NZQA registered unit standard
28895 version 1
Page 1 of 4
Title
Maintain substation earthing and bonding
Level
3
Credits
3
Purpose
People credited with this unit standard are able to: interpret
design drawings and installation requirements of earthing and
bonding standards; maintain earth mats and bonding to
equipment used in substations; and inspect earthing and
bonding system.
Classification
Electricity Supply > Electricity Supply - Power System
Maintenance
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for workplace assessment. The range statements and
evidence requirements across the unit standard can be applied according to industry
specific equipment, procedures, and processes.
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 the latest version of, Safety Manual – Electricity Industry (SM-EI) Wellington:
3
References
AS/NZS 3000: Electrical Installations (known as the Australian/New Zealand Wiring
Rules);
Electricity (Safety) Regulations 2010 and amendments;
Electricity (Safety) Regulations 2010 - Schedule 2 Electrical codes of practice and
official standards;
The New Zealand Electrical Codes of Practice (NZECP) (Ministry of Economic
Development, ISSN 0114-0663)
Electricity Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 1245
Hamilton 3240.
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28895 version 1
Page 2 of 4
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.
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.
6
The outcomes of this unit standard could be meet by carrying out an installation of a
substation earth matt and bonding
Outcomes and evidence requirements
Outcome 1
Interpret design drawings and installation requirements of substation earthing and
bonding.
Evidence requirements
1.1
The earthing and bonding design drawings are interpreted.
1.2
The earthing and bonding installation standards are interpreted.
Range
1.3
includes – knowledge and verification of understanding of the
requirements of NZECP 35, AS/NZS 3000: Section 5 and
amendments.
The drawings and standards are translated into practical installation
requirements.
Range
includes but is not limited to – quantities and size of bonding
conductors, distances, fixtures and excavation requirements,
installation work plan.
Outcome 2
Carry out maintenance of earth mats and bonding to equipment used in substations.
Evidence requirements
2.1
The required materials, plant, tools and resources are assembled in terms of
client installation or maintenance requirements.
Range
2.2
includes but is not limited to – the selection of suitable moulds to
suit the conductors if exothermic welding (cadweld) is to be used
for jointing and terminating conductors, welding tools, and
materials.
The earth mat maintenance is completed to the work plan.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.3
28895 version 1
Page 3 of 4
All bus system equipment is bonded to the earth mat.
Range
may include but is not limited to checks of all earthing bonds to
ensure acceptability of connection to the earth mat.
Outcome 3
Inspect earthing and bonding system.
Evidence requirements
3.1
Each item of bus equipment is bonded to meet the requirements of the earthing
and bonding standards under the regulations.
3.2
Operational safety earthing tail clamps and bus bonding points are located at
operationally suitable positions to allow compliance with industry electrical
safety rules.
Range
3.3
may include but is not limited to: providing suitably located bus
bonding points as specified for operational requirements.
The earth mat resistance is checked to ensure it meets specification
requirements.
Range
3.4
includes but is not limited to: compliance with NZECP 35 in regard
to step and touch voltages resistance
Specialist earthing requirements for substations are described.
Range
includes but is not limited to: operators mat, operator equipment
handles.
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
17 March 2016
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.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28895 version 1
Page 4 of 4
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 ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016