NZQA registered unit standard
28492 version 1
Page 1 of 4
Title
Demonstrate knowledge of earthing and bonding mobile equipment
around power lines for vegetation control and tree work
Level
3
Credits
4
Purpose
People credited with this unit standard are able to demonstrate
knowledge of: earthing and bonding for vegetation control and
tree work in an electricity supply worksite; regulatory
requirements for mobile equipment around power lines;
electrical bonding; and earthing mobile equipment.
Classification
Electricity Supply > Electricity Supply - Distribution Networks
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for off-job assessment. The range statements across
the unit standard can be applied according to industry specific equipment,
procedures, and processes as used in the electricity supply industry.
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, and the 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) (2010) Wellington: Electricity
Engineers’ Association (EEA).
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 1245
Hamilton 3240.
3
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
4
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.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28492 version 1
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of earthing and bonding for vegetation control and tree work in an
electricity supply worksite.
Evidence requirements
1.1
Sources that cause development of hazardous voltages in the workplace are
explained.
Range
may include but not limited to – lightning strikes, fault currents.
1.2
Earth potential rises (EPR) in a worksite during a fault situation are explained.
1.3
The equipotential zone on a worksite is explained.
1.4
Methods of reducing hazardous voltage exposure during faults to vegetation
workers are explained.
Range
1.5
Factors that reduce effective grounding, earthing, and bonding at a worksite are
explained.
Range
1.6
grounding, earthing, bonding.
may include but is not limited to – site layout, soil resistivity,
climatic conditions, size and length of earthing and bonding
conductors, placement of earthing electrodes, condition of
terminations and electrodes.
Hazards of poorly implemented earthing and bonding in a vegetation control
worksite are explained.
Range
generation of step, touch and hand to hand voltages.
Outcome 2
Demonstrate knowledge of earthing regulatory requirements for mobile equipment around
power lines.
Evidence requirements
2.1
Earthing terms are described.
Range
2.2
earthed, earthing system, earth electrode, earth impedance,
earthing conductor.
Reasons for the requirement of low resistance for an earthing system are
explained.
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.3
28492 version 1
Page 3 of 4
Metalwork on mobile equipment that must be earthed is described.
Range
may include but is not limited to – exposed metalwork forming
parts of mobile equipment, parts of mobile equipment within
minimum approach distances (MAD).
2.4
Metalwork that must not or need not be earthed or bonded is explained.
2.5
Specific requirements for earthing and bonding mobile equipment are
explained.
Range
may include but is not limited to – NZECP 35:1993, Power network
earthing and bonding standards, asset owner’s requirements,
SM-EI guidelines.
Outcome 3
Demonstrate knowledge of electrical bonding.
Evidence requirements
3.1
Bonding terms are described.
Range
electrical bonding, earth bonding, equipotential bonding.
3.2
The need for bonding metalwork in terms of the elimination of the risk of electric
shock and for prevention of arcing is explained.
3.3
Situations requiring bonding are described.
Range
3.4
may include but is not limited to – mobile equipment, uninsulated
metalwork;
evidence of at least two items required.
Bonding methods within the equipotential zone are described.
Outcome 4
Demonstrate knowledge of earthing mobile equipment.
Evidence requirements
4.1
Sketch of earthing and bonding system for a worksite is drawn showing all
mobile equipment, earthing sources, bonding and earthing cable lengths and
sizes, and earthing sources within the equipotential zone.
Planned review date
31 December 2019
Infrastructure Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28492 version 1
Page 4 of 4
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
20 November 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.
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
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