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Elements and Performance Criteria

  1. Determine job requirements
  2. Prepare and select circuit protection controls and devices for electrical installations
  3. Install circuit protection controls and devices for electrical installations

Range Statement

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.

Installations include:

at least one (1) general electrical installation comprising a main switchboard, supplying more than one circuit each for lighting, socket outlets and fixed appliances

at least one (1) industrial electrical installation comprising a distribution board separate from the main switchboard and at least one (1) circuit supplying a three-phase load and safety system in one of the following industrial environments:

factory

building

off shore platform

mine site processing

oil and gas installation

processing plant

workshop

underground installation

three-phase loads include at least one (1) or more of the following:

motors – for pumps, conveyors, mills, agitators, crushers and screening plants

heaters

compressor packages

heating, ventilation and air conditioning (HVAC) units

facility accommodation units, sea container workshops and storage units, and laboratories

workshop equipment, including lathes, milling machines and welders

underground dewatering systems and ‘gate end’ boxes for drilling equipment

Regulatory requirements include:

AS/NZS 3000:2007 Electrical installations (known as the Australian/New Zealand Wiring Rules)

AS/NZS 3012:2010 Electrical installations – Construction and demolition sites

Safe working practices include:

demonstration of safe working practices and installation in accordance with industry established safe and sound practices


Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria on at least two (2) occasions and include:

following work instructions, standard operating procedures (SOPs) and safe work practices

identifying and interpreting circuits, drawings, plans and specifications relevant to the work to be undertaken

determining the individual load requirements of the installation

selecting the appropriate switchboard and layout arrangements

complying with Australian/New Zealand Wiring Rules, other Australian Standards, e.g. AS/NZS 3008.1.1:2009 Electrical Installations – Selection of cables – Cables for alternating voltages up to and including 0.6/1 kV – typical Australian installation conditions, Service Rules and other relevant standards when selecting circuit protection controls and devices in regard to the following aspects:

protection against indirect contact, overcurrent or excess earth leakage current conditions and over and under voltage by selecting and installing using safe working practices:

a fuse/s for fault current limiting protection

an appropriate circuit breaker/s with a current rating not less than the maximum demand of the portion of the electrical installation they control

a residual current device (RCD) with a maximum rated residual current of 30 mA

control of the electrical installation (or parts thereof) by suitable switching arrangements by selecting and installing using safe working practices:

a main switch/es to control the whole of the electrical installation

switches for isolation, emergency, mechanical maintenance and functional (control) with appropriate Ingress Protection (IP) rating

installing and terminating the compliant earthing system components for the multiple earthed neutral (MEN) system and other earthing arrangements

terminating all circuit protection controls and devices

inspect visually all components and earthing system to ensure compliance

test earthing system for continuity and insulation resistance

identify with marking all switches, circuit breakers and RCDs and other electrical equipment on or adjacent to the switchboard

using test equipment to locate faults, completing remedial action and retesting to ensure compliance

documenting reasons for selection and installation arrangement requirements in accordance with SOPs.


Knowledge Evidence

Evidence required to demonstrate the required knowledge for this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include knowledge of:

safe work practices and procedures and use of personal protective equipment (PPE)

Australian/New Zealand Wiring Rules and other related standards in regards to the following:

requirements for the selection and installation of switchgear and controlgear, including:

protection against indirect contact

protection against over current or excess earth leakage current conditions

protection against over voltage and under voltage

control of the electrical installation (or parts thereof) by suitable switching arrangements

design, selection (including form type) and installation of switchboards

design of an electrical installation

design, selection (including form type) and installation of switchboards

application and segregation requirements of separated extra-low voltage (SELV) and protected extra-low voltage (PELV) circuits, including earthing requirements and testing

application and arrangement of an isolated supply

hazards and risks in an electrical installation

protection against indirect contact, including:

methods of protection

protection by automatic disconnection of supply

touch-voltage limits

earthing system impedance

disconnection times

supplementary equipotential bonding

protection by the use of Class II equipment or by equivalent insulation

protection by electrical separation

protection by the use of RCDs

protection against thermal effects in normal service

protection against unwanted voltages

protection against over current and fault currents

protection against over voltage

protection against injury from mechanical movement

devices for isolation

fire integrity

protection from damp situations

earthing system terms, parts and arrangement

devices and operating principles for automatic disconnection of supply, including circuit breakers, fuse and RCDs

devices for isolation and switching, including for the following functions:

isolation

emergency

mechanical maintenance

functional (control)

switchboards and distribution boards purpose, types, application, layout and compliance requirements

bonding of metallic meter enclosures

minimum fault levels specified by electricity network operator

methods for determining prospective fault current

MEN arrangement, resultant fault current path and magnitude, operation of protective devices and implication of MEN link absence during fault conditions

knowledge of alternate earthing systems when required by local Regulatory Authorities, e.g. TT low voltage supply earthing system in dairy sheds in New Zealand

construction and demolition requirements as per AS/NZS 3012:2010 Electrical Installations – Construction and demolition sites.