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Regulation 521.5.1 Electromagnetic effect

MarkE

We have an installation where a 3 phase and neutral circuit enters a metal enclosure, the circuit configuration is as follows

3 conductors per phase and neutral, heavy duty double insulated (non armoured) single core cables installed on ladder rack (free air), installed via a brass stuffing gland into a metal bus bar chamber.

Does this comply with Reg 521.5.1 and the regulations?

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  • 0

    installed via a brass stuffing gland

    Is that one (big) gland for all the cables, or many, one per cable?

    If the cables are going through different holes in a steel plate, then that strictly doesn't comply with 521.5.1. With thin plates and modest currents the effect is pretty minimal though  - and the DPC for AMD4 suggests there might soon be another exception for switchgear and controlgear assemblies conforming to BS EN IEC 61439 series and circuits carrying ≤200A.

      - Andy.

  • 0 in reply to AJJewsbury

    or the multiple holes can be converted to a single hole by slotting between them an infilling with a non-ferrous material (dog boning).

      - Andy.

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