Splice


Sample Layout D: Landscape with 3" MicroRail attachments only

Sample Layout E: Mixed array

30

Sample Layout F: Mixed array

Sample Layout C: Landscape array with 9" Splice


Technical Support

`

31

If you have further questions regarding the SunFrame MicroRail product, please contact Unirac at [email protected] or 505‐248‐2702. The Unirac website has an online calculator (U‐Builder) which when used, will direct you to a page with additional information regarding the SFM product.

TECHNICAL SUPPORTDESIGN & ENGINEERING GUIDE PAGE

INSTALLATION GUIDE SFM SUNFRAMEMICRORAIL™

PUB2016APR26

TABLE OF CONTENTSA- TOOLS & SPECIFICATIONSB- SYSTEM COMPONENTSC- SYSTEM COMPONENTSD- SYSTEM COMPONENTSE - SYSTEM LAYOUTF- FLASHING & SLIDERSG- 1ST ROW INSTALLATIONH- MICRORAIL INSTALLATIONI- MODULE MOUNTINGJ - MICROINVERTER & WIRE MGMT.K- MICROINVERTER & WIRE MGMT.L- FINISHING TOUCHESM- SYSTEM BONDING & GROUNDINGN- ENPHASE SYSTEM MICROINVERTER GROUNDING0- UL CODE COMPLIANCE NOTESP- TESTED / CERTIFIED MODULE LISTQ- MODULE MAINTENANCE

SFM SUNFRAMEMICRORAIL™ INSTALLATION GUIDE PAGE

TECHNICAL SPECIFICATIONS:

Material TypesAll extruded components: 6005A-T61 or 6061-T6 Aluminum

Hardware: Stainless Steel

Bonding and Grounding: Integrated in MicrorailTM (TrimraillTM and row to row bonding requires additional components)

TOOLS & SPECIFICATIONS A

TOOLS REQUIRED OR RECOMMENDED FOR LAYOUT, FLASHINGS & ROOF ATTACHMENTS:• Hammer• Marker / crayon• Measuring tape• Drill• Pilot drill bit• Pry bar• String line

TOOLS FOR MODULE INSTALL: • Drill and socket adapter or socket wrench• 1/2" socket • 1/4" hex driver• Torque wrench

SAFETY: All applicable OSHA safety guidelines should be observed when working on a PV installation job site. The installation and handling of PV solar modules, electrical installation and PV racking systems involves handling components with potentially sharp metal edges. Rules regarding the use of gloves and other personal protective equipment should be observed.

TORQUE SPECIFICATIONS:All SFM Hardware 20 ft-lbs

Grounding lugs Per Page "M"


SYSTEM COMPONENTS B

SUNFRAME Microrail™ 9" Attached SpliceSub-Components: 1. 9" Base2. 9" Cap3. (2) Clamp Socket Head Cap Screws4. Bonding Pins5. Helix6. Tower7. 6.75" Slider

Functions: • Module to roof attachment (when attachment is necessary

at splice point) • E-W module to module bonding

Features: • Arrives on-site preassembled and ready for installation• Check cap to determine module compatibility

• Supports discrete module thickness from 32mm to 46mm

• Receiving feature that allows simple module placement, tightening of fasteners and eliminates working over modules.

SUNFRAME Microrail™ 9" SpliceSub-Components: 1. 9" Base 2. 9" Cap 3. (3) Clamping Socket Head Cap Screw s 4. Bonding Pins

Functions: • 2,3 or 4 module support & connection • E-W module to module bonding

Features: • Arrives on-site preassembled and ready for installation• Check Cap to determine module compatibility

• Supports discrete module thickness from 32mm to 46mm


• Does not require attachment to roof

SUNFRAME Microrail™ - 3" Sub-Components: 1. 3" Base2. 3" Cap3. Clamp Socket Head Cap Screw4. Bonding Pin5. Helix6. Tower7. 6.75" Slider

Functions: • 1 or 2 module support to roof attachment

Features: • Arrives on-site preassembled and ready for installation• Check cap to determine module compatibility

• Supports discrete module thicknesses from 32mm to 46mm



SYSTEM COMPONENTS C

TrimrailTM Roof AttachmentSub-Components: 1. Trimrail roof attachment2. T-Bolt3. Tri-drive nut4. Dovetail locks5. Square nut6. Clamp bolt7. 3" Slider

Functions: • TrimrailTM to roof attachment / flashing

Features: • Slots provide vertical adjustments to level array• Slider provides north/south adjustment along the slope of

the roof.

TrimrailTM

Functions: • Front row structural support• Module mounting• Installation aid• Aesthetic trim

• Features: • Mounts directly to L-feet• Aligns and captures module leading edge• Available for various module heights

• Supports discrete module thicknesses from 32mm to 46mm

TrimrailTM SpliceFunctions: • Front row structural support• Installation aid• Structurally connects 2 pieces of TrimrailTM

• Features: • Aligns and connects TrimrailTM pieces• Compatible with all TrimrailTM profiles• Tool-less installation

CHECKCOMPATIBLEMODULE THICKNESS


SYSTEM COMPONENTS D

Wire Bonding Clip w/ 8AWGFunctions: • Row to row bonding• Module to TrimrailTM bonding

Features: • No fasteners required

Enphase Engage Cable ClipFunctions: • Securely attaches Enphase Engage cables to module

flanges• Allows three (3) mounting positions to suit any cable

orientation

Features: • Resists sliding to reduce cable slack

MLPE Mounting AssemblyFunctions: • Securely mounts MLPE to module frames• MLPE to module bonding

Features: • Mounts easily to typical module flange

MLPE = Module Level Power Electronics, e.g. microinverter or power optimizer


SYSTEM LAYOUT E

1. Determine appropriate array location on roof.

2. Select starting course of shingles (or tiles)

3. Mark next row of attachments and repeat for remaining rows

- NS distance equals module width +1"

4. Locate 1st rafter closest to array edge (and inside array footprint) and mark

5. Find next rafter for attachment based onappropriate span- Continue to end of array- Mark last rafter before end or array

Span

6. Mark attachment points on rafters along each NS module grid line

7. Verify design based on span and overhang rules

TO STAGGER ATTACHMENTS: Shift each subsequent row of attachments one rafter over.

See the Design and Engineering Guide for details on regional max spans and overhang.

N

S

N S


FLASHING & SLIDERS F

PILOT HOLES: Drill pilot holes for lag screws or structural screws (as necessary)

FLASHINGS: Place flashings

INSTALL SLIDERS AND TRIMRAIL ROOF ATTACHMENTS: • Insert flashings per manufacturer instructionsNOTE: Use Lag screw or structural fastener with a maximum diameter of 5/16" • Attach sliders to rafters• Verify proper row to row spacing for module size (Mod NS + 1")• Ensure that TrimrailTM roof attachments in each row have sufficient engagement with slider dovetails for proper attachment.

INSTALL SLIDERS AND TRIMRAILTM ROOF ATTACHMENTS: Follow manufacturer instructionsfor flashing installation procedures

ROOF RIDGE

EAVE

Mod NS + 1"

Mod NS + 1"


TIGHTEN SLIDER: Tighten front row lag screw and TrimrailTM roof attachments dovetail clamp bolt.

ALIGN FRONT ROW: Align front row TrimrailTM roof attachments with string line

TRIMRAIL PREPARATION: Determine overall length of TrimrailTM for front row. Determine splice locations (if any) and TrimrailTM

lengths required.

INSTALL TRIMRAIL SPLICE BARS: Place TrimrailTM with front side up and firmly insert splice bar into TrimrailTM, as required.

ATTACH SPLICE BARS: While holding TrimrailTM sections in alignment, join sections together with splice bar centered at joint.

See the Design and Engineering Guide for details on regional max spans and overhang.

1ST ROW INSTALLATION G


MICRORAIL INSTALLATION H

INSTALL MICRORAILS: Install remaining Microrails at marked attachment points. Loosen dovetail retaining fastener and push MicrorailTM to top of slider. DO NOT SLIDE ALL THE WAY OFF SLIDER.

TRIMRAIL ROOF ATTACHMENTS & TRIMRAIL ORIENTATION: TrimrailTM roof attachment should have horizontal flange facing uphill for uniform row spacing and ease of lag screw assembly. On first row, position TrimrailTM with module catch side facing uphill.

ATTACH TRIMRAIL TO ROOF ATTACHMENT: Attach rail using 3/8" T-bolts and serrated flange nuts. Make sure TrimrailTM is level across all TrimrailTM roof attachments. After rail is level, tighten dovetail bolts to secure TrimrailTM roof attachments to sliders.


SECTION B-BSCALE 1 : 1

B

B

MODULE MOUNTING I

FASTEN MODULES: Finish installing modules along row and tighten fastening bolts after entire row is installed.

ATTACH SPLICE: Attach splice at intersection of two (2) modules. • Use attached splice if necessary.• Ensure minimum module engagement using

indicator marks.


B

B


B

B

SEAT MODULE(S): Ensure that modules are properly seated in top cap and base.

TIGHTEN FASTENERS: Tighten fasteners to required torque.

LAY IN MODULE(S): Install first two (2) modules on bottom row. Install downhill end of module into the TrimrailTM first and then position uphill 3" microrails to support modules.

LAY IN MODULE(S): Module should slide into catch feature of the TrimrailTM.

Wire management is performed after each row of modules is installed. Refer to wire management section (Pgs. J & K) for detailed instructions.


MICROINVERTER & WIRE MGMT. J

PRE-INSTALL MICROINVERTERS: Install MLPE in a location on the module that will not interfere with microrails or grounding lugs. To use trunk cable most efficiently, install MLPE components in the same locations on all modules in the same row.


MICROINVERTER & WIRE MGMT. K

MICROINVERTER CONNECTION: Before securing a module to the Microrails, install trunk cable mounting clip on the connector block. Attach clip to module flange. Plug microinverter into connector.

WIRE MANAGEMENT: Verify wire management is complete after each row is installed.

MICROINVERTER: Before installing a row of modules place microinverter trunk cable.

TIPS & TRICKS: Tie a loose knot in the microinverter Engage connector wire to help manage the length.

TIPS & TRICKS:

MICROINVERTER TRUNK CABLE: The trunk cable can be managed securely by using stainless steel wire management clips attached to the module frame.

TIPS & TRICKS: Twisting the PV module wires and / or tying a loose knot can also help manage these wires.


FINISHING TOUCHES L

POST INSTALL HEIGHT ADJUSTMENT: Height adjustment of each attached MicrorailTM assembly can be performed by inserting a long 1/4" hex drive through the cap and into the helix. CAUTION: DO NOT RAISE THE BASE HIGHER THAN THE TOP OF THE TOWER.

N/S Bonding Clip: A N/S bonding clip must be used to bond adjacent rows of modules together.

SECTION F-FSCALE 2.5 : 1

F

F

TRIMRAIL BONDING: Attach a bonding clip from the TrimrailTM to an adjacent module. Fully seat bonding clip until radius portion is in contact with trim mating surface and module flange.

A

A


SYSTEM BONDING & GROUNDING M

E-W BONDING PATH: E-W module to module bonding is accomplished with 2 pre-installed bonding clips which engage on the secure side of the MicrorailTM and splice.

N-S BONDING PATH: N-S system bonding is accomplished through a N-S bonding clip. Insert each end of the N-S bonding clip onto a module frame flange. It is recommended that N-S bonding clips be installed on both edges of the array.

System bonding is accomplished through modules. System grounding accomplished by attaching a ground lug to any module.

LUG DETAIL & TORQUE INFOIlsco Lay-In Lug (GBL-4DBT)• 10-32 mounting hardware • Torque = 5 ft-lb• AWG 4-14 - Solid or Stranded

LUG DETAIL & TORQUE INFOIlsco Flange Lug(SGB-4)• 1/4” mounting hardware • Torque = 75 in-lb• AWG 4-14 - Solid or Stranded

LUG DETAIL & TORQUE INFOWiley WEEBLug (6.7)• 1/4” mounting hardware • Torque = 10 ft-lb• AWG 6-14 - Solid Only

NOTE: ISOLATE COPPER FROM ALUMINUM CONTACT TO PREVENT CORROSION

TERMINAL TORQUE, Install Conductor and torque to the following: 4-6 AWG: 35in-lbs8 AWG: 25 in-lbs10-14 AWG: 20 in-lbs

TERMINAL TORQUE,Install Conductor and torque to the following: 6-14 AWG: 5ft-lbs

TERMINAL TORQUE,Install Conductor and torque to the following: 4-14 AWG: 5-10in-lbs

WEEBLUGSingle Use Only

Star Washer isSingle Use Only


MICROINVERTER GROUNDING N

SECTION H-HSCALE 1.5 : 1

H

H

SFM EQUIPMENT GROUNDING THROUGH ENPHASE MICROINVERTERSThe Enphase M215 and M250 microinverters have integrated grounding capabilities built in. In this case, the DC circuit is isolated from the AC circuit, and the AC equipment grounding conductor (EGC) is built into the Enphase Engage integrated grounding (IG) cabling.

In order to ground the SunFrame Microrail racking system through the Enphase Microinverter and Engage cable assembly, there must be a minimum of three PV modules connected to the same trunk cable within a continuous array. Continuous array is defined as a grouping of modules installed and electrically bonded per the requirements of this installation guide. The microinverters are bonded to the SunFrame Microrail via the mounting hardware. Complete equipment grounding is achieved through the Enphase Engage cabling with integrated grounding (IG). No additional EGC grounding cables are required, as all fault current is carried to ground through the Engage cable.

ENPHASESYSTEM


UL CODE COMPLIANCE NOTES O

SYSTEM LEVEL FIRE CLASSIFICATIONThe system fire class rating requires installation in the manner specified in the SUNFRAME MICRORAIL (SFM) Installation Guide. SFM has been classified to the system level fire portion of UL 1703. This UL 1703 classification has been incorporated into the UL 2703 product certification. SFM has achieved Class A, B & C system level performance for steep sloped roofs when used in conjunction with type 1 and type 2 constructions. Class A, B & C system level fire performance is inherent in the SFM design, and no additional mitigation measures are required. The fire classification rating is only valid on roof pitches greater than or equal to 2:12 (slopes ≥ 2 inches per foot, or 9.5 degrees). There is no required minimum or maximum height limitation above the roof deck to maintain the Class A, B & C fire rating for SFM. SUNFRAME MICRORAILTM components shall be mounted over a fire resistant roof covering rated for the application.

UL2703 TEST MODULESSee page "P" for a list of modules that were electrically and mechanically tested or qualified with the SUNFRAME MICRORAIL (SFM) components outlined within this Installation Guide. • Maxium Area of Module = 17.98sqft• UL2703 Design Load Ratings: a) Downward Pressure – 33 PSF b) Upward Pressure – 33 PSF c) Down-Slope Load – 10 PSF• Tested Loads: a) Downward Pressure – 50 PSF / 2400 Pa b) Upward Pressure – 50 PSF / 2400Pa c) Down-Slope Load – 15 PSF / 720 Pa• Maximum Span = 6ft• Use with a maximum over current protection device OCPD of 30A

LABEL MARKINGS• System fire class rating: See installation instructions for installation requirements

to achieve a specified system fire class rating with Unirac .• Unirac SUNFRAME MICRORAILTM is listed to UL 2703.• All splices within a system are shipped with marking indicating date and location

of manufacture.

Module Type System Level Fire Rating Microrail Direction Module Orientation Mitigation Required

Type 1 and Type 2 Class A, B & C East-West Landscape OR Portrait None Required


TESTED / CERTIFIED MODULE LIST P

Module Manufacturer Module Series Model No. (XXX)(XXXW) Part No.Trina TSM-PA05.18 240-260W TSM-xxx PA05.18

TSM -PD05.10/PD05.18 255-265W TSM-xxx PD05.10

N/A 255-265W TSM-xxx PD05.18

Canadian Solar CS6V-M 225, 230 CS6V-XXXM

CS6P-P 250, 255, 260 CS6P-XXXP

CS6K-M 265, 270 CS6K-XXXM

CS5A-M 160-180 CS5A-XXX, CS5A-XXXM

Q-Cells B.LINE PLUS BFR G4.1 262, 277, 292 B.LINE PLUS BFR G4.1 XXX

B.LINE PRO BFR G4.1 247, 262, 277 B.LINE PRO BFR G4.1 XXX

Q.PLUS-G4 270, 275, 280 Q.PLUS-G4 XXX

Q.PLUS BFR G4.1 270-280 Q.PLUS BFR G4.1 XXX

Q.PRO BFR G4.1 260-270 Q.PRO BFR G4.1 XXX

Q.PRO-G4 255, 260, 265 Q.PRO-G4 XXX

Q.PRO BFR G4.3 260,265 Q.PRO BFR G4.3 XXX

Jinko JKM200-265P-60 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265

JKM XXX P-60

JKM200-265PP-60 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265

JKM XXX PP-60

JKM200-280M-60 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275, 280

JKM XXX M-60

Kyocera KU-60 260,265 KUXXX-6MCA

LG MonoX 280, 285, 290 LG XXX S1C-L4

NeON 305, 310, 315, 320 LG XXX N1C-G4

Yingli YGE 270, 265, 260, 255, 250 YL XXX P-29b

JA Solar JAP6 245-265 JAP6 60-XXX/3BB

JAM6 250-270 JAM6-60-XXX/SI

Renesola all 60 cell modules 250, 255, 260 Virtus II

270, 275 156 Series

Suniva MV Series 60 240-255 MVX XXX-60

Optimus 275, 280, 285, 290 OPT XXX-60-4-100

Sunpower E-Series 327, 310 E20-XXX-COM

X-Series 335, 345 X21-XXX

X-Series 360 X22-XXX-C-AC


MODULE MAINTENANCE Q

1. Loosen 9" splice bolts approximately 3 turns. DO NOT REMOVE.

2. Remove bolts and caps from 3" Microrails and attached splices

3. Slide splices away from the module to be removed

4. Lift module and disconnect MLPE cables

5. Remove Module. Reverse steps to replace module removed.

Bonding note: If both sides of array are bonded with NS Bonding Clips, as recommended, then no additional bonding is required for module maintenance.

If necessary, on the row of modules containing the module being removed, one additional bonding clip can be added to the edge of the array opposite of the edge with bonding clips already installed.


CONSIDERATIONS & MAINTENANCE R

ELECTRICAL CONSIDERATIONSSUNFRAME Microrail is intended to be used with PV modules that have a system voltage less than or equal to that allowable by the NEC. A minimum 10AWG, 105°C copper grounding conductor should be used to ground a system, according to the National Electric Code (NEC). It is the installer’s responsibility to check local codes, which may vary.

INTERCONNECTION INFORMATIONThere is no size limit on how many SUNFRAME Microrails & PV modules can be mechanically interconnected for any given configuration, provided that the installation meets the requirements of applicable building and fire codes.

GROUNDING NOTES: The installation must be conducted in accordance with the National Electric Code (NEC) and the authority having jurisdiction. Please refer to these resources in your location for required grounding lug quantities specific to your project. The grounding / bonding components may overhang parts of the array so care must be taken when walking around the array to avoid damage. Conductor fastener torque values depend on conductor size. See product data sheets for correct torque values. This racking system may be used to ground and/or mount a PV module complying with UL 1703 only when the specific module has been evaluated for grounding and/or mounting in compliance with the included instruction

PERIODIC INSPECTION: Conduct periodic inspections for loose components, loose fasteners or any corrosion, immediately replace any affected components.

APPENDIXDESIGN & ENGINEERING GUIDE

Table of ContentsAppendix A ‐ Product Catalog Parts List………………………………………………………………………………………………………………………………………………………………… 54Appdenix B ‐ Prescriptive Pressure Tables………………………………………………………………………………………………………………………………………………………………55Appendix C ‐ Roof Pitch to Angle Conversion………………………………………………………………………………………………………………………………………………………… 75Appendix D ‐ Dead Load Calculation……………………………………………………………………………………………………………………………………………………………………… 76Appendix E ‐ Sample Calculation (ASCE 7‐05)…………………………………………………………………………………………………………………………………………………………77Appendix F ‐ Technical Data Sheets…………………………………………………………………………………………………………………………………………………………………………92

53APPENDIXTABLE OF CONTENTS

20

Product Catalog Parts List

18188888

GROUND WEEBLUG #1ILSCO LAY IN LUG (GBL4DBT)

Box Quantities10101010

SFM ATT SPLICE 9" 46MM DRK

Part

1818

SFM SPLICE 9" 40MM DRKSFM SPLICE 9" 46MM DRK

SFM ATT SPLICE 9" 32MM DRK

20

444444

SFM TRIMRAIL 66" 35MM DRKSFM TRIMRAIL 132" 35MM DRK

Catalog Number230332D

230940D230946D

008002S008009P

Part TypeAssemblyAssemblyAssemblyAssemblyAssembly230132D

230135D230140D230146D230932D230935D

Part

DescriptionSFM MICRORAIL 3" 32MM DRKSFM MICRORAIL 3" 35MM DRK

SFM TRIMRAIL 66" 32MM DRK 44SFM TRIMRAIL 132" 32MM DRK240232D

230335D230340D230346D

54

SFM MICRORAIL 3" 40MM DRKSFM MICRORAIL 3" 46MM DRK

SFM SPLICE 9" 32MM DRKSFM SPLICE 9" 35MM DRKAssembly

AssemblyAssemblyAssemblyAssemblyAssembly

SFM ATT SPLICE 9" 35MM DRKSFM ATT SPLICE 9" 40MM DRK

Assembly

PartPartPartPartPartPartPart

240132D Part

240135D240235D240140D240240D240146D

SFM TRIMRAIL 66" 40MM DRKSFM TRIMRAIL 132" 40MM DRKSFM TRIMRAIL 66" 46MM DRK

SFM TRIMRAIL 132" 46MM DRK

008015S

PartAssembly

PartAssembly

Part

240246D240901M240902D205000S008014M

10101001010

SFM TRIM SPLICE MILLSFM TRIM ROOF ATT ASSY DRKENPHASE ENGAGE CABLE CLIP

MLPE MOUNT ASSYWIRE BND CLIP

APPENDIX APRODUCT CATALOG PARTS LIST PAGE

55APPENDIX BPRESCRIPTIVE PRESSURE TABLES PAGE

Roof Pitch to Angle Conversion

`

75APPENDIX CROOF PITCH TO ANGLE CONVERSION PAGE

Dead Load Calculation

`

The Prescriptive Pressure Tables and U‐Building include service dead loads ranging from 2.1 to 3.8 psf and include the wiehgt of the SFM system and module.

To calculate the dead load of your system, please refer to Appendix H ‐ Technical Data Sheets and the project specific module specification sheet. If your loads fall outside the range listed aboe, please use the Analytical Method in this guide for analysis.

76APPENDIX DDEAD LOAD CALCULATION PAGE

Sample Calculation (ASCE 7-05)

Allentown, NJ

Assume ASCE7-05 for sample calculation

Assume no local amendments for sample calculation4. Determine Occupancy Category utilizing Table 1-1 (pg. 3)

Occupancy Category II

5. Determine Roof Height 10’ - 0” to top of wall & 16’-2” to ridge

6. Determine Roof Angle (degrees)5/12 – 22.62 degrees

7. Determine Basic Wind Speed utilizing Figure 6-1 continued (pg. 33)100 mph

Exposure C

77

1. Obtain Project Location

3. Determine if there are any local amendments to the Current Adopted Building Code (City web page will generally list local amendments)

2. Contact local AHJ (Authority Having Jurisdiction) to determine Current Adopted Building Code (City web page will either list adopted code or list contact information for Building/Engineering Department)

Step 1: User Inputs (ASCE 7-05)

8. Determine Wind Exp. Category utilizing definitions for Surface Roughness Categories found in sections 6.5.6.2 & 6.5.6.3 (pg 25-26)

APPENDIX ESAMPLE CALCULATION (ASCE 7-05) PAGE

9. Determine roof zones utilizing Figure 6-3 (pg. 41)

a = 10% of least horizontal dimension = 24ft x 0.1 = 2.4 ftor

a = 0.4 x h = 0.4 x 10ft = 4 ftwhichever is smaller

but not less than either 4% of least horizontal dimension or 3 ft

10. Determine Ground Snow Load utilizing Figure 7-1 continued (pg. 85)25 psf

0.30 g12. Determine the minimum uniform distributed Live Load utilizing Table 4-1 (continued) (pg. 13)

20 psf13. Confirm User Inputs by utilizing DesignCriteriabyZIP program (output attached)

Wind Speed – 100mph, Ground Snow Load – 25 psf, Ss – 0.29314. Module Manufacturer/Type

TRINA TSM – PA05.08 - 26015. Module Length, Module Width, Module Weight

64.96 in, 37.05 in, 41 lbs

11. Determine the mapped MCE spectral response acceleration at short periods, Ss utilizing figure 22-1 continued (pg. 211)

78APPENDIX ESAMPLE CALCULATION (ASCE 7-05) PAGE

16. Calculate Effective Wind Area:

L = 64.96in/(12in/ft) = 5.41 ftW =37.05in/(12in/ft) = 3.09 ft

Area = (5.41ft x 3.09ft)/4 = 4.18 ft 2

17. Per section 6.5.12.4 (pg. 28), determine External Pressure Coefficients, GCpp and GCpn utilizing Figure 6-11C (pg. 57)

Zone 1: GCpp = -0.9GCpn = 0.5

Zone 2:GCpp = -1.7GCpn = 0.5

Zone 3: GCpp = -2.6GCpn = 0.5

18. Determine Velocity Pressure Coefficient, Kz utilizing Table 6-3 (pg. 79)

79

Step 2: Wind Pressure (ASCE 7-05, Chapter 6)

0.85


19. Determine Topographic Factor, Kzt utilizing Figure 6-4 (cont’d) (pg. 46)1

20. Determine Directionality Factor, Kd utilizing Table 6-4 (pg. 80)

21. Determine Wind Importance Factor utilizing Table 6-1 (pg. 77)1

22. Calculate Velocity Pressure, qz = qh utilizing equation (6-15) in section 6.5.10 (pg. 27)

23. Calculate Design Wind Pressures, Pp(positive) and Pn(negative) utilizing equation (6-22) in section 6.5.12.4.1 (pg. 28)

Zone 1:Pp = qh(GCpn) = 18.5(0.5) = 9.25 psf = 10 psf minPn = qh(GCpp) = 18.5(-0.9) = -16.7 psf

Zone 2: Pp = qh(GCpn) = 18.5(0.5) = 9.25 psf = 10 psf minPn = qh(GCpp) = 18.5(-1.7) = -31.5 psf

Zone 3:Pp = qh(GCpn) = 18.5(0.5) = 9.25 psf = 10 psf minPn = qh(GCpp) = 18.5(-2.6) = -48.1 psf

80

0.85

qh = 0.00256KzKztKdV2Iw = 0.00256(0.85)(1.0)(0.85)(100)2(1.0) = 18.5 psf


24. Determine Racking System Dead Load (See Appendix D)Min = 2.14 psfMax = 3.85 psf

25. Ground Snow Load, pg from Step 125 psf

26. Determine Exposure Factor, Ce utilizing Table 7-2 (pg. 92)1

27. Determine Thermal Factor, Ct utilizing Table 7-3 (pg. 93)1

28. Determine Snow Importance Factor, Is utilizing Table 7-4 (pg. 93)1

29. Calculate Flat Roof Snow Load, pf utilizing equation (7-1) in section 7.3 (pg. 81)

Step 3: Dead Load


pf = 0.7CeCtIpg = 0.7(1.0)(1.0)(1.0)(25) = 17.5 psf


30. Determine Slope Factor, Cs utilizing Figure 7-2a0.729

31. Calculate Sloped Roof Snow Load, ps utilizing equation (7-2) in section 7.4 (pg. 81)

ps = Cspf = (0.729)(17.5) = 12.76 psf

32. Amplification Factor, ap utilizing AC428, section 3.1.3.3 & ASCE 7-05 Table 13.6-1 (pg. 149)1

33. Determine Component Response Modification Factor, Rp utilizing AC428 Table 3.1.3.3 & ASCE 7-05 Table 13.6-1 (pg. 149)1.5

34. Mapped MCE spectral response acceleration at short periods, Ss from Step 10.3

35. Determine Site Coefficient, Fa utilizing Table 11.4-11.56

36. Calculate the MCE Spectral Response Acceleration for Short Periods, SMS utilizing equation (11.4-1) in section 11.4.3 (pg. 115)

37. Calculate the Design Earthquake Spectral Response Acceleration Parameter at Short Periods, SDS utilizing equation (11.4-3) in section 11.4.4 (pg. 115)

SDS = 2/3SMS = (2/3)(0.468) = 0.312

SMS = FaSs = (1.56)(0.3) = 0.468

82

Step 5: Seismic Load (ASCE 7-05, Chapters 12 & 13)


38. From Step 3, Effective Seismic Weight, Wp

3.85 psf39. Determine Seismic Importance Factor, Ip utilizing section 13.1.3 (pg. 143)

140. Determine height in structure of point of attachment of component with respect to the base, z utilizing section 13.3.1 (pg. 145)

15.5 ft41. Determine average roof height of structure, h utilizing section 13.3.1 (pg. 145)

15 ft42. Calculate Horizontal Seismic Design Force, Fph utilizing equation (13.3-1) in section 13.3.1 (pg. 144)

Fph = ((0.4apSDSWp)/(Rp/Ip)) x (1+2(z/h))= ((0.4(1.0)(0.312)(3.85))/(1.5/1.0)) x (1+2(1))= 0.961 psf

is not required to be taken as greater than (13.3-2) Fph = 1.6SDSIpWp

= 1.6(0.312)(1.0)(3.85)= 1.922 psfShall not be taken as less than (13.3-3)

Fph = 0.3 SDSIpWp

= 0.3(0.312)(1.0)(3.85) = 0.360 psf


43. Calculate Vertical Seismic Design Force, Fpv utilizing equation (12.4-4) in section 12.4.2.2 (pg. 126)= 0.2SDSD= 0.2(0.312)(3.85)= 0.240 psf

44. Summarize Calculated Design Forces

Wind: Zone 1 = 10 psf (down) Zone 1 = -16.7 psf (up)

Zone 2 = 10 psf (down)Zone 2 = -31.5 psf (up)

Zone 3 = 10 psf (down)Zone 3 = -48.1 psf (up)

Dead: Min = 2.14 psfMax = 3.85 psf

Snow: 12.76 psf

Seismic: Horizontal = 0.961 psfVertical = 0.241 psf


Vertical Down: Zone 1, 2 & 3 = 10psf

Vertical Up: Zone 1 = -16.7psf, Zone 2 = -31.5psf, Zone 3 = -48.1psfDead:

Vertical Down: Min = 2.14 x cosine (22.62) = 1.98psfMax = 3.85 x cosine (22.62) = 3.55psf

Horizontal: Min = 2.14 x sine (22.62) = 0.82psfMax = 3.85 x sine (22.62) = 1.48psf

Snow:Vertical Down: 12.76 x cosine (22.62) x cosine (22.62) = 10.87psf

Horizontal: 12.76 x sine (22.62) = 4.91psfSeismic:

Vertical Down: 0.241 x cosine (22.62) + 0.961 x sine (22.62) = 0.59pdf

Horizontal: 0.241 x sine (22.62) + 0.961 x cosine (22.62) = 0.98psf

85

45. Calculate Local Horizontal (parallel to module face) and Vertical (perpendicular to module face) Components of Design Forces at 22.62 Degree Roof Tilt

Wind: (Note: wind design forces already take into account roof tilt and represent vertical loading perpendicular to the module surface)


46. Identify Controlling Load Combination for Both Vertical (up and down) and Horizontal Directions

Vertical (psf) Horizontal (psf)Zone 1, Zone 2, Zone 3

1) D 3.55 1.482) D + S 15.3 6.393) D + Wup ‐14.72, ‐29.52, ‐46.12 0.824) D + Wdown 13.6 1.485) D + 0.75Wdown + 0.75S 19.2 5.166) D + 0.75(0.7E) + 0.75S 12.0 5.687) D + 0.7E 3.96 2.178) 0.6D + Wup ‐15.51, ‐30.31, ‐46.92 0.499) 0.6D + Wdown 12.1 0.8910) 0.6D + 0.7E 2.54 1.57


47. Create Initial Array Layout3 x 3 Landscape Array


49. Determine System Application Rules

Pull loads form page 88. Compare to the table on page 26.Roof Zone 1:Down = 19.2 psf Rule 1 controlsUp = ‐15.5 psf Rule 1 controls Since Rule 1 controls; use the following dimensions;Down Slope = 6.4 psf Rule 1 controls Overhang Maximum = 24"Lateral = 0.7 psf Rule 1 controls Span Maximum = 72"

Pull loads form page 88. Compare to the table on page 26.Roof Zone 2:Down = 19.2 psf Rule 1 controlsUp = ‐30.3 psf See noteDown Slope = 6.4 psf Rule 1 controls Overhang Maximum = 18"Lateral = 0.7 psf Rule 1 controls Span Maximum = 48"

Overhang Maximum = 24"Span Maximum = 72"

Pull loads form page 88. Compare to the table on page 26.Roof Zone 3:Down = 19.2 psf Rule 1 controlsUp = ‐46.9 psf See noteDown Slope = 6.4 psf Rule 1 controlsLateral = 0.7 psf Rule 1 controls Overhang Maximum = 10"

Span Maximum = 32"

89

Note: The uplift pressure is greater than those listed in rules 1, 2, & 3 for Both the MicroRail and Trim Rail dimensions.

(MicroRail and Trim Rail dimensions in roof zone 1)

(MicroRail dimensions in roof zone 2)

(Trim Rail dimensions in roof zone 2)

(MicroRail and Trim Rail dimensions)

Note: Rule 3 controls for the MicroRail dimensions And Rule 1 controls for Trim Rail dimensions.


50. Locate Array and Support Locations Based on System Application and Layout Rules


51. Calculate Maximum Point Load for Each Support Type (Area of 1 Panel = 16.71sf)

52. Corner Support (1/4 Panel Tributary Area)

· Maximum Downward Point Load Acting Perpendicular to the Roof Surface: 19.2psf x (.25 x 16.71) = 80 lbs· Maximum Upward Point Load Acting Perpendicular to the roof surface (Zone 1): -15.5psf x (.25 x 16.71) = -65 lbs· Maximum Shear Point Load Acting Parallel to the roof surface: 6.4psf x (.25 x 16.71) = 27 lbs53. Edge Support (1/2 Panel Tributary Area)

· Maximum Downward Point Load Acting Perpendicular to the Roof Surface: 19.2psf x (.50 x 16.71) = 160 lbs· Maximum Upward Point Load Acting Perpendicular to the roof surface (Zone 1): -15.5psf x (.50 x 16.71) = -130 lbs· Maximum Shear Point Load Acting Parallel to the roof surface: 6.4psf x (.50 x 16.71) = 53 lbs

54. Interior Support (1 Panel Tributary Area)

· Maximum Downward Point Load Acting Perpendicular to the Roof Surface: 19.2psf x (1 x 16.71) = 321 lbs· Maximum Upward Point Load Acting Perpendicular to the roof surface (Zone 1): -15.5psf x (1x 16.71) = -259 lbs· Maximum Shear Point Load Acting Parallel to the roof surface: 6.4psf x (1x 16.71) = 107 lbs


●

●

●

Assembly Part Numbers: 230332D, 230335D, 230340D, 230346D

Extruded Components material:

Ultimate Tensile: 38ksi

Yield: 35ksi

Finish: Dark Anodized

Weight (40mm assembly): 1.213 lbs (550g)

No Intersection 2 Modules Vertical(See System Layout Rules - Connection/Attachment Rules 1 & X) (See System Layout Rules - Connection/Attachment Rule 2v & X)

6005A-T61, 6061-T6

Direction Allowable Loads (lbs) Design Loads (lbs)

X +/‐ LateralY + Tension

DirectionX +/‐ SlidingY + TensionY ‐ CompressionZ +/‐ Transverse

387

Z + Down SlopeY ‐ Compression

57 865851853175 871

Allowable Loads (lbs)

57499991576

Design Loads (lbs)

8675514981225

115

92

SUNFRAME MicroRail - 3" AssemblyAllowable and design loads are valid when components are assembled according to authorized UNIRAC documents.

Values represent the allowable and design load capacity of a single 3" MicroRail assembly to retain a module(s) in the direction indicated

Resistance factors and safety factors are determined according to Part 1 Appendix 1 of the 2010 Aluminum Design Manual

APPENDIX FTECHNICAL DATA SHEET PAGE

●

●

●




Yield: 35ksi



2 Modules (North Row) 4 Modules Max (Interior Row)(See System Layout Rules - Connection/Attachment Rule 5) (See System Layout Rules - Connection/Attachment Rule 5)

6005A-T61, 6061-T6

Allowable and design loads are valid when components are assembled according to authorized UNIRAC documents.

Values represent the allowable and design load capacity of a single 9" MicroRail assembly to retain a module(s) in the direction indicated


Y + Tension 525 793Y ‐ Compression 1740 2632 2188

Z +/‐ Transverse 270 408

Design Loads (lbs)

X +/‐ Sliding 163 246Y + Tension 516 781

Allowable Loads (lbs)

Y ‐ CompressionZ + Down Slope 232 350

DirectionAllowable Loads (lbs) Design Loads (lbs)

X +/‐ Lateral 163 246

SUNFRAME MicroRail - 9" Assembly

Direction

93

1447

PAGEAPPENDIX F

TECHNICAL DATA SHEET

●

●

●




Yield: 35ksi



2 Modules (North Row) 4 Modules Max (Interior Row)(See System Layout Rules - Connection/Attachment Rule 2h) (See System Layout Rules - Connection/Attachment Rule 3 & 4)

6005A-T61, 6061-T6

951Z + Down Slope n/a n/a Z +/‐ Transverse n/a n/aY ‐ Compression 284 430 Y ‐ Compression 629Y + Tension 213 322 Y + Tension 641 969X +/‐ Lateral n/a n/a X +/‐ Sliding n/a

Values represent the allowable and design load capacity of a single 9" MicroRail Splice to retain a module(s) in the direction indicated


Direction Allowable Loads (lbs) Design Loads (lbs) Direction Allowable Loads (lbs) Design Loads (lbs)

n/a

Allowable and design loads are valid when components are assembled according to authorized UNIRAC documents.SUNFRAME MicroRail - 9" Splice Assembly

94PAGE

APPENDIX FTECHNICAL DATA SHEET

●

●

●

Trim Rail Part Numbers: 240132D, 240232D, 240135D, 240235D

240140D, 240240D, 240146D, 240246D

Extruded Components material: 6005A-T61, 6061-T6

Ultimate Tensile/Yield: 38ksi/35ksi


Weight (40mm part): 1.330 lbs/ft (604 g/ft)

Trim SplicePart Number: 240901M

Trim Roof Attachment AssemblyPart Number: 240902D

Load Testing Results

Y ‐ Compression

503

Allowable and design loads are valid when components are assembled according to authorized UNIRAC documents.

Values represent the allowable and design load capacity of a single L-Foot capture connection to retain a module(s) in the direction indicated


DirectionAverage

Ultimate (lbs)AllowableLoad (lbs)

Z + Down SlopeY + Tension 1739

1536

194730582

2.60

SUNFRAME MicroRail - Trim Rail

2.382.64

2931105881

Safety Factor,FS

Design Load(lbs)

ResistanceFactor, Φ

95

0.5820.6350.573

PAGEAPPENDIX F

TECHNICAL DATA SHEET

sfm design & engineering guide

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