Recommended practices for protection of low-voltage electrical installations and equipment in MEN systems from transient overvoltages
Standards Australia
Recommends a simple system for the protection of electrical installations and connected equipment from transient voltages exceeding 2500 V due to lightning discharges and switching.
RECONFIRMATION NOTICE
Technical Committee EL-007 has reviewed the content of this publication and in
accordance with Standards Australia procedures for reconfirmation, it has been
determined that the publication is still valid and does not require change.
Reconfirmed documents cannot be amended, but may be formally revised and a new
edition published.
Certain documents referenced in the publication may have been amended since the
original date of publication. Users are advised to ensure that they are using the latest
versions of such documents as appropriate, unless advised otherwise in this
Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for
reconfirmation on 18 May 2015.
Reconfirmed documents cannot be amended, but may be formally revised and a new
edition published.
The following are represented on Technical Committee EL-007:
Ausgrid
Australian Industry Group
Energy Networks Association
Engineers Australia
The University of New South Wales
This Standard recommends a simple system of insulation coordination for nominal 240/415 V, 50 Hz electrical installations in multiple earthed neutral (MEN) systems to avoid damage to wiring and equipment due to transient voltages exceeding 2500 V caused by lightning discharges and switching. Circuits in some installations may be protected for lower overvoltages, but this is not dealt with in this Standard. (For guidance see AS 1768.) This Standard does not apply to the protection of installations from temporary overvoltages which could result from faults in the electricity supply system. It does not apply to the protection of equipment connected to both electricity supply and information technology services (e.g. telephone cables and TV antennas). Consideration needs to be given to a common earthing system for the protection of all electrical services.
NOTE: Reference should be made to AUSTEL mandatory Technical Standard 001 which specifies requirements for overvoltage protective devices in equipment to be connected to telecommunication networks. For most applications of this Standard, the telecommunication networks need not be taken into consideration. However, if connections are to be made between systems, or if both systems are enclosed in common ducts, the requirements of this Standard and AUSTEL mandatory Technical Standard 001 should be met. Reference should also be made to AS 3260.
| Document Type | Standard |
| Status | Current |
| Publisher | Standards Australia |
| ProductNote | Reconfirmed 18/05/2015. This standard as been reconfirmed in Australia in 2015 and remains current in New Zealand. Reconfirmation Notice 18/05/2015 |
| Committee | EL-007 |
| Supersedes |
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