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Elements and Performance Criteria

  1. Determine job requirements
  2. Prepare to fault-find and rectify electrical circuits and equipment
  3. Fault-find and rectify electrical circuits and equipment
  4. Prepare to fault find and rectify electrical circuits and equipment
  5. Fault find and rectify electrical circuits and equipment

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.

Circuits include two (2) or more of the following:

power distribution

lighting control

distributed control system (DCS) instrument loop control

motor control

package unit control

Single circuit may be controlled by one or more devices and the output may control one or more devices

Complex circuit is defined as interdependent circuits and applies to interconnected electrical circuits where electrical equipment and/or components are connected electrically, that is there are multiple electrical power supplies or sources, voltages or circuits which are found in the control or switching of the circuit

Equipmentincludes three (3) or more of the following single and three-phase appliances:

single-phase appliances – hand held power tools, fridges, microwaves, TV’s, lighting, motors, air conditioning units, air compressors, portable pumps, pedestal drills, lathes, bench grinders, motors, fans and fan motors

three phase appliances – variable speed drives (VSDs), fan and pump motors, welding machines, freezer units, heaters, general commercial kitchen equipment, generators, air conditioning units, air compressors and air blowers

Diagnostic techniques include:

testing for voltage, current, frequency, polarity, phase, circuit continuity, insulation resistance and earth continuity

Test equipment includes one (1) or more of the following:

continuity testers

ammeters

voltmeters

multimeters

tong testers

wattmeters

cathode ray oscilloscopes (CROs)

Regulatory requirements include:

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

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 and specifications relevant to the work to be undertaken

determining the electrical and non-electrical isolation requirements to prevent the creation of hazards linked from the loss of machine/system/process control according to established procedures

using lock out tag procedures with appropriate tags/signs

proving electrical isolation and following established safety rules prior to working on electrical equipment or wiring

ensuring all electrical equipment and tools are tested and tagged and up to date

applying methodical diagnostic techniques and using safe working practices to fault find electrical circuits and equipment

using test equipment, including the use of multimeters, cathode ray oscilloscopes (CROs), signal/function generators and power supplies in diagnosing faults in electrical circuits and equipment

taking measurements and compare the results to the calculated value

dismantling, repairing and replacing faulty components and equipment using appropriate hand and power tools and engineering techniques

carrying out electrical tests for continuity and insulation resistance tests on single and three-phase appliances and equipment

repairing faulty electrical installation circuits, components and wiring to comply with relevant standards

retesting according to regulatory and legislative requirements

documenting all reasons and remedial action taken 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)

fault finding techniques, including:

visual inspection

signal injection and measurement

half split rule and component isolation

interpreting wiring and equipment circuits, drawings and specifications

test equipment for diagnosing faults including multimeters, ammeters, voltmeters, continuity testers, wattmeters and tong testers

specialised alternating current (AC) test equipment, including:

CRO and its operating features, interpreting a CRO screen, dual trace CROs and its advantage over a single trace CRO and CRO applications

signal, function generators and power supplies and their operating features and applications when fault finding AC circuits

diagnostic techniques, including testing for voltage, current, frequency, polarity, phase, circuit continuity, insulation resistance and earth continuity

wiring faults, including short circuit, open-circuit, high resistance, breakdown in insulation resistance, residual current device (RCD) tripping, transposition of conductors, earthing, loose connections and corrosion

power distribution, lighting control, signal and data, motor control and package unit control circuits

lighting faults, including switching, lamp holders, ballast, starter, capacitor, igniter, transformer, loose connections, poor contact, corrosion and lighting management systems

equipment faults in the following single-phase appliances:

hand held power tools, fridges, microwaves, hot water systems, TV’s, motors, air conditioning units, air compressors, portable pumps, pedestal drills, lathes, bench grinders, motors, fans and fan motors

equipment faults in the following three-phase appliances:

variable speed drives (VSDs), fan and pump motors, freezer units, welding machines, heaters, general commercial kitchen equipment, generators, air conditioning units, air compressors and air blowers

mechanical faults in motors, including bearings, fans, bent shaft, locked rotor, blocked air vents, centrifugal switches, slipping belts and environmental factors.