This unit involves the skills and knowledge required to select wiring systems and cables for electrical installations operating at voltages up to 1,000 volt (V) alternating current (a.c.) or 1,500 V direct current (d.c.).
It includes application of wiring systems and cable types, selecting wiring system compatible with the installation conditions, selecting cables that comply with required current-carrying capacity and voltage drop and earth fault-loop impedance limitations, coordinating between protective devices and conductors, and documenting selection decisions.
The skills and knowledge described in this unit require a licence or permit to practice in the workplace where work is carried out on electrical installations which are designed to operate at voltages greater than 50 V a.c. or 120 V d.c.
Assessment tasks will be designed to reinforce & extend knowledge and skill competence within set & controlled parameters in accordance with each unit’s learning outcomes & 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:
*applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices, including using of risk control measures
*applying sustainable energy principles and practices
*calculating the expected voltage drop in a given circuit
*calculating the expected fault-loop impedance for a given circuit arrangement
*selecting cables to satisfy voltage-drop requirements in addition to current-carrying capacity requirements
*selecting cables to satisfy fault-loop impedance requirements in addition to current-carrying capacity requirements and voltage drop requirements
*selecting conductor size based on the maximum current requirement for a given installation condition
*determining the extent and nature of the installation for job specifications, cable routes, the route lengths of cables and the conditions in which the wiring system is to operate, the number and types of circuits required for a particular installation, current requirements for given final sub-circuits, layout/schedule of circuits for given installations
*selecting wiring system suitable for the installation environment, cables, including voltage-drop, fault-loop impedance and minimum conductor size to satisfy current-carrying capacity, compliant earthing system components
*dealing with unplanned events in accordance with workplace procedures in a manner that minimises risk to personnel, equipment
*determining maximum demand for consumer mains and sub-mains final sub-circuits for an installation with industry and regulatory standards
*determining maximum demand for final sub-circuits for an installation in accordance with industry and regulatory standards
*documenting electrical installation design
*identifying and applying installation requirements for switchboards in accordance with industry and regulatory requirements
*identifying layout/schedule of circuits for low voltage (LV) electrical installation
*arranging installation loads onto separate circuits
*identifying performance requirements for an electrical installation to comply with safety and regulatory requirements
*selecting cables for consumer mains, sub-mains and [Begin added text]to meet maximum demand and installation conditions, including any derating factors
*selecting cables for final sub-circuits to meet maximum demand and installation conditions, including any derating factors
*determining suitability of the cable insulation
*selecting circuit protection devices to satisfy maximum demand and coordination in accordance with industry and regulatory requirements
*selecting circuit protection devices to satisfy requirements for [Begin removed text]coordination,[End removed text] discrimination, fault protection and overcurrent
*selecting control and isolation devices to satisfy AS/NZS 3000 requirements for a range of loads and environmental conditions
*selecting isolation and control devices as required by the designed installation and in accordance with industry and regulatory requirements
*applying the requirements of the relevant industry standards, including AS/NZS 3000, to all work tasks.
The qualified trainer and assessor will advise students of class notes, reading materials produced by VU Polytechnic and further support via VU Polytechnic e-learning system and/or in person.
This unit is studied as part of the following course(s):