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Title / Install and commission voltage transformer metering in the electricity supply industry
Level / 4 / Credits / 12
Purpose / People credited with this unit standard are able to: demonstrate knowledge of the design and application of voltage transformers (VT) utilised in revenue metering; determine VT ratio and class of operation; determine VT installation integrity; install and commission VT metering equipment; and report VT installation and commission results.
Classification / Electricity Supply > Electricity Supply - Metering
Available grade / Achieved
Explanatory notes
1This 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.
2Safety 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.
3Performance 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) (2004) Wellington: Electricity Engineers’ Association. A full list of current legislation and industry codes is available from the Infrastructure ITO, PO Box 2759, Wellington 6140.
4‘Industry requirements’include all industry and workplace documented policies, procedures, specifications, business, and quality management requirements relevant to the workplace in which assessment is carried out.
5Practical exercises should be used for training and assessment wherever possible.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the design and application of VT utilised in revenue metering.
Evidence requirements
1.1The types of VT are described in accordance with industry requirements.
Rangeincludes but is not limited to – single-phase, three-phase three limb, three-phase five limb, capacitive voltage transformers.
1.2The design, application and use of VT are described in accordance with industry requirements.
Rangeincludes but is not limited to – design and application of voltage transformers in both two and three element metering, ratios, burden ratings, class of operation, primary and secondary earthing, polarity and phasing, terminations and test blocks.
1.3Multipliers and compensation for VT ratios are described in accordance with industry requirements.
1.4The limitations of multiple devices connected to VT circuits are described in accordance with industry requirements.
Rangeincludes but is not limited to – secondary burden, VT accuracy.
1.5VT secondary short circuit dangers and precautions are described in accordance with industry requirements.
Outcome 2
Determine VT ratio and class of operation.
Evidence requirements
2.1VT ratios are selected in accordance with industry requirements.
2.2VT class of operation is determined in accordance with industry requirements.
Outcome 3
Determine VT installation integrity.
Evidence requirements
3.1Required loadings are captured in accordance with industry requirements.
3.2Access to equipment is checked in accordance with industry requirements.
Rangeincludes but is not limited to – sealing of equipment, tampering devices.
3.3VT installation integrity is determined and recorded in accordance with industry requirements.
Rangemay include but is not limited to – safety, design criteria upheld, documentation, insulation determination, winding resistance, earthing requirements.
3.4Equipment mounting and positioning is checked in accordance with industry requirements.
Rangeincludes but is not limited to – secure mountings, electrical clearances, terminal safeguarding and shrouds.
Outcome 4
Install and commission VT metering equipment.
Evidence requirements
4.1VT metering equipment is installed in accordance with industry requirements.
Rangemay include but is not limited to – VT mounting, primary earthing, secondary earthing, secondary wiring and sealing, primary fusing,
secondary fusing.
4.2VT metering equipment is commissioned in accordance with industry requirements.
Rangeincludes but is not limited to – polarity tests, phasing tests, burden measurements, load checks (prevailing), ratio checks, insulation resistance measurement, phase angle measurement.
Outcome 5
Report VT installation and commission results.
Rangemay include but is not limited to – job sheet, installation reports and results.
Evidence requirements
5.1Reported information is completed and processed in accordance with industry requirements.
5.2Installation and commissioning information is recorded in the required format and filed within the scheduled time-frame in accordance with industry requirements.
5.3Further action required for plant and equipment is identified, recorded, and communicated to appropriate personnel in accordance with industry requirements.
This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 27 May 2002 / 31 December 2019
Revision / 2 / 10 September 2004 / 31 December 2019
Rollover and Revision / 3 / 23 April 2007 / 31 December 2019
Review / 4 / 20 July 2017 / 31 December 2019
Consent and Moderation Requirements (CMR) reference / 0120
This CMR can be accessed at
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.
Infrastructure ITOSSB Code 101813 / New Zealand Qualifications Authority 2018 / / New Zealand Qualifications Aut