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Elements and Performance Criteria

1. Prepare to work on multiple path ELV a.c. electrical circuits.
   • OHS procedures for a given work area are identified, obtained and understood.
   • OHS risk control work preparation measures and procedures are followed.
   • The nature of the circuit(s) problem is obtained from documentation or from work supervisor to establish the scope of work to be undertaken.
   • Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.
   • Sources of materials that may be required for the work are identified and accessed in accordance with established procedures.
   • Tools, equipment and testing devices needed to carry out the work are obtained and checked for correct operation and safety.
2. Solve multiple path ELV a.c. circuit problems.
   • OHS risk control work measures and procedures are followed.
   • The need to test or measure live is determined in strict accordance with OHS requirements and when necessary conducted within established safety procedures.
   • Circuits are checked as being isolated where necessary in strict accordance OHS requirements and procedures.
   • Established methods are used to solve a.c. circuit problems from measure and calculated values as they apply to multiple path electrical circuit.
   • Unexpected situations are dealt with safely and with the approval of an authorised person.
   • Problems are solved without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.
3. Complete work and document problem solving activities.
   • OHS work completion risk control measures and procedures are followed.
   • Work site is cleaned and made safe in accordance with established procedures.
   • Justification for solutions used to solve circuit problems is documented.
   • Work completion is documented and appropriate person(s) notified in accordance with established procedures.

Required Skills

This describes the essential skills and knowledge and their level required for this unit Evidence shall show that knowledge has been acquired of safe working practices and solving problems in multiple path ELV ac circuits All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSEEA Alternating current principles single phase Evidence shall show an understanding of alternating currents principles used in power circuits to an extent indicated by the following aspects T Sinusoidal alternating voltage and current encompassing Generation of a sinusoidal voltage with a single turn coil rotated in a uniform magnetic field the terms period maximum value peaktopeak value instantaneous value average value rootmeansquare rms value crest factor and form factor in relation to a sinusoidal waveform the instantaneous value of induced voltage of a generated sinusoidal waveform measurement of the instantaneous peak peaktopeak values and the period of a sinusoidal waveform the rootmeansquare rms value and frequency of a sinusoidal waveform phase relationship between two or more sinusoidal waveforms T Phasors encompassing the terms inphase outofphase phase angle lead and lag the phase angle between two or more alternating quantities from a given sinusoidal waveform diagram convention for representing voltage current and the reference quantity in a phasor diagram phasor diagrams two or more ac values of voltage andor current T Resistance in ac circuits encompassing connection of a singlesource ac circuit to take resistance voltage and current measurements the voltage current resistances or power dissipated from measured or given values of any two of these quantities the relationship between voltage drops and current in a resistive ac circuit T Inductance in ac circuits encompassing definition of inductive reactance the inductive reactance of a given inductor and show the relationship between inductive reactance and frequency equivalent inductive reactance in an ac circuit or any part of a circuit application of Ohms Law to determine voltage current or inductive reactance in a purely inductive ac circuit given any two of these quantities examples of inductive components in power circuits and systems and describe their effect on the phase relationship between voltage and current the comparative current limiting characteristics of inductors and resistors T Capacitance in ac circuits encompassing definition of capacitive reactance the capacitive reactance of a given capacitor and the relationship between capacitive reactance and frequency equivalent capacitive reactance in an ac circuit or any part of a circuit application of Ohms Law to determine voltage current or capacitive reactance in a purely capacitive ac circuit given any two of these quantities examples of capacitive components in power circuits and systems and describe their effect on the phase relationship between voltage and current T Impedance encompassing definition of impedance impedance of series parallel and seriesparallel circuits and diagrams showing the relationship between resistive inductive and capacitive components impedance triangle connection of a singlesource ac circuit and take resistance voltage and current measurements voltage current or impedance values from measured or given values of any two of these quantities phasor diagram usage to solve problems and show the relationship between voltages and currents in ac circuits T Resonance encompassing conditions in a circuit that produce resonance the relationship between resonance and frequency the effect on the current of series resonance and parallel resonance conditions applications where resonance is applied T Power and power factor encompassing difference between true power apparent power and reactive power and the units definition of the term power factor the effects of low power factor local and ASNZS requirements regarding the power factor of an installation and power factor improvement equipment

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package The Evidence Guide forms an integral part of this unit It must be used in conjunction with all parts of the unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal 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 industrypreferred 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 at a minimum the application of the competency 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 accordance 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 substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment Activities associated with normal everyday 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 practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors 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 prerequisites must 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 UEE 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 this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements Demonstrate an appropriate level of skills enabling employment Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures Demonstrated consistent performance across a representative range of contexts from the prescribed items below Solve problems in multiple path ELV ac circuits as described in and including
	A	Determining the operating parameters of an existing circuit
	B	Altering an existing circuit to comply with specified operating parameters
	C	Developing circuits to comply with a specified function and operating parameters
	D	Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in a 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 in this unit These should be used in the formal learningassessment environment Note Where simulation is considered a suitable strategy for assessment conditions for assessment must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy The resources used for assessment should reflect current industry practices in relation to solving problems in multiple path ELV ac circuits

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines Note 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 learningassessment 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
	For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with unit
	UEENEEEA UEENEEE104A	Solve problems in dc circuits

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Range Statement

10) This relates to the 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. This unit shall be demonstrated in relation to: Single source parallel and series-parallel a.c. circuits as they apply to problems related to installation, fault finding, maintenance or development work functions in any of the following disciplines: Computers Data Communications Electrical Electronics Fire protection Instrumentation Refrigeration and Air Conditioning In relation to at least two of the following types of circuit problems and on at least two occasions determining the operating parameters of an existing circuit altering an existing circuit to comply with specified operating parameters developing circuits to comply with a specified function and operating parameters Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.

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