UEEEL0020 — Solve problems in low voltage a.c. circuits

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What an assessment for UEEEL0020 must cover

125 assessable components: 3 elements (20 performance criteria), 37 performance evidence and 67 knowledge evidence requirements, plus 1 foundation skills. An audit-defensible tool maps every question and task back to these — that mapping is the coverage matrix Auditori generates alongside the assessment.

Elements & performance criteria

1 Identify low voltage (LV) a.c. circuit problem

1.1WHS/OHS requirements and workplace procedures for work area are identified and applied
1.2Hazards are identified, risks are assessed and control measures and workplace procedures are implemented
1.3Safety hazards which have not previously been identified are noted on job safety assessments and existing risk control measures are implemented
1.4Circuit problems are identified from documentation or work supervisor to determine the scope of work
1.5Advice is sought from the work supervisor to ensure work is coordinated effectively with others
1.6Sources of materials required for work are identified in accordance with workplace procedures
1.7Tools, equipment and testing devices to carry out work are obtained and checked for correct operation and safety

2 Solve LV a.c. circuit problems

2.1WHS/OHS risk control measures and workplace procedures for carrying out work are followed
2.2Need to test or measure live work is determined in accordance with WHS/OHS requirements and, as required, conducted in accordance with workplace safety procedures
2.3Circuits/machines/plant are checked and isolated, as required, in accordance with WHS/OHS requirements
2.4Methodical techniques are used to resolve circuit problems from measured and calculated values as they apply to single and three phase LV circuits in accordance with workplace procedures
2.5Existing circuits are altered to comply with power factor correction in compliance with industry standards
2.6Power factor of a circuit is calculated from given measurements
2.7Low power factor is improved by altering the reactive power of a circuit
2.8Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
2.9Problems are resolved without damage to apparatus, circuits, the surrounding environment or services using sustainable energy practices

3 Complete work and document activities

3.1WHS/OHS work completion risk control measures and workplace procedures are followed
3.2Worksite is cleaned and made safe in accordance with workplace procedures
3.3Justification for solutions used to resolve circuit problems is documented in accordance with workplace procedures
3.4Work completion is documented and an appropriate person/s notified in accordance with workplace procedures

Performance evidence

applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements Including: implementing OHS/WHS workplace procedures and practices, including risk control measures
safely measuring the parameters for the whole or any part of a circuit
measuring: instantaneous, peak, peak-to-peak values and the period of a sinusoidal waveform
the phase angle between two or more alternating quantities from a given sinusoidal waveform diagram
the fault-loop impedance of typical circuits
the branch currents and voltages in a series and parallel resistance inductance capacitance (RLC) circuit and use a phasor diagram to determine the total current and phase angle between circuit voltage and circuit current
determining: phase relationship between two or more sinusoidal waveforms from a given diagram
the impedance, current and voltages and phase angles for a series and parallel resistance capacitance (RC), resistance inductance (RL), and RLC circuit given the resistance, capacitance, inductance and supply voltage
comparison of current limiting characteristics of inductors and resistors
the relationship between inductive reactance and capacitive reactance and frequency
difference between true power, apparent power and reactive power and the units in which these quantities are measured
the root-mean-square (rms) value of line and phase, voltage and current given any one of these quantities
the effects of a high impedance in the neutral conductor of a three phase four wire system supplying an unbalanced load where multiple earthed neutral (MEN) earthing is employed
the value of neutral current in an unbalanced three phase four wire systems given line currents and power factors
how the power factor of a three phase installation can be improved
fault loop impedance using resistance and reactance values from relevant industry standards
voltage, current and resistance from measured or given values of any two of these qualities
the phase sequence of a three phase supply
drawing and labelling the following: the power triangle to show the relationships between true power, apparent power and reactive power
the typical combinations of three phase interconnected systems using star and delta connection
the impedance triangle for a series RC, RL and RLC circuit
the equivalent circuit of a practical inductor
phasor diagrams to show: the relationship between two or more alternating current (a.c.) values of voltage and/or current, including ‘in-phase’, ‘out-of-phase’, ‘phase angle’, lead’ and ‘lag’
a series and parallel RC, RL, and RLC circuits
calculating: rms value of voltage generated in each phase given the maximum value
terms in relation to a sinusoidal waveform from values of root-mean-square (rms) value, frequency, peak voltage, period and instantaneous value
capacitive reactance and inductive reactance for a given capacitor and inductor
total impedance for a series and parallel RLC circuit
connecting a three-phase star and delta load
setting up and connecting a single-source resistive a.c. circuit and taking voltage and current measurements to determine the resistance
applying sustainable energy principles and practices
completing workplace documentation
voltage, current and reactance of inductive and capacitive reactance by applying Ohm’s law in purely inductive and capacitive a.c. circuits given any two quantities
altering an existing circuit to comply with specified operating parameters
developing circuits to comply with a specified function and operating parameters
determining conditions causing an existing circuit to be unsafe
dealing with unplanned events.

Knowledge evidence

a.c. quantities, including: Pythagoras theorem to a right-angle triangle
sine, cosine and tangent ratios of a right-angle triangle
sinusoidal voltage generated by a single turn coil rotated in a uniform magnetic field and resulting current
terms in relation to a sinusoidal waveform involving: period
maximum value
peak-to-peak value
instantaneous value
average value
rms value
use of a cathode-ray oscilloscope (CRO) to measure d.c. and a.c. voltage levels
phasor diagrams, including: convention for representing voltage, current and the reference quantity in a phasor diagram
purpose of phasor diagrams
single element a.c. circuits, including: applications of capacitive, inductive and resistive a.c circuits
defining inductive and capacitive reactance
relationship between voltage drops and current in resistive a.c. circuit
arrangement, characteristics of single item inductive and capacitive circuits
RC and RL series a.c. circuits, including: capacitive and inductive components in power circuits and systems and the effect on the phase relationship between voltage and current
impedance and impedance triangle
voltage triangle
arrangement, characteristics, and relationship between resistance, capacitance and inductance in RL, RC, and LC series circuits
RLC series and parallel a.c. circuits, including: practical examples of RLC series and parallel circuits
voltage and current triangle
relationship between resistance, capacitance and inductance in RLC parallel circuits
power in an a.c. circuit, including: definition of power factor and phase angle
methods used to measure single phase power, energy and demand
effects of low power factor
power factor improvement, including: requirements for power factor improvement
methods used to improve low power factor of an installation
local supply authority and AS/NZS 3000 requirements regarding the power factor of an installation and power factor improvement equipment
local supply authority and AS/NZS 3000 requirements for installation of capacitors including safety considerations
using manufacturer catalogues to select power factor equipment for a particular installation
harmonics and resonance effect in a.c. systems, including: conditions in a series and parallel a.c. circuit that produce resonance
dangers of series and parallel resonance circuits
methods and test equipment used to test for harmonics
methods used to reduce harmonics in a.c. power system
problems that may arise in a.c. circuits as a result of harmonics and how these are overcome
sources in a.c. systems that produce harmonics
term harmonic in relation to the sinusoidal waveform of an a.c. power system
three phase systems, including: features of a multi-phase system
comparison of voltages generated by single and multi-phase alternators
how three phase is generated in a single alternator
advantages of three phase for power systems
relationship between the phase voltages generated in a three phase alternator and the conventions for identifying each
method of determining the phase sequence or phase rotation of a three-phase supply
three phase star connections, including: arrangement and characteristics of a three phase star connection
effect of a reversed phase winding of a star connected alternator
examples of balanced and unbalanced loads in typical power systems
terms balanced load and unbalanced load
three phase four wire systems, including: purpose of the neutral conductor in three phase four wire systems
AS/NZS 3000 requirements regarding neutral conductors
AS/NZS 3008.1.1 Electrical installations - Selection of cables - Cables for alternating voltages up to and including 0.6/1 kV - Typical Australian installation conditions method for determining voltage drop in unbalanced three phase circuits
three phase delta connections and interconnected systems, including: arrangement and characteristics of a three phase delta connection
effect of a reversed phase winding of a delta connected transformer
examples of loads in typical power systems
limitations and uses of open delta connections
energy and power requirements of ac systems, including: purposes for measuring power, energy, power factor and maximum demand of a.c. power systems and loads
difference between true power, apparent power and reactive power and the units in which these quantities are measured in a three phase system
methods used to measure three phase power, energy, power factor and demand
using manufacturers catalogues to select measurement equipment for a particular installation
fault-loop impedance, including: procedures for testing fault-loop impedance
term fault-loop impedance of an a.c. power system
local requirements and relevant industry standards relating to: the installation of capacitors
the power factor of an installation and power factor improvement equipment
harmonics and resonance effect in a.c. power systems
neutral conductors
phase relationship between line and phase voltages and line and phase currents of star, delta, and typical interconnected systems using star connections and delta connections
relevant manufacturers’ specifications

Foundation skills

Embedded: Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

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Questions about assessing UEEEL0020

What does an assessment tool for UEEEL0020 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for UEEEL0020 needs to address all 125 unit components: 3 elements with 20 performance criteria, 37 performance evidence requirements, 67 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for UEEEL0020?

Auditori pulls the current release of UEEEL0020 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

Yes. Every new account includes one free credit — enough to generate the complete assessment tool for UEEEL0020 — with no card and no subscription required. After that it's pay-as-you-go per unit.

Can I check my existing UEEEL0020 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of UEEEL0020, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.

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