NZQA registered unit standard
28945 version 1
Page 1 of 2
Title
Demonstrate knowledge of three-phase theory for line maintainers
Level
3
Credits
3
Purpose
People credited with this unit standard are able to demonstrate
knowledge of three-phase theory for a transmission line
maintainer.
Classification
Electricity Supply > Electricity Supply - Transmission Networks
Available grade
Achieved
Explanatory notes
1
This unit standard can be assessed in a training or educational environment.
2
Performance and work practices in relation to the outcomes and evidence
requirements must comply with all current legislation, especially the Electricity Act
1992 and any subsequent amendments, and any regulations, codes of practice
recognised under that statute; Health and Safety in Employment Act 1992, the
Resource Management Act 1991, and their subsequent amendments; electricity
supply industry codes of practice and documented enterprise procedures. These
include updated versions of Safety Manual – Electricity Industry (SM-EI) Wellington:
Electricity Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 2759
Wellington 6140.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of three-phase theory for line maintainers.
Evidence requirements
1.1
Three-phase terms are defined and explained with reference to electricity
transmission systems.
Range
may include but is not limited to – line voltages, phase voltages, star, delta,
phase sequence.
1.2
Relationship between line and phase voltages are explained for star and delta
connected loads.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28945 version 1
Page 2 of 2
1.3
Values of line and phase voltages are calculated from given data.
1.4
The relationship between star connected and delta connected transmission and
distribution systems is explained
1.5
Advantages of three-phase over single-phase supply systems are identified.
may include but is not limited to – conductor size and volume,
switch gear current rating, equipment current ratings and load
capacities.
Range
Planned review date
31 December 2020
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
20 August 2015
N/A
Consent and Moderation Requirements (CMR) reference
0120
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 Infrastructure ITO (Connexis) qualifications@connexis.org.nz if you
wish to suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016