Unit of competency Outline

Date retreived
22/07/2026 10:40 PM AWST

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Isolate, test and troubleshoot low voltage electrical circuits

Isolate, test and troubleshoot low voltage electrical circuits

Unit of competency
National Code
UEEEL0014
State Code
OBX93
TGA Status
Current
DTWD Status
Approved
Current Release Number
2.00
Current Release Date
19/07/2022
View on TGA
State Implementation and Classification
Approved Date
12/07/2021
Field of Education
031313 - Electrical Fitting, Electrical Mechanics
Original Release Date
12/07/2021
Nominal Hours
54
Description
This unit involves the skills and knowledge required to isolate, test and troubleshoot electrical circuits operating at voltages up to 1,000 volts (V) alternating current (a.c.) or 1,500 V direct current (d.c.).It includes working safely, isolating electrical circuits, evaluating low voltage (LV) electrical circuits, applying systematic fault-finding procedures, conducting repairs and completing the necessary documentation.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 circuits and equipment which are designed to operate at voltages greater than 50 V a.c. or 120 V d.c. Competency development activities in this unit are subject to regulations directly related to licensing. Where a licence or permit to practice is not held, a relevant contract of training, such as an Australian Apprenticeship, may be required. Additional and/or other conditions may apply in some jurisdictions subject to regulations related to electrical work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations.
Notes
Elements and Performance Criteria
1 Prepare to isolate, test and troubleshoot electrical circuits
  • 1.1 Scope of work to be undertaken is determined from relevant documentation, electrical drawings or relevant person/s
  • 1.2 WHS/OHS requirements and workplace procedures for a given work area are identified and applied
  • 1.3 Electrical hazards are identified, risks are assessed, and control measures are implemented
  • 1.4 Relevant industry standards, regulation, legislation and workplace procedures are identified and applied
  • 1.5 Advice is sought from the work supervisor to ensure the work is coordinated effectively with others
2 Apply safe isolation, lock-out and tag-out procedures
  • 2.1 Electrical circuits and conductors, all of their energy sources, and isolation points are identified
  • 2.2 Electrical circuits are isolated from all energy sources and secured in accordance with industry and regulatory standards
  • 2.3 Safe isolation from all sources of energy is confirmed
  • 2.4 Isolation is secured using appropriate devices, tags, lock-out or permit system
  • 2.5 Any stored energy is discharged and deenergisation proved
  • 2.6 Unused conductors and equipment are dealt with in accordance with regulatory requirements
3 Conduct compliance inspection and testing on electrical circuits
  • 3.1 Electrical circuits are visually inspected for compliance with regulatory requirements
  • 3.2 Mandatory tests are identified, including sequence of tests and equipment required
  • 3.3 Continuity of the earthing system is tested for compliance with regulatory requirements
  • 3.4 Insulation resistance of the circuit is tested for compliance with regulatory requirements
  • 3.5 Polarity of the circuit is tested for compliance with regulatory requirements
  • 3.6 Correct circuit connections is tested for compliance with regulatory requirements
  • 3.7 Alternative supply systems are inspected and tested for compliance with industry and regulatory standards
  • 3.8 Earth fault loop impedance is verified for compliance with regulatory requirements
  • 3.9 Operation of residual current devices (RCDs) is tested for compliance with regulatory requirements
  • 3.10 Compliance test results are documented and reported in accordance with industry and workplace requirements
  • 3.11 Non-compliances are identified and reported to relevant personnel
  • 3.12 Requirements for the verification of circuits are completed in accordance with regulatory requirements
4 Locate, identify and repair faults in electrical circuits
  • 4.1 Circuits/machines/plant are checked as being isolated, where necessary, in strict accordance WHS/OHS requirements and procedures
  • 4.2 Safety hazards resulting from the fault or breakdown are documented and risk control measures identified and implemented in consultation with appropriate person/s
  • 4.3 Troubleshooting of electrical circuits is undertaken methodically using measured and calculated values of circuit parameters
  • 4.4 Circuit components are dismantled and parts stored to protect against loss or damage
  • 4.5 Faulty circuits/components are rechecked and their fault status identified
  • 4.6 Materials/replacement parts required to rectify faults are sourced and obtained in accordance with workplace procedures
  • 4.7 Effectiveness of the repair is tested in accordance with workplace procedures
  • 4.8 Circuit is reassembled, tested and prepared for return to service
  • 4.9 Unexpected situations are dealt with safely and with the approval of authorised person/s
  • 4.10 Troubleshooting and repair activities are carried out without damage to equipment, circuits, the surrounding environment or services using sustainable energy practices
5 Complete work and document activities
  • 5.1 WHS/OHS work completion risk control measures and workplace procedures are followed
  • 5.2 Work area is cleaned and made safe in accordance with workplace procedures
  • 5.3 Work completion is documented and appropriate person/s notified in accordance with workplace procedures
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