NZQA registered unit standard
28194 version 1
Page 1 of 4
Title
Demonstrate knowledge of, and carry out polarity and phasing on
electricity supply networks
Level
3
Credits
3
Purpose
People credited with this unit standard are able to demonstrate
knowledge of and carryout power supply polarity, and phasing
in low voltage (LV) and high voltage (HV) installations and
works, in accordance with industry requirements.
Classification
Electricity Supply > Electricity Supply - Core Skills
Available grade
Achieved
Explanatory notes
1
This unit standard may be assessed in an Electricity Supply workplace, or in an
Electricity Supply simulated training environment or combination of both.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop and the candidate will be
assessed as not yet competent.
3
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, Safety Manual – Electricity Industry (SM-EI) (2004) Wellington: Electricity
Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 1245
HAMILTON.
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
5
Definitions
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, business, and quality management requirements
relevant to the workplace in which assessment is carried out.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28194 version 1
Page 2 of 4
Asset owner refers to the owner of an electricity supply network that takes its point of
supply from Transpower NZ, and delivers electricity to industrial, commercial and
residential customers.
Asset owner standards are the approved documented work site methods for carrying
out work on an electrical supply network to the standard required by the asset owner.
6
Assessment of practical skills against the outcomes in this standard requires three
practical observations from three different workplace activities.
7
LV is defined as low voltage and includes voltages up to and including 1000 volts AC.
HV is defined as high voltage and includes voltages greater than 1000 volts AC.
8
This unit standard is intended for the assessment of Cable Jointers, Distribution and
Transmission Line Mechanics and all terminology and workplace assessment should
be related to that sector of the industry.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of, and carry out electricity supply polarity.
Evidence requirements
1.1
Polarity terms are described.
Range
1.2
Reasons for correct supply polarity in LV systems are described.
Range
1.3
phase – neutral reversal, voltage to remote earth, rise of earth
potential, voltage fluctuations in supply with change of load.
Methods for testing polarity in LV systems are described.
Range
1.5
safety (to life and property), risk prevention of exposure to shock
and fire damage, live conductors to be switched, neutral
conductors at ‘O’ or earth potential, commissioning and recommissioning of equipment.
The effects of incorrect polarity, high impedance neutral, and open circuit
neutral in a LV installation are described.
Range
1.4
low voltage (LV), naming and colour identification of live
conductors, earth and neutral conductors.
may include but is not limited to – voltage measurement to a
remote earth, measurement of current in phase, neutral and
earthing lead conductors, and continuity measurements to identify
conductors prior to connection;
evidence of two is required.
Effect on an electrical installation of incorrect polarity connections and open
circuit neutral is explained.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.6
28194 version 1
Page 3 of 4
Carry out polarity tests on an LV circuit to comply with electrical regulations and
conventions.
Outcome 2
Demonstrate knowledge of, and carry out phasing in LV and high voltage (HV) installations
and works.
Evidence requirements
2.1
Phasing terms are described.
includes but is not limited to – vector grouping of transformers,
phase marking and identification of conductors (R, W, B, A, B, C).
Range
2.2
Purpose of phasing checks is described.
Range
2.3
paralleling supplies and transformers, reconnection of conductors
(cables and overhead) after repair, commissioning new equipment
and re-commissioning after repair, phase rotation of supplies.
Methods for testing of phasing are described and demonstrated.
may include but is not limited to – use of phasing phones,
continuity tests, comparison of voltages between a known source
and connections being tested, use of high voltage phasing and
voltage detection equipment;
evidence of two is required.
Range
2.4
Carry out phasing tests on LV or HV circuits to comply with electrical regulations
and conventions.
Planned review date
31 December 2018
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
20 March 2014
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.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28194 version 1
Page 4 of 4
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 Industry Training Organisation at
qualifications@infrastructureito.org.nz if you wish to suggest changes to the content of this
unit standard.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016