• 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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    Electric cables. Calculation of the current rating. Current rating equations (100% load factor) and calculation of losses General

    Available format(s):  Hardcopy, PDF

    Superseded date:  31-01-2007

    Language(s):  English

    Published date:  15-08-2002

    Publisher:  British Standards Institution

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Committee GEL/20/16
    Development Note Supersedes 97/200610 DC & 99/242702 DC. (09/2002)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS 7888-2:1998 LV and MV accessories for power cables with rated voltage from 0.6/1 kV (Um=1.2 kV) up to and including 20.8/36 kV (Um=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

    Standards Referencing This Book - (Show below) - (Hide below)

    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
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective