Discuss Swa armour earthing in the UK Electrical Forum area at ElectriciansForums.net
Can anyone point me in the right direction as to find the size of conductor to earth the armour of swa? It's not being used as the cpc on the circuit it's 25mm 3core. I'm always trying to find this when I'm terminating armoured cable!! Thanks
Is that not in the table?? or am i having a blonde moment here... lol
Yes, but you need to make sure that the equivalent of the armour CSA, in copper CSA is what you need it to be.
Thanks for the links, I don't want to use the armour as the earth I mean the size of the flyleads to earth the different sizes of cable.....
from what i can gather from the OP, he's asking what size conductor should be used to earth the armour when the armour is NOT being used as cpc. i always try and use the same size as the cpc.up to 10mm. i.e. if it's a 6mm 3 core cable. i would use a 6mm fly lead to earth the armour of the SWA. ( assuming it's glanded into an insulated enclosure)
agreed, the armour will become cpc ( or part thereof ) if connected at the downstream end, but not if it is only earthed at the source end to comply with being an earthed metallic sheath.
Thanks for the response guys, I have been taught that the armour is ok to use as the cpc relevant to size, I just have a 3core cable in the ground so using the 3rd core for my earth. In my situation I have stripped the three cores so they gland off and pass through an adaptable box to the consumer unit.
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