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UTENES707BA Design electrical installations in hazardousareas

Unit Descriptor Design electrical installations for hazardous areas within the scope of:selecting and locating explosion-protected equipment and wiringsystems and other items that may influence the explosion-protectiontechnique/s; area classifications given in hazardous area layout

drawings or area classification and zonings from similar situationspreviously classified, such as those given in standards.

This unit aligns to the Competency Standard 'Electrical equipment inhazardous areas' CS-EEHA-001-1998, unit NEE 610.

Unit Sector No sector assigned

ELEMENT PERFORMANCE CRITERIA

1. Verify hazardous

classification for the area

1.1 Nature and characteristics of explosion hazards in the

area are identified from plant specifications1.2 In the absence of classification documentation,

arrangements are made to ensure the explosion hazard inthe area is assessed and the area classified

1.3 Classification, extent of zoningsof the area, gas groupsand temperature classare verified by reference toclassification documents or determined from standardsinwhich the explosion hazard, area classificationandzoningsare clearly identified

1.4 Area classificationdetermined from standardsin which theexplosion hazard, area classificationand zoningsare

clearly identified is documented in accordance withrequirements

2. Select and checkequipment, wiring andaccessories

2.1 Equipment and accessories are selected to area activitiesand comply with explosion-protectionrequirements

2.2 Wiring systems are selected to suit area activities, andcomply with explosion-protection, load anddutyrequirements

2.3 Equipment compliance certification is checked forsuitability for the area classificationand zonings

2.4 Cables and accessories are checked for suitability for the

area classificationand zoningsand load and dutyrequirements

3. Document design 3.1 Design and specifications are documented in accordancewith established proceduresand requirements

3.2 Arrangements are made to file design documentation inhazardous arearecords in accordance with establishedproceduresand requirements

ZZZ00 Dummy Training Package Date this PDF was generated: 03 November 2011

UTENES707BA Design electrical installations in hazardous areas

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Commonwealth of Australia, To be reviewed by: TBA

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RANGE STATEMENT

Generic items in this unit are shown in italics, e.g. established procedures. The definition and scopecovered by generic items is described in the Glossary that forms an integral part of this rangestatement.

Endorsements Competency can be demonstrated in relation of the to anyclassified hazardous areas listed:

(T) Mixed explosion-protection techniques Ex mixed

(U) Pressurised enclosure Ex p

(V) Dust-exclusion ignition-proof DIP

(W) Non-sparking Ex n

(X) Intrinsic safety Ex i

(Y) Increased safety equipment Ex e

(Z) Flameproof enclosure Ex d

Currency in unit ofcompetency

In order to maintain currency in this unit on-going competencydevelopment is to occur. This would include keeping abreast ofany changes in legislation, regulations, procedures, technologyand the like related to the scope and application of this unit.



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EVIDENCE GUIDE

This Evidence guide is intended to include components defined within the Range Statement, of whichthe Glossary is an integral part. Terms in italics, e.g. consistent performance, with respect to theEvidence guide are also contained in the Glossary.

Critical aspects ofevidence Achieving competenceAchievement of this unit of competency is based on each of thefollowing conditions being met:

demonstrating consistent performancefor each elementof the unit.

meeting the performance criteria associated with eachelement of competence by employing the techniques,procedures, information and resources available in theworkplace.

demonstrating an understanding of the underpinning

knowledge and skills identified in the section, of this unittitled 'Underpinning knowledge'.

Competency must be demonstrated in relation to theexplosion-protection technique for which competency issought. It is essential that the following aspects of competencybe demonstrated:

interpreting area classification documentation; classifying area from standards; documenting area classification; selecting equipment for a given classified area; selecting wiring systems for a given classified area; checking equipment certification for suitability for a given

classified area.

Reporting requirements

The reporting of the judgements about competence must be inthe context of the individual unit being assessed and thequalification to be issued. Regulatory requirements in individual

jurisdictions may require recording of additional information.Recognition of knowledge and skills transfer may be

maximised by recording and issuing transcripts coveringadditional information. This could be detailed statements aboutthe achievement of knowledge and skills. Any additionalreporting is a matter for negotiation between the RTO and itsclients.

Maintaining competence

Consideration should be given to periodic evaluations of skillsand knowledge within this unit that are critical to safety,operation of plant and equipment and the like, particularlywhere relevant skills and knowledge are not frequently

practiced.



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Context of assessment Competency will be determined on evidence of havingconsistently performedacross a representativerangeof plant,equipment, tools , accessories, componentsand the like for thecategoryundertaken within a unit of competency;autonomously and to requirements. Equivalent evidence fromother sources is also acceptable.

Interdependentassessment of units

Competency in this unit should be assessed only aftercompetency relating to the designing of electrical installationshas been achieved at AQFCertificate III level. Similarcompetency and qualifications related to instrument andelectronic installations would be sufficient pre-requisite whereexplosion-protected equipment operates at extra-low voltage.



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Underpinning knowledge Evidence of knowledge related to hazardous areas and to Exmixed, Ex p, DIP, Ex n, Ex i, Ex e and Ex d and any othertechnique relevant to a particular workplace is required. Thefollowing is a summary of knowledge related to hazardousareas:

Safe working requirements and procedures; definition of ahazardous area; conditions that lead to an explosion; meaningof the terms "combustion", "detonation" and "propagation";OH&S responsibilities; parties responsible for safety ofhazardous areas; definition of classes and zones; identifyclasses, zones and groups from system design documentation;processes for classifying a hazardous area based on specificoccupancy standards; interpretation of hazardous areaclassification documentation; characteristics of an explosiveatmosphere (LEL/UEL) and relationship to ignition energy;combustible properties of materials.

The following is a summary of knowledge ofexplosion-protected equipment and applicable to anexplosion-protection technique:

Method of explosion protection; mechanisms of explosionprotection employed by a technique; interpretation ofinstallation limitations specified in certification and approvaldocumentation; requirements of electrical protection devices;equipment - application; limitations; identification of gasgrouping and temperature class of equipment; temperaturelimitations of wiring and equipment; limitations on non-metallic

and specific alloy enclosures; interpretation of equipmentmarking; application, selection and use of fasteners;requirements for testing circuits; requirements for initialinspection of installations; standards for terminating andconnecting cables; standards and requirements for theinstallation of equipment and wiring; purpose, selection andapplication of sealing compounds; actions and conditions thatwill void explosion-protection; standards for of wiring systemsin hazardous areas; requirements for establishing andmaintaining hazardous area records (site dossier);

arrangements for approval for use of equipment in a hazardousarea; requirements and processes for selecting equipment;requirements and processes for selecting wiring systems andcables; purpose and arrangement for certifyingexplosion-protected equipment



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