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S.W.A. Armour Earthing.

Which regulations(s) require the steel wire armouring of a S.W.A. cable to be earthed if it is NOT used as a circuit protective conductor?


Case 1. Cable buried underground.


Case 2. Cable NOT buried underground.


Z.
Parents
  • lyledunn:

    I am confused! So this “filler” that surrounds the wire armour is of insufficient construction to regard the wire armour as not being an exposed conductive part. OK, let’s accept that argument, so it is an exposed conductive part. Does that mean that we have an issue with all those early EVSE points wired in SWA with the wire armour connected to the PME terminal but separated from the TT earth at the EVSE as we are breaching 411.3.1.1? 


    I think the  "filler" surrounds the insulated live conductors of S.W.A. cable. Recent comments appear to be considering the possibility of an INTERNAL cable breakdown between live conductors and armouring,  rather than the obvious EXTERNAL causes.


    The "filler" is the cream/grey coloured insulation shown in the image below covering the insulated  live conductors. The cables are though rated at 600/1000 Volts which says something.

    https://www.electricalcounter.co.uk/custom/upload/attachments/products/1/cab_6943x_1.pdf


    Z.


Reply
  • lyledunn:

    I am confused! So this “filler” that surrounds the wire armour is of insufficient construction to regard the wire armour as not being an exposed conductive part. OK, let’s accept that argument, so it is an exposed conductive part. Does that mean that we have an issue with all those early EVSE points wired in SWA with the wire armour connected to the PME terminal but separated from the TT earth at the EVSE as we are breaching 411.3.1.1? 


    I think the  "filler" surrounds the insulated live conductors of S.W.A. cable. Recent comments appear to be considering the possibility of an INTERNAL cable breakdown between live conductors and armouring,  rather than the obvious EXTERNAL causes.


    The "filler" is the cream/grey coloured insulation shown in the image below covering the insulated  live conductors. The cables are though rated at 600/1000 Volts which says something.

    https://www.electricalcounter.co.uk/custom/upload/attachments/products/1/cab_6943x_1.pdf


    Z.


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