Nzqa registered unit standard 23898 version 2




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NZQA registered unit standard

23898 version 2




Page of




Title

Carry out polarity and phasing on LV electricity networks

Level

3

Credits

2




Purpose

People credited with this unit standard are able to carry out: polarity tests and connections; and phasing tests and connections in low voltage (LV) electricity networks to comply with regulations and conventions.




Classification

Electricity Supply > Electricity Supply - Core Skills




Available grade

Achieved


Explanatory 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.
3 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 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 outcomes and evidence requirements 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.
Outcomes and evidence requirements
Outcome1
Carry out polarity tests and connections to comply with regulations and conventions.
Evidence requirements
1.1 Polarity terms are described.
Range low voltage, naming of conductors, conductor identification and colours, neutral conductors, live conductors.
1.2 Reasons for correct supply polarity in LV systems are described.
Range safety (to life and property), prevention of risk of exposure to shock and fire damage, live conductors to be switched, neutral conductors at ‘O’ or earth potential, commissioning and re-commissioning of equipment.
1.3 The effects of incorrect polarity, high impedance neutral and open circuit neutral in a LV installation are described.
Range phase – neutral reversal, voltage to remote earth, rise of earth potential, fluctuations in supply, voltage with change of load.
1.4 Methods for testing polarity in LV systems are demonstrated.
Range voltage measurement to a remote earth, measurement of current in phase, neutral and earthing lead conductors, continuity measurements to identify conductors.
1.5 Changing polarity connections is demonstrated.
Outcome 2
Carry out phasing tests and connections in LV networks to comply with regulations and conventions.
Evidence requirements
2.1 Phasing terms are described.
Range includes but is not limited to – vector grouping of transformers, phase marking and identification of conductors (R, W, B, A, B, C).
2.2 Purpose of phasing checks is described.
Range paralleling supplies and transformers, reconnection of conductors (cables and overhead) after repair, commissioning new equipment and re-commissioning after repair, phase rotation of supplies.
2.3 Methods for testing of phasing in LV systems are demonstrated.
Range use of phasing phones, continuity tests, recording of voltage readings following ‘prove-test-prove’ technique.



Replacement information

This unit standard and unit standard 23899 replaced unit standard 18029.




Planned review date

31 December 2012


Status information and last date for assessment for superseded versions

Process

Version

Date

Last Date for Assessment

Registration

1

25 October 2007

N/A

Revision

2

15 September 2011

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



Ó New Zealand Qualifications Authority 2016





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