S
Sparkydan
Does anybody know what table in the regs gives the size of armouring in mm when using the SWA as a CPC ? so i can write this in the circuit details on the installation cert.
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as far as i'm aware you are not supposed to rely on the armourings for the earth connection of SWA for installations. if there is no provision for earth in the cable you have run then you should run a seperate earth along the length of cable.
contract i'm on has swa from 2.5 2c upto 185 4c & 800mm 1c, only 3 cables have seperate cpc all of them are 50mm 4c
yours benji
I take your point, but if you run a SWA underground (say 3 core and each core is used as a line conductor) and someone goes though that with a saw, (seen it a few times when people have foundations dug out for a conservatory) then that cable will still be live, not trip the Protective device and becomes a hazzard to the poor bugger you grabs the end of it (if not already had a shock from saw). Where as if the Armour was earthed then the protective device would trip preventing the risk of shock.
The seperate earth would only provide an earth at the other end, but so does the armour. if the ends are terminated properley then there shouldnt be any moisture ingress, and the cable (inc earth continuity) should has as long as the installation
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