NZQA registered unit standard
17809 version 5
Page 1 of 4
Title
Demonstrate knowledge of single-phase and three-phase motors for
electrical service technicians
Level
4
Purpose
Credits
5
This unit standard is for use in the training of electrical service
technicians. It covers theory and practical connection of singlephase and three-phase alternating current (a.c.) motors.
People credited with this unit standard are able to:
–
explain operating principles of electric motors;
–
connect and test electric motors;
–
connect and test direct-on-line three-phase motor starter;
and
–
describe and replace radio interference suppression
circuits for single-phase motors.
Classification
Electrical Engineering > Electrical Service Technicians
Available grade
Achieved
Explanatory notes
1
This unit standard has been developed for learning and assessment off-job.
2
Competency under this unit standard does not entitle the candidate to legally perform
prescribed electrical work without adequate supervision until the candidate has been
registered and licensed under the Electricity Act 1992.
3
References
Electricity (Safety) Regulations 2010;
Electricity Act 1992;
Health and Safety in Employment Act 1992, and associated regulations;
New Zealand Electrical Codes of Practice (Ministry of Business, Innovation and
Employment, ISSN 0114-0663);
AS/NZS 3760:2010, In-service safety inspection and testing of electrical equipment
including Amendment 1;
and all subsequent amendments and replacements.
4
Definition
Industry practice – those practices, which competent practitioners within the industry
recognise as current industry best practice.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
17809 version 5
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Explain operating principles of electric motors.
Range
single-phase, at least two of – universal, shaded pole, standard split-phase,
capacitor-start, capacitor-start-and-run, permanently split;
three-phase – squirrel cage induction motor.
Evidence requirements
1.1
Motor operating principle is explained with reference to circuit diagram,
construction, and interaction of stator and rotor, production of rotating magnetic
field, and method of starting.
Range
reference to mathematical formulae is not required; circuit
diagrams produced from memory.
1.2
The method of reversing the direction of rotation is explained.
1.3
A typical industry application is stated in accordance with industry practice.
1.4
The types of motor protection are stated with reasons for their use in
accordance with industry practice.
Range
1.5
overload, phase failure, phase reversal, no voltage.
Method of speed control is explained in simple terms with reference to a circuit
diagram.
Outcome 2
Connect and test electric motors.
Range
single-phase, at least two of – universal, shaded pole, standard split-phase,
capacitor-start, capacitor-start-and-run, permanently split;
three-phase – squirrel cage induction motor.
Evidence requirements
2.1
Safety inspection and testing in accordance with AS/NZS 3760 confirms that the
motor is safe to connect to the supply.
2.2
Motor voltage rating is checked on manufacturer’s plate, and internal links
adjusted to suit.
2.3
Motor is connected to the electricity supply in accordance with industry practice
and Electricity (Safety) Regulations 2010.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.4
Observation and electrical testing confirms safe motor operation in accordance
with industry practice.
Range
2.5
17809 version 5
Page 3 of 4
observation – direction of motor rotation, smooth and quiet
running, operation of centrifugal starter switches where
appropriate;
tests – polarity, continuity of earthing, on/off switching, live ratedvoltage, no-load current, full-load current, comparison with name
plate values.
Direction of rotation is reversed in accordance with industry practice.
Outcome 3
Connect and test direct-on-line three-phase motor starter.
Evidence requirements
3.1
Wiring diagram is drawn from memory in accordance with industry practice.
3.2
Connections are made in accordance with the wiring diagram and industry
practice.
3.3
Safety inspection and testing in accordance with AS/NZS 3760, confirms that
the starter is safe to connect to the supply.
Range
testing – polarity, continuity of earthing.
3.4
Starter is connected to the electricity supply in accordance with industry
practice.
3.5
Testing confirms safe operation of starter in accordance with industry practice.
Range
testing – live rated-voltage test, current rating, operation of
overload, operation of local and remote start-stop stations, no-volt
protection where appropriate, direction of motor rotation.
Outcome 4
Describe and replace radio interference suppression circuits for single-phase motors.
Range
single-phase, at least two of – standard split-phase, capacitor-start, capacitorstart-and-run, permanently split.
Evidence requirements
4.1
A typical radio interference suppression circuit is described for a single-phase
motor with reference to circuit diagram, typical component values, component
ratings, and maximum permitted component values.
4.2
A radio interference suppression circuit is replaced on a single-phase motor in
accordance with industry practice.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
17809 version 5
Page 4 of 4
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
25 November 2000
31 December 2013
Revision
2
19 May 2004
31 December 2013
Review
3
20 June 2006
N/A
Rollover and
Revision
4
20 September 2012
N/A
Revision
5
15 January 2014
N/A
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact The Skills Organisation reviewcomments@skills.org.nz if you wish to
suggest changes to the content of this unit standard.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016