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table 4d5

  1. eveares

    Installation Reference Method for T&E cable running through joists with no thermal insulation? (Lacking from table 4D5 in BS7671)

    Say you had a cable running horizontally through floor joists without any thermal insulation (assuming horizontal cable support requirements were met), how is one supposed to know how much to de-rate the cable by and what the de-rated current carrying capacity is for a given conductor size...
    • eveares
    • Thread
    • bs7671 cable derating installation reference method joists table 4d5
    • Replies: 12
    • Forum: Electrics UK
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