NZQA registered unit standard
20191 version 3
Page 1 of 3
Title
Conduct advanced insulation resistance testing in the electricity
supply industry
Level
4
Credits
5
Purpose
People credited with this unit standard are able to demonstrate
an advanced knowledge of insulation resistance theory; and
carry out advanced insulation resistance tests.
Classification
Electricity Supply > Electricity Supply - Testing
Available grade
Achieved
Entry information
Critical health and
safety prerequisites
Unit 20190, Conduct introductory insulation resistance testing
in the electricity supply industry, or demonstrate equivalent
knowledge and skills.
Explanatory notes
1
This unit standard is intended for, but not restricted to, workplace assessment. The
range statements across the unit standard can be applied according to
industry-specific equipment, procedures, and processes.
2
Safety of personnel and plant must be prioritised during assessment against this unit
standard. If the client safety requirements are not met assessment must stop.
3
Performance of the evidence requirements 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 current version of 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 applies to all of the evidence
requirements in this unit standard.
5
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements. Enterprise requirements may include
the documented workplace policies, procedures, specifications, business, and quality
management requirements relevant to the workplace in which assessment is carried
out.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20191 version 3
Page 2 of 3
Outcomes and evidence requirements
Outcome 1
Demonstrate an advanced knowledge of insulation resistance theory.
Evidence requirements
1.1
Advanced electrical insulation testing theory is described.
Range
1.2
insulation materials – PVC (poly vinyl chloride), paper and other
cellulose type materials, XLPE (cross-linked polyethylene),
insulating oil, mica.
electrical equivalent of insulation – description of (resistive)
leakage current, absorption and re-absorption current, capacitive
charge current quantities and relationship.
risks associated with DC testing – including residual charge, direct
current offset voltage, damage due to transient (reflected)
voltages.
The operation of an electrical insulation resistance tester is explained.
Range
insulation resistance values from the application of a known DC
voltage and measurement of current through insulation material,
basic electrical components of an insulation resistance tester,
guard connection and reason for use.
Outcome 2
Carry out advanced insulation resistance tests.
Evidence requirements
2.1
The need for temperature measurements and variation of insulation resistance
with temperature is explained.
2.2
Insulation resistance tests are performed.
Range
2.3
Specific tests are conducted.
Range
2.4
tests may include – power transformers, instrument transformers,
cables, low and high voltage switchgear, electrical installations,
electrical works, bushings, surge arrestors;
evidence of five different types of tests is required.
one minute spot checks, step voltage tests (two methods),
polarisation index tests.
Test results are analysed to determine the condition of equipment or identify
faults.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
20191 version 3
Page 3 of 3
31 December 2015
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
24 September 2003
Rollover and
Revision
2
20 June 2008
Review
3
8 December 2011
31 December 2012
31 December 2012
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 Electricity Supply Industry Training Organisation info@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016