BS 7454:1991
Method for calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects

Standard No.

BS 7454:1991

Release Date

1991

Published By

British Standards Institution (BSI)

Status

Be replaced 1991-04

Replace By

BS 7454:1991+A1:2008

Latest

BS 7454:1991+A1:2008

Scope

Method for Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects Committees responsible National foreword Method Introduction 1 List of symbols 2 Permissible short-circuit current 3 Calculation of adiabatic short-circuit current 4 Calculation of short-circuit temperature 5 Calculation of non-adiabatic factor for conductors and spaced wire screens 6 Calculation of non-adiabatic factor for sheaths, screens and wires Appendix A Explanation of recommended methods for taking into account non-adiabatic heating effect when calculating permissible short-circuit currents Tables 1 Untitled 2 Thermal constants of materials 3 Constants for use in the simplified formula for conductors and spaced wire screens Figure 1 Non-adiabatic factor (e) for sheaths, screens and armour

BS 7454:1991 history

• 1991 BS 7454:1991+A1:2008 Method for calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects
• 1991 BS 7454:1991 Method for calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects