20190 version 2
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Conduct introductory insulation resistance testing in the electricity
supply industry
Level
2
Credits
2
Purpose
People credited with this unit standard are able to: demonstrate an
introductory knowledge of insulation resistance theory and operation of an
electrical insulation resistance tester; and carry out low voltage insulation
resistance tests.
Subfield
Electricity Supply
Domain
Electricity Supply - Testing
Status
Registered
Status date
16 April 2010
Date version published
16 April 2010
Planned review date
31 December 2014
Entry information
Open.
Accreditation
Evaluation of documentation by NZQA.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard is intended for, but not restricted to, workplace assessment.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop.
© New Zealand Qualifications Authority 2010
20190 version 2
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3
Performance and work practices in relation to the elements and performance criteria
must comply with all current legislation, especially the Electricity Act 1992, and any
regulations and codes of practice recognised under that statute; the Health and
Safety in Employment Act 1992; and the Resource Management Act 1991.
Electricity supply industry codes of practice and documented industry procedures
include the Safety Manual – Electricity Industry (SM-EI) Wellington: Electricity
Engineers’ Association. A full list of current legislation and industry codes is
available from the Electricity Supply Industry Training Organisation, PO Box 1245,
Hamilton 3240.
4
The phrase in accordance with industry requirements is implicit in all elements and
performance criteria in this unit standard.
5
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.
6
The term insulation resistance relates to the electrical quantity of resistance between
insulated conductors or between insulated parts of equipment which are normally
electrically energised (live) and earth.
7
Other codes and references include: NZ Electrical Code of Practice (NZECP)
11:1993, Inspection and testing of low voltage installations for certification purposes;
Electricity Regulations 1997 (for description of the term low voltage); AS/NZS
3000:2007, New Zealand Wiring Rules; AS/NZS 3760:2003, In-service safety
inspection and testing of electrical equipment.
Elements and performance criteria
Element 1
Demonstrate an introductory knowledge of insulation resistance theory and operation of an
electrical insulation resistance tester.
Performance criteria
1.1
The function of electrical insulation is identified in terms of separation of
conductors, and isolation of electrical components from earth.
Range
insulation materials – PVC (polyvinyl chloride), paper and other
cellulose type materials, XLPE (cross-linked polyethylene),
insulating oil, mica;
physical properties – ability (of insulation) to withstand applied
voltage, ratio of insulation resistance to length or amount of
conductor materials in proximity;
electrical equivalent of insulation – a parallel resistor/capacitor
circuit.
© New Zealand Qualifications Authority 2010
20190 version 2
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1.2
The operation of an electrical insulation resistance tester is described in terms
of the use of Ohms Law to determine insulation resistance values from the
application of a known direct current voltage and measurement of current
through insulation material.
Element 2
Carry out low voltage insulation resistance tests.
Performance criteria
2.1
Insulation resistance tester is connected.
2.2
Insulation resistance tester is operated and performance verification carried out.
2.3
Insulation resistance tests are conducted.
Range
2.4
a minimum of 5 tests from the following
electrical wiring or installations (in accordance with NZECP
11:1993 or AS/NZS 3000:2007);
electrical appliances in accordance with AS/NZS 3760:2003;
prepared cable or device specimens.
Insulation test results are recorded and analysed.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP 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 Electricity Supply Industry Training Organisation info@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
© New Zealand Qualifications Authority 2010