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BS EN IEC 61472-2:2021

BS EN IEC 61472-2:2021

$102.76

Live working. Minimum approach distances – Method of determination of the electrical component distance for AC systems from 1,0 kV to 72,5 kV

Published By Publication Date Number of Pages
BSI 2021 22
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IEC 61472-2:2021 specifies a method for determining the electrical component of the minimum approach distances for live working, for AC systems 1 kV up to and including 72,5 kV. This document addresses system overvoltages and the working air distances between equipment and/or workers at different potentials. The withstand voltage and minimum approach distances determined by the method described in this document can be used only if the following working conditions prevail:

  • workers are trained for, and skilled in, working live lines or close to live conductors or equipment;
  • the operating conditions are adjusted so that the statistical overvoltage does not exceed the value selected for the determination of the required withstand voltage;
  • transient overvoltages are the determining overvoltages;
  • tool insulation has no continuous film of moisture present on the surface;
  • no lightning is observed within 10 km of the work site;
  • allowance is made for the effect of the conducting components of tools.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 European foreword
Endorsement notice
7 English
CONTENTS
8 FOREWORD
10 1 Scope
2 Normative references
3 Terms and definitions
11 4 Minimum approach distance, DA
12 5 Factors influencing the minimum approach distance
5.1 Control of system overvoltages
5.2 Statistical overvoltage
13 5.3 Conductive floating object
5.4 Insulators
5.5 Determination of minimum electrical distance, DU
6 Example calculation
14 Table 1 – Distance for rod-to-rod gap from IEEE 516-2009
Table 2 – Phase-to-earth electrical distance for system voltagesfrom 1,0 kV up to and including 72,5 kV, ue2 = 3,5
15 Table 3 – Phase-to-phase electrical distances for system voltagesfrom 1,0 kV up to and including 72,5 kV, up2 = 5,2
16 Annex A (informative)Overvoltages
A.1 General
A.2 Highest voltage of a system
A.3 Temporary overvoltage
17 A.4 Transient overvoltage
A.4.1 General
A.4.2 Switching overvoltage
18 A.4.3 Lightning overvoltages
19 Annex B (informative)Ergonomic considerations
B.1 General
B.2 Training, knowledge and skill
B.3 Protective barriers
B.4 Possibility of error
B.5 Work procedure
20 B.6 Personal factors
B.7 Monitoring
21 Bibliography

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BS EN IEC 61472-2:2021
$102.76