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ENA NENS 04-2006

Current
Current

The latest, up-to-date edition.

National guidelines for safe approach distances to electrical and mechanical apparatus
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

06-21-2006

Publisher

Energy Networks Australia

Preview

1 -  ENA NENS 04-2006 NATIONAL GUIDELINES FOR SAFE APPROACH DISTANCES TO ELECTRICAL AND MECHANICAL APPARATUS
4 -  CONTENTS
 5 -  1 PREFACE
 6 -  2 OBJECTIVES
 6 -  3 SCOPE
 7 -  4 DEFINITIONS
 8 -  5 METHODOLOGY
8 -  5.1 General
 10 -  5.2 Authorised Persons, Instructed Persons and Ordinary Persons
 10 -  5.3 Power frequency
 10 -  5.4 Switching surge
 11 -  5.5 Risks excluded
 12 -  6 SAFE APPROACH DISTANCES
12 -  6.1 Safe Approach Distance for Ordinary Persons
 13 -  6.2 Safe Approach Distances for Instructed or Authorised Persons
 14 -  6.3 Safe Approach Distance-Special Limit of Approach for Authorised Persons Only
 14 -  6.4 Safe Approach Distances for Mobile Plant Operated by Ordinary Persons
 15 -  6.5 Safe Approach Distances for Mobile Plant Operated by Instructed or Authorised Persons
 16 -  6.6 Safe Approach Distances for Vehicles Operated by Ordinary Persons
 17 -  6.7 Safe Approach Distances for Vehicles Operated by Instructed or Authorised Persons
 18 -  6.8 Scaffolding
 18 -  7 FACTORS TO CONSIDER IN VARYING SAFE APPROACH DISTANCES
19 -  7.1 Increases to Safe Approach Distances
 19 -  7.2 Decreases to Safe Approach Distances-Determination of Special Limits for Authorised Persons Only
20 -  7.2.2 Risk Assessments for Developing Safe Approach Distances-Special Limit for Authorised Persons Only
 20 -  7.2.3 Safety Observers
 21 -  7.2.4 Mobile plant
 21 -  7.3 Variation of calculated electrical withstand distance
21 -  7.3.1 Maximum overvoltage
 21 -  7.3.2 Weather conditions
 22 -  ANNEX A - BASE ASSUMPTIONS FOR FLASHOVER DERIVATIONS
22 -  A1 GENERAL
 22 -  A2 DERIVATION OF POWER FREQUENCY FLASHOVER
 22 -  A3 DERIVATION OF SWITCHING SURGE WITHSTAND DISTANCE
 23 -  A4 DERIVATION OF D.C. AIR GAP DISTANCES
 24 -  ANNEX B - DERIVATION OF SAFE APPROACH DISTANCES FOR INSTRUCTED OR AUTHORISED PERSONS
24 -  B1 PERSONAL APPROACH
 25 -  B2 MOBILE PLANT
 27 -  ANNEX C - SAMPLE SAFE APPROACH DISTANCE CALCULATIONS
 33 -  ANNEX D - TYPES OF PERSONS AND TYPICAL ATTRIBUTES FOR PERSONS TO WORK ON OR NEAR ELECTRICAL APPARATUS
 35 -  ANNEX E - REFERENCED DOCUMENTS

These Guidelines are intended to—
(a) Support the Electricity Supply Industry in ensuring the safety of electrical and other
workers and the general public by the development of appropriate Safe Approach
Distances to electrical apparatus for various classes of persons, and mobile plant and
equipment.
(b) Provide the basic technical material necessary for Network Operators to develop
work practice, and related training and awareness programs.
(c) Provide recommendations for appropriate Safe Approach Distances for members of
the general public.
(d) Provide the Electricity Supply Industry with a sound basis for controlling activities,
where possible, of the general public near network assets.

These Guidelines apply to all work on or near electrical apparatus managed by Network Operators, but excluding:
high voltage live work;
work on electrical apparatus which is isolated and earthed and covered by a Network Operator’s Access Authority;
work on electrical installations complying with AS/NZS 3000; and
extra low voltage work.
These Guidelines should be applied in the context that-
(i) Appropriate workplace hazard and risk assessments are carried out as required.
(ii) The Safe Approach Distances used are appropriate for the type of person, training and work to be performed.
(iii) Other Guidelines applicable to particular work processes such as vegetation management are to be used.

DocumentType
Misc Product
ISBN
0-7337-7519-5
Pages
31
PublisherName
Energy Networks Australia
Status
Current

First published as ESAA NENS 04-2003.
Redesignated as ENA NENS 04-2006.

AS/NZS 7000:2010 Overhead line design - Detailed procedures

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Hardcopy - English
PDF - English
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