BS 7769-1.1:1997
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Electric cables. Calculation of the current rating. Current rating equations (100% load factor) and calculation of losses General
Hardcopy , PDF
31-01-2007
English
15-08-2002
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Committees responsible
National foreword
Introduction
1 General
1.1 Scope
1.2 Normative references
1.3 Symbols
1.4 Permissible current rating of cables
2 Calculation of losses
2.1 AC resistance of conductor
2.2 Dielectric losses (applicable to a.c. cables only)
2.3 Loss factor for sheath and screen (applicable to
power frequency a.c. cables only)
2.4 Loss factor for armour, reinforcement and steel
pipes (applicable to power frequency a.c. cables
only)
Tables
1 Electrical resistivities and temperature
coefficients of metal used
2 Skin and proximity effects - Experimental values for
coefficients kx and kp
3 Values of relative permitivity and loss factors
for the insulation of high-voltage and
medium-voltage cables at power frequency
4 Absorption coefficient of solar radiation for
cable surfaces
Applicable to steady-state operation of cables at all alternating voltages and direct voltages up to 5 kV, buried as well as in air. This section provides formulae for current ratings and losses.
| Committee |
GEL/20/16
|
| DevelopmentNote |
Supersedes 97/200610 DC & 99/242702 DC. (09/2002)
|
| DocumentType |
Standard
|
| Pages |
32
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| BS 7888-2:1998 | LV and MV accessories for power cables with rated voltage from 0.6/1 kV (<i>U</i><sub>m</sub>=1.2 kV) up to and including 20.8/36 kV (<i>U</i><sub>m</sub>=42 kV) Methods of test |
| BS 7671(2008) : 2018 | REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS |
| BS 7769-2.2:1997 | Electric cables. Calculation of the current rating. Thermal resistance A method for calculating reduction factors for groups of cables in free air, protected from solar radiation |
| BS 7671(2008) : 2008 | REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS |
| IEC 60028:1925 | International standard of resistance for copper |
| IEC 60228:2004 | Conductors of insulated cables |
| IEC 60502:1994 | Extruded solid dielectric insulated power cables for rated voltages from 1 kV up to 30 kV |
| IEC 60889:1987 | Hard-drawn aluminium wire for overhead line conductors |
| IEC 60183:2015 | Guidance for the selection of high-voltage A.C. cable systems |
| IEC 60228A:1982 | First supplement - Conductors of insulated cables - Guide to the dimensional limits of circular conductors |
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