AS 60099.4:2022

Table of cotents

AS 60099.4 was prepared by the Australian members of the Joint Standards Australia/Standards
New Zealand Committee EL-007, Power Switchgear, to supersede AS 1307.2—1996, Surge arresters,
Part 2: Metal-oxide surge arresters without gaps for a.c. systems.
After consultation with stakeholders in both countries, Standards Australia and Standards New
Zealand decided to develop this document as an Australian Standard rather than an Australian/New
Zealand Standard.
The objective of this document is to present the minimum criteria for the requirements and testing
of nonlinear metal-oxide resistor type surge arresters without spark gaps, designed to limit voltage
surges on a.c. power circuits with Us above 1 kV.
This document is an adoption with national modifications, and has been reproduced from, IEC 60099-
4:2014, Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c. systems.
The modifications are additional requirements and recommendations and are set out in Appendices ZZ
to ZI, which have been added at the end of the source text.
Appendix ZZ lists the variations to IEC 60099-4:2014 for the application of this document in Australia.
Appendix ZA specifies spark production class for gapless distribution arresters.
Appendix ZB specifies tests for the verification of spark production class.
Appendix ZC specifies a multi-pulse lightning impulse current operating duty test for
distribution arresters.
Appendix ZD reproduces a paper which provides information about fire ignition by electrically
produced incandescent particles.
Appendix ZE reproduces a paper which provides information about fire ignition by copper particles of
controlled size.
Appendix ZF reproduces a paper which provides information about spark detection under short-circuit
testing conditions.
Appendix ZG specifies additional requirements for the identification and classification of
distribution arresters.
Appendix ZH provides additional information that is to be given with enquiries and tenders.
Appendix ZI provides a test to determine the safety of arrester configurations using
overvoltage conditions.
As this document has been reproduced from an International Standard, the following applies:
(a) In the source text “this part of IEC 60099” should read “this document”.
(b) A full point substitutes for a comma when referring to a decimal marker.
Australian or Australian/New Zealand Standards that are identical adoptions of international
normative references may be used interchangeably. Refer to the online catalogue for information on
specific Standards.
The terms “normative” and “informative” are used in Standards to define the application of the
appendices or annexes to which they apply. A “normative” appendix or annex is an integral part of a
Standard, whereas an “informative” appendix or annex is only for information and guidance.