Unit of competency Outline

Date retreived
23/07/2026 11:40 AM AWST

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Select circuit protection devices by type and rating, fit to switchboards and install earthing

Select circuit protection devices by type and rating, fit to switchboards and install earthing

Unit of competency
National Code
MEM10019
State Code
AUX46
TGA Status
Current
DTWD Status
Approved
Current Release Number
3.00
Current Release Date
26/06/2019
View on TGA
State Implementation and Classification
Approved Date
16/10/2015
Field of Education
031313 - Electrical Fitting, Electrical Mechanics
Original Release Date
16/10/2015
Nominal Hours
36
Description
This unit of competency has been developed for Engineering Tradesperson -industrial electrician apprenticeship training and the recognition of trade-level skills in selecting and installing circuit protection devices to protect against electric shock, over current and over voltage for operating voltages up to 1000 V alternating current (AC) or 1500 V direct current (DC) and install earthing as per multiple earthed neutral (MEN) system. It covers a comprehensive understanding of earthing arrangements, the MEN system (including sub-installations), the calculation and selection of protective devices, alternative arrangement against electric shock and the requirements for use of residual current devices (RCDs).This unit covers the skills and knowledge required to meet the Electrical Regulatory Authorities Council (ERAC).Essential Performance Capabilities (EPCs) classified as ‘critical’: EPC 16 - Demonstrate and apply in practice the requirements of AS/NZS 3000 in relation to earthing arrangements and fault-loop impedance calculations. Knowledge of alternate earthing systems when required by local Regulatory Authorities. EPC 17 - Demonstrate a comprehensive knowledge and understanding of the MEN system and its application, including on sub-installations. Demonstrate how to test an MEN system.EPC 27 - Describe and apply in practice the requirements for circuit protection using AS/NZS 3000:2000 and other relevant Australian Standards, e.g. AS/NZS 3018.1.EPC 20 - Demonstrate knowledge of the SELV and PELV systems, their application and testing in accordance with AS/NZS 3000.EPC 23 - Describe and apply the control and protection requirements for installations and equipment. Demonstrate the ability to select suitable equipment and switchgear for a particular installation or part of an installation using AS/NZS 3000.EPC 24 - Demonstrate an understanding of the AS/NZS 3000 and regulatory requirements for the location of switchboards and the arrangement of switchboard equipment in installations. Methods for determining prospective fault current. Switchboard form types.EPC 26 - Demonstrate the appropriate methods for the installation, modification and testing of electrical installations and equipment for construction and demolition sites, complying with AS/NZS 3012 and applicable workplace safety legislation. Need for calibration of instruments.Some jurisdictions require the holder of this unit to be licensed or certified and users should check with the relevant authorities.Band: AUnit Weight: 2
Notes
Elements and Performance Criteria
1. Determine job requirements
  • 1.1 Follow standard operating procedures (SOPs)
  • 1.2 Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures
  • 1.3 Use appropriate personal protective equipment (PPE) in accordance with SOPs
  • 1.4 Identify job and load requirements from specifications, drawings, job sheets or work instructions
2. Prepare and select circuit protection controls and devices for electrical installations
  • 2.1 Organise circuits and switchboard equipment to comply with layout drawings, specifications and regulatory requirements
  • 2.2 Select suitable circuit protective devices to meet specifications
  • 2.3 Select RCDs to meet required circuit requirements and specifications
  • 2.4 Select switchgear/control gear by type, rating and purpose for a particular installation or part of an installation
3. Install circuit protection controls and devices for electrical installations
  • 3.1 Isolate and tag circuits and equipment in accordance with procedures, where required
  • 3.2 Install circuit protection devices in compliance with job specifications and requirements
  • 3.3 Install RCDs, where required, to protect all lighting and socket outlets in final subcircuits in domestic electrical installations
  • 3.4 Install switchgear (including main switch/s) and control gear according to manufacturer and regulatory requirements
  • 3.5 Check installed components are straight and square in the required locations and within acceptable tolerances
  • 3.6 Terminate earthing to meet with the MEN system requirements
  • 3.7 Inspect installed components and earthing system visually to ensure compliance
  • 3.8 Test the earthing system for continuity and insulation resistance to ensure compliance
  • 3.9 Mark all switches, circuit-breakers, RCDs and other electrical equipment on or adjacent to the switchboard
  • 3.10 Document selection of circuit protection devices and electrical installation arrangement in accordance with SOPs
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