This unit covers the explosion-protection aspects of designing electrical power, control and instrumentation systems and installations. It requires the ability to establish design briefs and to pursue economical and effective design solutions.  This unit is directly equivalent to the Unit 2.18 Design explosion-protected electrical systems and installations in the Australian/New Zealand Standard AS/NZS 4761.1 Competencies for working with electrical equipment for hazardous areas (EEHA) Part 1: Competency Standards. Equivalence includes endorsement in the explosion-protection techniques listed in the Range statement of this unit.

Unit details

Study level:
Vocational and further education (TAFE)
Unit code:


A student must have confirmed competency in designing electrical systems and installations at AQF level 6 or equivalent as a pre-requisite to this unit.


Assessment tasks will be designed to reinforce and extend knowledge and skill competence within set and controlled parameters in accordance with each unit's learning outcomes and performance criteria requirements, including the setting of work based practical application tasks designed to provide evidence of competence outcomes, within periodic and scheduled timelines. Students will be expected to demonstrate the following required skills and knowledge: - occupational health and safety responsibilities related to hazardous areas; - the roles of the parties involved in the safety of hazardous areas; - properties of combustible substances and their potential to create an explosive hazard; - the nature of hazardous areas; - explosion-protection equipment - ex certification schemes; - flameproof (ex 'd') explosion-protection technique; - increased safety (ex 'e') explosion-protection technique; - non-sparking (ex 'n') explosion-protection technique; - intrinsic safety (ex 'i') explosion-protection technique; - pressurization (ex 'p') explosion-protection technique; - enclosures for dusts (ex 'td') - explosion-protection technique; - common characteristics of explosion-protection techniques; - preparation to install and maintain explosion-protected equipment in hazardous areas; - the relationship between explosion-protected equipment, their certification documents and required locations given in specifications and layout drawings and/or written instructions; - installation standards and requirements applicable to hazardous; - interpretation of documents showing the classification of a hazardous area; - selecting and checking equipment, wiring and accessories; - documentation of hazardous area installation design; - process for establishing a design brief for an explosion-protected electrical system; - system design, and; - design documentation required for a hazardous area.

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