UEEEL0018 - Select wiring systems and select cables for low voltage electrical installations

Unit code:UEEEL0018Study level:TAFE

Nominal hours

Location

Sunshine

Prerequisites

UEECD0007 - Apply work health and safety regulations, codes and practices in the workplace
UEECD0019 - Fabricate, assemble and dismantle utilities industry components
UEECD0020 - Fix and secure electrotechnology equipment
UEECD0051 - Use drawings, diagrams, schedules, standards, codes and specifications
UEEEL0003 - Arrange circuits, control and protection for electrical installations
UEEEL0008 - Evaluate and modify low voltage heating equipment and controls
UEEEL0009 - Evaluate and modify low voltage lighting circuits, equipment and controls
UEEEL0010 - Evaluate and modify low voltage socket outlets circuits
UEEEL0019 - Solve problems in direct current (d.c.) machines
UEEEL0020 - Solve problems in low voltage a.c. circuits
UEEEL0021 - Solve problems in magnetic and electromagnetic devices
UEEEL0023 - Terminate cables, cords and accessories for low voltage circuits
UEEEL0024 - Test and connect alternating current (a.c.) rotating machines
UEEEL0025 - Test and connect transformers
UEECD0044 - Solve problems in multiple path circuits
UEECD0046 - Solve problems in single path circuits
(Or equivalent to be determined by unit coordinator)
Co-requisites
(Corequisite units must be studied concurrently with this unit)

Overview

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

For Melbourne campuses

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.

Students will also be expected to demonstrate the following knowledge:
*design and safety performance requirements, including:
*harmful effects against which the electrical installation design must provide protection
*electrical installation performance standards
*supply characteristic considerations when designing an electrical installation
*methods to determine maximum demand in consumer mains, sub-mains and final subcircuits
*reason for dividing electrical installations into circuits and the factors that determine their number and type
*external factors that may damage an electrical installation
*methods for protecting persons and livestock against direct and indirect contact with conductive parts and the typical application of each
*methods to protect against risk of ignition of flammable materials and injury by burns from the thermal effects of current in normal service
*likely sources of unwanted voltages and the methods for dealing with this potential hazard
*methods for protecting persons and livestock against injury and property against damage from the effects of overcurrent
*requirements for protection against fault current
*requirements for protection against the harmful effects of faults between live parts of circuits supplied at different voltages
*need for protection against injury from mechanical movement and how this may be achieved
*features of 'fire rated construction' and how the integrity of the fire rating can be maintained in relation to electrical installation
*final sub-circuit arrangements including:
*considerations when determining the number and type of circuits for an installation
*daily and seasonal demand for lighting, power, heating and other loads in an installation
*number and types of circuits required for a particular installation
*current requirements for given final sub-circuits
*layout/schedule of circuits for given installations
*factors effecting the suitability of wiring systems, including:
*wiring systems used for particular construction methods and environments
*installation conditions that may affect the current-carrying capacity of cables
*external influences that may affect the current-carrying capacity and/or may cause damage to the wiring system
*AS/NZS 3000 requirements for selecting wiring systems for a range of circuits, installation conditions and construction methods into which the wiring system is to be installed.
Note: Wiring systems include cable enclosures, underground wiring, aerial wiring, catenary support, emergency systems, busbar trunking and earth sheath return

*maximum demand on consumer mains/sub-mains, including:

methods for determining the maximum demand on an installation's consumer mains and sub-mains
maximum demand for the consumer mains for given installations up to 400 ampere (A) per phase
maximum demand for given sub-mains
*cable selection based on current-carrying capacity requirements, including:
installation conditions for a range of wiring systems and applications
external influences that require the use of a derating factor

suitability of the cable insulation
*AS/NZS 3000 requirements for coordination of cables and protection devices
*AS/NZS 3008 Electrical installations - Selection of cables, used to select conductor size based on the maximum current requirement for a given installation condition, including any applicable derating factors
*cable selection based on voltage-drop requirements including:
*AS/NZS 3000 requirements for maximum voltage-drop in an installation
*relevant tables in AS/NZS 3008 Electrical installations - Selection of cables, for unit values of voltage-drop
*cable selection based on fault-loop impedance requirements, including:
*AS/NZS 3000 requirements for maximum fault-loop impedance in an installation
*relevant tables in AS/NZS 3008 Electrical installations - Selection of cables, to determine cable impedances
*selecting protection devices, including:
*acceptable methods of protection against indirect contact
*AS/NZS 3000 requirements for selecting methods and devices to protect against indirect contact for a range of installation types and conditions
*coordination between conductors and protection devices to ensure the protection of cables from overheating due to overcurrent
*possible injuries to persons and livestock from hazards due to a short circuit
*AS/NZS 3000 requirements for selecting devices to protect against overload current for a range of circuits and loads
*AS/NZS 3000 requirements for selecting devices to protect against short circuit current for a range of installation conditions
*selecting devices for isolation and switching, including:

requirements for the provision of the isolation of every circuit in an electrical installation
need for protection against mechanical movement of electrically activated equipment

AS/NZS 3000 requirements for selecting devices for isolation and switching for a range of installations and conditions
*Switchboards, including:

AS/NZS 3000 and local supply authority requirements for switchboards
tariff structures for the supply of electricity
equipment installed at the main switchboards with capacities up to 400 A per phase
*layout of a main switchboard for an installation supplied with:
single phase single tariff whole current metering
single phase multiple tariff whole current metering
multi-phase single tariff whole current metering
multi-phase multiple tariff whole current metering
layout of a main switchboard for a multiple tenancy installation with whole current metering
layout of a main switchboard, including metering, for an installation supplied with three phase current transformer metering
local supply authority requirements for connection of an electrical installation to electrical supply system
relevant manufacturer specifications

Required reading

The qualified trainer and assessor will provide teaching and learning materials as required in the form of workbooks produced by Victoria University and/or via the Victoria University e-learning system.