UEEEL0003 - Arrange circuits, control and protection for electrical installations

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:
*determining the extent and nature of the installation from job specifications
*arranging the control and protection for electrical installations with and without safety services
*arranging, testing and terminating a multiple earthed neutral (MEN) earthing system
*applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices
*applying safety principles for electrical systems in buildings and premises
*applying sustainable energy principles and practices
*calculating prospective fault current in accordance with minimum fault levels specified by local supply authority
*calculating earth fault-loop impedance
*dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
*determining requirements for discrimination and back-up protection for coordination of protection devices
*determining individual load requirements
*arranging and terminating circuits, control and protective devices to comply with requirements
*selecting circuit protective devices and residual current devices (RCDs) that comply with all requirements
*selecting minimum size-earthing conductors in accordance with relevant industry standards
*selecting circuit breakers to operate when installation is in island mode
*selecting RCDs/residual-current circuit breaker with overcurrent protection (RCBO) to operate when installation is in island mode
*drawing arrangements of 2-pole RCDs, 4-pole RCDs and combination RCDs
*obtaining evidence of compliance for the equipment selected
*dividing installation into circuits
*selecting equipment for damp situations
*coordination of protection devices and circuit wiring
*selecting overcurrent protection devices, circuit breakers and RCDs/RCBOs selecting fuses, emergency controls, isolation devices, functional controls and shutdown devices
*selecting a device for fault current limiting protection
*documenting installation arrangement, specification for items selected and reasons for the selections made.

Students will also be expected to demonstrate the following knowledge:
*AS/NZS 3000 safety principles and deemed to comply requirements including:
*definition of terms
*direct contact with live parts
*indirect contact with live parts
*thermal effects of current
*overcurrent
*earth faults
*abnormal voltages
*spread of fire
*mechanical injury
*external influences
*fundamental principles of; installation design; selection and installation of equipment; means of compliance (including alterations, additions and repairs), and verification of compliance
*methods and devices that comply with industry standards for providing protection against indirect contact
*requirements for installation design and selection of equipment, including:
*compliant protection arrangements
*correct functioning
*compatibility with supply
*arrangement of circuits
*circuit and control arrangements, including:
*reason for dividing electrical installations into circuits
*factors to be considered in determining the number and type of circuits required for an installation
*daily and seasonal demand for lighting, power, heating and other loads in a given installation
*number and types of circuits required for a particular installation
*diagrams/schedules of circuits for given installations
*application and arrangements 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, including:
*effects on the human body of various levels of alternating current (a.c.) and direct current (d.c.) current and duration of current flow for various current paths
*risk of ignition of flammable materials due to the thermal effects of current or electric arcs in normal service of an electrical installation
*risk of injury from mechanical movement of electrically actuated equipment
*protection against direct contact (basic protection)
*acceptable methods
*use of ELV
*protection against indirect contact, including:
*indirect contact with live parts of an electrical installation may occur
*components of the 'automatic disconnection of supply' method of protection against indirect contact
*the terms ‘touch voltage’ and ‘touch current’
*the current path when a short circuit fault to exposed conductive parts of an appliance occurs
*protection against indirect contact is by the use of Class II equipment and by electrical separation
*additional protection by use of RCDs
*protection against indirect contact by use of ELV and electrical separation
*protection requirements for damp situations
*earthing, including:
*parts of an earthing system and the purpose of each, including the terms:
*earthed
*earthed situation
*earth electrode
*equipotential bonding
*MEN system
*protective earth-neutral (PEN) conductor
*main earthing conductor
*protective earthing (PE) conductor
*functional earthing
*MEN link
*typical arrangement for a MEN system and for a range of installation arrangements of PE conductors
*typical earthing arrangements for outbuildings
*alternate earthing systems only when required by local Regulatory Authorities (e.g. TT low voltage supply earthing system in dairy sheds in New Zealand)
*requirements for equipotential bonding in a range of installation situations
*protection against overload and short circuit current, including:
*overload current or fault currents in an electrical installation
*limitations of the use of overcurrent protection on current limited sources
*equivalent circuit of an earth fault-loop
*level of fault current possible at a given point in an installation from the fault-loop impedance and data from the local supply authority
*requirements for coordination of protection devices for discrimination and back-up protection, and between protective devices and conductors of an installation
*methods and devices that comply with industry standards for providing protection against the damaging effects of overload and fault current
*devices for automatic disconnection of supply, including:
*operating principles of thermal/magnet circuit breakers, common types of fuses and RCDs
*tripping characteristics of various types of circuit breakers
*time/current curves and fusing characteristics of various types of fuses
*tripping characteristics of various types of RCDs
*factors in a fault-loop that will affect the impedance of the circuit
*maximum impedance of an earth fault-loop to ensure operation of a protection device
*protection against over voltage and under voltage, including:
*causes of over and under voltage and how this may affect the electrical system
*methods for protection against over and under voltage
*control of an electrical installation and circuits, including:
*switch types, current and voltage ratings and ingress protection (IP) rating and where these apply
*switching requirements for isolation, emergency, mechanical maintenance and functional control
*control arrangement for complete installations with and without safety services and an alternative supply, including:
*d.c. polarity requirements
*correct rating of d.c. switches
*switchboards/distribution boards including:
*purpose, types and applications
*physical and circuit arrangements for whole current and current transformer metering
*physical and circuit arrangements of main switches, circuit protection devices, fault current limiters and metering equipment, and other distributor equipment
*switchgear types, ratings, characteristics and applications related to alternate supplies
*compliance requirements, including:
*location and access
*arc-fault protection
*identification
*construction suitability
*equipment marking
*wiring
*fire protection
*relevant WHS/OHS legislated requirements
*relevant workplace documentation
*relevant workplace policies and procedures.