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Title / Demonstrate knowledge of electrical circuit protection devices for power cables
Level / 3 / Credits / 2
Purpose / This unit standard is intended for cable jointers in the electricity supply industry.
People credited with this unit standard are able to demonstrate knowledge of electrical circuit protection devices for power cables.
Classification / Electricity Supply > Electricity Supply - Distribution Networks
Available grade / Achieved
Explanatory notes
1 This unit standard is intended for, but not restricted to, workplace assessment. The range statements within the unit standard can be applied according to enterprise specific equipment, procedures and processes.
2 Performance and work practices in relation to the outcomes and evidence requirements must comply with all current legislation, especially the ElectricityAct1992 and any subsequent amendments, and any regulations, codes of practice recognised under that statute, 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 latest versions of, Safety Manual – Electricity Industry (SM-EI) Wellington: Electricity Engineers’ Association.
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.
5 LV is defined as ‘low voltage’ and includes voltages up to and including 1000 volts ac. and HV is defined as ‘high voltage’ and includes voltages above 1000 volts a.c.
6 This unit standard is intended for use in the assessment of cable jointers, and all terminology should be related to that sector of the industry.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of electrical circuit protection devices for power cables.
Evidence requirements
1.1 The need for circuit protection in power cables is explained.
Range cable ampacity, conductor insulation, circuit isolation, overloads and short circuits.
1.2 Protection devices used in power cables are described with the aid of drawings showing construction and operating principles in simple terms.
Range devices (high voltage HV and low voltage LV) – re-wirable fuses, open fuses, liquid fuses, high rupturing capacity (HRC) fuses, fusible links, HV expulsion fuses (EDO), circuit breakers (oil filled, gas, vacuum), protection relays (voltage, current, differential, phase-failure, directional), auto-reclosers;
evidence of three is required.
1.3 Fuse link types used in power cables are identified physically and by product references.
Range at least three different types.
1.4 Dangers around replacement of fuse links are explained.
Range electrical and or thermal burns, electric shock, arc blast.
Planned review date / 31 December 2019Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for Assessment /Registration / 1 / 18 September 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 if you wish to suggest changes to the content of this unit standard.
Infrastructure ITOSSB Code 101813 / Ó New Zealand Qualifications Authority 2014