NZQA registered unit standard 28279 version 1 Page 1 of 3

Title Demonstrate knowledge of electrical protection principles and the effects of faults on distribution networks

Level 4 Credits 4

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 terms and fuse link operating principles; and the effects and causes of faults on distribution networks.

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 Electricity Act 1992 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 the 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.

Infrastructure ITO Ó New Zealand Qualifications Authority 2018 SSB Code 101813 NZQA registered unit standard 28279 version 1 Page 2 of 3

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 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 terms and fuse link operating principles.

Evidence requirements

1.1 Circuit protection terms are explained.

Range may include but is not limited to – current rating, voltage rating, utilisation category, interrupting capacity (breaking capacity), fusing and tripping factor, excess current protection (coarse and close), prospective short circuit current (pscc), discrimination, co- ordination; evidence of four is required.

1.2 The arc extinguishing and operating principles of fuse elements is explained.

Range may include but is not limited to – expulsion fuse, high rupturing capacity fuse (HRC), liquid fuse link; evidence of two is required.

1.3 Relationship between current rating, interrupting capacity and utilisation category for a protection device is stated and explained.

Outcome 2

Demonstrate knowledge of the effects and causes of faults on distribution networks.

Evidence requirements

2.1 The causes of faults on distribution networks are explained.

Range includes but is not limited to – insulation breakdown, leakage current, over current, short circuit, physical damage, bird strike, fallen tree, possums, accidents, lightning strikes and switching surges.

2.2 The effects of faults on network primary and secondary equipment are explained.

Infrastructure ITO Ó New Zealand Qualifications Authority 2018 SSB Code 101813 NZQA registered unit standard 28279 version 1 Page 3 of 3

Range includes but is not limited to – damage to cables, conductors, equipment due to overheating or mechanical forces or magnetic forces, non-operation of protection equipment during faults and accidents.

2.3 Importance of time in relation to the isolation of faults is explained.

2.4 The purpose and function of an auto-recloser and sectionalisers, and where they are located in the electricity distribution networks, are described.

Planned review date 31 December 2019

Status 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 [email protected] if you wish to suggest changes to the content of this unit standard.

Infrastructure ITO Ó New Zealand Qualifications Authority 2018 SSB Code 101813