Application

This unit of competency defines the skills and knowledge required to use test instruments, test the battery, assess and rectify wiring faults.

It applies to testing and rectification activities associated with 12, 24 36 and 48 volt wiring systems on vehicles, mobile plant and stationary equipment.

Where soldering of wires/connections is required unit MEM05001 Perform manual soldering/desoldering - electrical/electronic components should also be selected.

Where an electrical wiring system is above 48 volts unit MEM18045 Fault find and repair electrical equipment/components up to 250 volts single phase supply or unit MEM18046 Fault find and repair electrical equipment/components up to 1000 volts a.c./1500 volts d.c. should also be selected as appropriate.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

What You'll Learn

Assessment Requirements

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 specifications, charts, lists, SOPs, electrical drawings and diagrams to diagnose and rectify batteries, low voltage sensors and circuits

selecting and using the correct test instrument, including multimeters, amp meters and circuit testers, for a variety of electrical circuits to measure current, voltage and resistance of specified circuit components or sections of circuitry

applying Ohm’s Law to determine the required values of current, voltage and resistance of a range of electrical circuits, including series, parallel and series parallel

connecting electrical test instruments into given circuits to determine the required values of current, voltage and resistance in a safe and effective manner

determining the specific gravity of the electrolyte for temperature variations using a hydrometer

preparing dry batteries for charging and recharging and performing discharge testing of batteries

fault finding using fault-finding techniques to identify wiring faults in electrical circuits

selecting appropriate replacement cables according to size, rating and insulation resistance from supplier catalogues

making up replacement wiring looms, stripping and preparing cable ends for termination and terminating to specifications

testing terminations for continuity and compliance with requirements

removing and/or neutralising corrosion from terminals and connections and applying appropriate protective coating

testing and fault finding a range of circuits components, including sensors, relays, solenoids, contacts for repair/replacement.

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)

principles of electron theory

definitions of current, voltage and resistance in terms of electrical circuits

Ohm’s Law and the relationships between current, voltage and resistance for a variety of given electrical circuits

instruments and procedures to be used to measure current, voltage and resistance and safety precautions to be taken

procedures for maintaining electrical test equipment

function of a variety of electrical circuits identified from given electrical drawings/diagrams

symbols used in electrical drawings/diagrams

components of a variety of electrical circuits identified by given electrical drawings/diagrams

differences between series and parallel electrical circuits

function of a general purpose oscilloscope and procedures for connecting a general purpose oscilloscope into given electrical circuits

use of wave forms in the testing of electrical circuits

accuracy to which a range of electrical test equipment can be read

procedures for:

using multipliers and shunts in the measurement of electrical circuits

measuring the specific gravity of the electrolyte and the effect of temperature on the specific gravity of the electrolyte

preparing and recharging dry batteries

discharge testing of batteries and purpose

making up and fixing wiring looms can be given

stripping, fitting and preparing wiring terminations

soft and hard soldering/crimping of wiring terminations

corrosion removal and/or neutralisation

operation of a chemical battery and the function of the electrolyte in batteries and specifications applied to batteries

examples and causes of common faults in electrical wiring and test procedures for isolating wiring faults

specifications of cables and wires, including insulation resistance used in given electrical circuits

test procedures for terminated wiring and cables

effect of corrosion on the performance of electrical circuits and connections

coatings available to stop/inhibit corrosion

correct operational principles of sensors, relays, solenoids and contacts

common faults and causes in sensors, relays, solenoids, contacts and circuits and procedures for testing circuit components.

Assessment Conditions

Assessors must:

have vocational competency in diagnosing and rectifying low voltage electrical systems at least to the level being assessed with relevant industry knowledge and experience

satisfy the assessor requirements in the Standards for Registered Training Organisations 2015 or its replacement and comply with the National Vocational Education and Training Regulator Act 2011, its replacement or equivalent legislation covering VET regulation in a non-referring state/territory as the case requires

Where possible assessment must occur in operational workplace situations. Where this is not possible or where personal safety or environmental damage are limiting factors, assessment must occur in a sufficiently rigorous simulated environment that reflects realistic operational workplace conditions. This must cover all aspects of workplace performance, including environment, task skills, task management skills, contingency management skills and job role environment skills

Conditions for assessment must include access to all tools, equipment, materials and documentation required, including relevant workplace procedures, product and manufacturing specifications.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Foundation Skills

• text: This section describes those required skills (reading, writing, oral communication and numeracy) that are essential to workplace performance in this unit of competency. Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Prerequisite Units

• {'code': 'MEM09002', 'title': 'Interpret technical drawing'}
• {'code': 'MEM11011', 'title': 'Undertake manual handling'}
• {'code': 'MEM12023', 'title': 'Perform engineering measurements'}
• {'code': 'MEM13015', 'title': 'Work safely and effectively in manufacturing and engineering'}
• {'code': 'MEM16006', 'title': 'Organise and communicate information'}
• {'code': 'MEM18001', 'title': 'Use hand tools'}
• {'code': 'MEM18002', 'title': 'Use power tools/hand held operations'}
• {'code': 'MEM18055', 'title': 'Dismantle, replace and assemble engineering components'}

Parent Qualifications

• MEM40119 — Certificate IV in Engineering
  MEM

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