Diagnose and repair faults in complex electrical equipment

1)Scope:1.1) DescriptorThis unit deals with the skills and knowledge required to diagnose and repair faults in complex and H.V. electrical equipment, and may involve the work to be carried out with equipment online.



This unit is intended to augment formally acquired competencies. It is suitable for employment-based programs under an approved contract of training.


Prerequisite Unit(s)




Granting of competency in this unit shall be made only after competency in the following unit(s) has/have been confirmed.

Where pre-requisite pathways have been identified. All competencies in the Common Unit Group must be have been completed.

Common Unit Group

Unit Code

Unit Title


Trouble-shoot and repair faults in low voltage electrical apparatus and circuits


Apply Occupational Health Safety regulations, codes and practices in the workplace


Fabricate, dismantle, assemble of utilities industry components


Solve problems in d.c. circuits


Fix and secure electrotechnology equipment


Use drawings, diagrams, schedules, standards, cords and specifications


Solve problems in single and three phase low voltage machines


Solve problems in single and three phase low voltage electrical apparatus and circuits


Arrange circuits, control and protection for general electrical installations


Solve problems in electromagnetic devices and related circuits


Solve problems in low voltage a.c. circuits


Terminate cables, cords and accessories for low voltage circuits

Literacy and numeracy skills


Participants are best equipped to achieve this unit if they have reading, writing and numeracy skills indicated by the following levels. A description of what each level entails is provided in Section 2.3.1 Language, Literacy and Numeracy.







Elements and Performance Criteria




Plan and prepare for the work


Work requirements are identified from request/work orders or equivalent and clarified/confirmed with appropriate parties or by site inspection


Occupational Health and Safety standards, statutory requirements, relevant Australian standards, codes of practice, manufacturers’ specifications, environmental requirements and enterprise procedures are identified, applied and monitored throughout the work procedure


Resources required to satisfy the work plan are identified, obtained and inspected for compliance with the job specifications


Relevant plans, drawings and texts are selected and interpreted in accordance with the work plan


Correct size, type and quantity of materials/components are determined, obtained and inspected for compliance with the job specifications


Work is planned in detail including sequencing and prioritising and considerations made, where appropriate, for the maintenance of plant security and capacity in accordance with system/site requirements


Co-ordination requirements, including requests for isolations where appropriate, are resolved with others involved, affected or required by the work


Potential hazards are identified and prevention and/or control measures are selected in accordance with the work plan and site procedures


Work area is prepared in accordance with work requirements and site procedures


Where appropriate, the teams and individuals roles and responsibilities within the team are identified and, where required, assist in the provision of the on-the-job training


Verify the fault


Normal performance and function of the equipment is ascertained by consulting appropriate reference sources in accordance with the work plan


Fault indicators and appropriate technical information/diagnostic techniques are used to verify reported symptoms/faults in accordance with the work plan


Symptoms are reproduced and monitored if possible, whilst due regard for personnel safety and plant security is observed in accordance with the work plan


Find the fault


Required isolations are confirmed where appropriate in accordance with site requirements


Fault finding is carried out in conjunction with others involved in, or affected by, the work in accordance with enterprise/job requirements


Equipment components, wires, cables, terminations and support fixings are inspected for obvious faults in accordance with the work plan


All appropriate fault finding/diagnostic techniques are identified, selected and used to determine the fault in accordance with the work plan


All appropriate components are disconnected to enable accurate test measurements of suspected faulty components without the concern of "back-feed" readings in accordance with the work plan


Test and measurement instruments are used in accordance with manufacturer’s instructions and job requirements


Determine cause of fault


All appropriate personnel are consulted in order to obtain as many details relating to the faulty equipment as possible in accordance with the work plan


Appropriate use is made of any information from fault indicators and maintenance records in accordance with the work plan


Valid conclusions about the nature and cause of the fault are reached from analysis of available evidence in accordance with the work plan


Repair or rectify the fault


Required isolations are confirmed where appropriate in accordance with site requirements


Appropriate repair procedures are undertaken in conjunction with others involved in, or affected by, the work in accordance with the work plan


Faulty, worn, damaged or unsecured components are replaced, repaired or secured in accordance with the work plan


Parts and components are selected and replaced as required in accordance with appropriate specifications and the work plan


Components disconnected for testing are reconnected having been proven free of faults and all terminations are then checked to ensure they are electrically and mechanically sound in accordance with the work plan


All faults are repaired or rectified in accordance with the work plan


Final job inspection is performed and permits are relinquished as required in accordance with the work plan


Complete the work


Work is completed and appropriate personnel notified in accordance with site/enterprise requirements


Work area is cleared of waste, cleaned, restored and secured in accordance with site/enterprise procedures


Plant, tools and equipment are maintained and stored in accordance with site/enterprise procedures


Work completion details are finalised in accordance with site/enterprise procedures

Required Skills

8) This describes the Essential Skills and Knowledge and their level, required for this unit.

Evidence shall show that knowledge has been acquired diagnosing and repairing faults in complex electrical equipment.

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies.

The extent of the Essential Knowledge and Associated Skills required follows:

KS01-PM 411B Faults in complex electrical equipment

T1 Evidence shall show that knowledge has been acquired for safe working practices of:

Relevant Environmental, Occupational Health and Safety legislation and regulations

Relevant plant and equipment, its location and operation

Technical drawings and manufacturers manuals

Introduction to and typical arrangements of power production plant

Relevant state and territory regulations

Relevant Australian standards

Equipment and material required to perform the work

Isolation procedures

Fault finding and diagnostic techniques

Repair techniques

Electronic equipment

Electrical principles

Test and measurement instruments

Engineering and electronic workshop practice

T2 Specific skills needed to achieve the Performance Criteria:

Apply Relevant Environmental, Occupational Health and Safety legislation and regulations

Interpret Technical drawings and manufacturers manuals

Apply relevant state and territory regulations

Apply relevant Australian standards

Use tools and relevant equipment

Use test and measurement instruments

Verify and identify faults

Use appropriate fault finding and diagnostic techniques

Repair faults

Select materials for the job

Apply regulatory procedures;

Apply electrical principles

Communicate effectively

Apply data analysis techniques and tools

Apply engineering and electronic workshop practices

Evidence Required

9) This provides essential advice for assessment of the competency standard unit and must be read in conjunction with the Performance Criteria and the Range Statement of unit and the Training Package Assessment Guidelines.

The Evidence Guide forms an integral part of this competency standard unit and shall be used in conjunction with all components parts of this unit and, performed in accordance with the Assessment Guidelines of this Training Package.

Overview of Assessment


Longitude competency development approaches to assessment, such as Profiling, require data to be reliably gathered in a form that can be consistently interpreted over time. This approach is best utilised in Apprenticeship programs and reduces assessment intervention. It is the Industry’s preferred model for apprenticeships. However, where summative (or final) assessment is used it is to include the application of the competency in the normal work environment or in a realistically simulated work environment. It is recognised that, in some circumstances, assessment in part or full can occur outside the workplace. However, it must be in accord with Industry and regulatory policy.

Methods chosen for a particular assessment will be influenced by various factors. These include the extent of the assessment, the most effective locations for the assessment activities to take place, access to physical resources, additional safety measures that may be required and the critical nature of the competencies being assessed.

The critical safety nature of working with electricity, electrical equipment, gas or any other hazardous substance/material carries risk in deeming a person competent. Hence, sources of evidence need to be ‘rich’ in nature so as to minimise error in judgment.

Activities associated with normal every day work have a bearing on the decision as to how much and how detailed the data gathered will contribute to its ‘richness’. Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practiced. These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments. Sample assessment instruments are included in the Assessment Guidelines of this Training Package.

Critical aspects of evidence required to demonstrate competency in this unit


Before the critical aspects of evidence are considered all pre-requisites shall be met.

Evidence for competence in this unit shall be considered holistically. Each element and associated Performance Criteria shall be demonstrated on at least two occasions in accordance with the “Assessment Guidelines – UEP12”. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline, work function and industrial environment. In particular this shall incorporate evidence that shows a candidate is able to:

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the Performance Criteria and Range Statement

Apply sustainable energy principles and practices as specified in the Performance Criteria and Range Statement

Demonstrate an understanding of the essential knowledge and associated skills as described in 6) of this unit

Demonstrate an appropriate level of employability skills

Conduct work observing the relevant Anti Discrimination legislation, regulations, polices and workplace procedures

Demonstrated performance across a representative range of contexts from the prescribed items below:

The knowledge and application of relevant sections of: Occupational Health and Safety legislation; Statutory legislation; Enterprise/site safety procedures; Enterprise/site emergency procedures

Where appropriate attainment of an appropriate electrical licence, deeming competency associated with electrical work

Preparation and planning of work

Verification techniques

Diagnostic and fault finding techniques and procedures

Repair techniques and procedures

Completion of work procedures

Dealing with an unplanned event by drawing on essential knowledge and skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items.

Context of and specific resources for assessment


This unit should be assessed as it relates to normal work practice using procedures, information and resources typical of a workplace. This should include:

OHS policy and work procedures and instructions.

Suitable work environment, facilities, equipment and materials to undertake actual work as prescribed by this unit.

Competency Standards should be assessed in the workplace or simulated workplace and under the normal range of workplace conditions.

Assessment of this unit will be supported with documentary evidence, by means of endorsement stating type and application of work.

In addition to the resources listed above in Context of assessment’, evidence should show competency working, in limited spaces, with different types of plant and equipment as well as different structural/construction types and methods and in a variety of environments.

Method of assessment


This unit shall be assessed by methods given in 1.3.00 Assessment Guidelines.


Competent performance with inherent safe working practices is expected in the Industry to which this unit applies. This requires that the specified essential knowledge and associated skills are assessed in a structured environment which is primarily intended for learning/assessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit.

Concurrent assessment and relationship with other units


There are no recommended concurrent assessments with this unit, however in some cases efficiencies may be gained in terms of learning and assessment effort being concurrently managed with allied competency standard units where listed.


Range Statement

10) This relates to the competency standard unit as a whole providing the range of contexts and conditions to which the Performance Criteria apply. It allows for different work environments and situations that will affect performance.

Inspection should be planned with the appropriate parties to determine access, conditions and work requirements.

Equipment may include HV transformers, tap changers, switchgear and associated control panels, alarms, alternators, igniters, flame scanners, unit control panels, mimic panels, conveyors, alternator cooling systems, automatic voltage regulators, sootblowers, vibratory feeders, battery chargers, precipitators and overhead cranes.

Materials may include masonry anchors, bolts, nuts, washers, screws, rivets, saddles, clips, brackets, solvents, adhesives, insulation tapes, heat shrink, sleeving, spiral binding, cable ties, solder, lubricants, oil, greases, sealants, lugs, connectors, terminal blocks, cable markers, identification labels, transformer oil, jointing compound, cable compounds and phase markers.

Components may include fuses/circuit breakers, timers, contactors, contacts, coils, relays, solenoids, overloads, switches, plugs, busbar, cable, fans, thermostats, elements, seals and motor bearings and brush gear.

Test and measurement instruments may include multimeters, tong testers, insulation resistance/continuity tester, ductor tester, growlers, overload injection tester, liquid leak tester, pressure gauges, vacuum gauges, dew point test equipment, insulating oil tester and specialist test equipment.

Fault finding and diagnostic techniques may include linear approach, half split rule, sensory detection, loop test, insulation/resistance and continuity tests.

Fault indicators may include indication lamps, LEDs, alarms and flag relays.

Work may be performed with equipment on line.

Work completion details may include, plant and maintenance records, job cards, check sheets and on device labelling updates.

Work site environment may be affected by nearby plant or process, e.g. heat, noise, dust, oil, water and chemical.

Isolations can refer to electrical/mechanical or other associated processes.

Generic terms are used throughout this Training Package for vocational standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms are given in Section 2.1 Preliminary Information and Glossaries.


Not applicable.

Employability Skills


The required outcomes described in this unit of competency contain applicable facets of Employability Skills. The Employability Skills Summary of the qualification in which this unit of competency is packaged will assist in identifying Employability Skill requirements.

Licensing Information

License to practice


The skills and knowledge described in this unit may require an electrical licence to practise in the workplace.

Practice in this unit is subject to regulations directly related to Occupational Health and Safety and where applicable contracts of training such as apprenticeships and the like.