Wonder if anyone can help. Have moved into house and found a radial feed to my garage which is 4mm2 twin and earth in a 20mm dia steel conduit. It's about 600mm deep and when it enters the house, goes to a plastic junction box under the floor and then the to the CU (without the conduit. Does the outside cable need to be changed to swa?
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- Thread starter densi2
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Wonder if anyone can help. Have moved into house and found a radial feed to my garage which is 4mm2 twin and earth in a 20mm dia steel conduit. It's about 600mm deep and when it enters the house, goes to a plastic junction box under the floor and then the to the CU (without the conduit. Does the outside cable need to be changed to swa?Sponsored Links
no need to replace with SWA, T&E in earthed metal conduit is perfectly fine, which brings us onto the next point, you should ensure that the conduit is indeed earthed, the part about a plastic junction box bothers me... a picture of this juntion box might be useful (with the cover removed)
IF you can absolutely guarantee that the conduit is 100% watertight.Adam_151 said:
If it's not, and the T/E ends up immersed in water, it's far from perfectly fine....
Thanks for the replies, I cant get a photo but the wiring is just a straight connection of live to live, earth to earth and neutral to neutral. Is it possible to put an earth clamping strap on the conduit and connect this to the earth from the CU. if so, what size of earth cable should be used.The conduit is sealed at the garage end and there is no sign of water infiltration at the house end.
On a different topic, does Part P apply to Scotland?
Thanks again.
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densi2 said:
No but time will tell.
I'd earth the conduit by terminating the end of it in a galvonised adaptable box, make sure the joint is all clean and tight, bring the cable that goes to the CU into the adaptable box through appropiate grommit or flat cable gland, bend the cpc over and trap it in the earthing point for the box nice and tight without cutting it*(remember to apply sleeving to it) and then crimp the incomming cores to the outgoing cores using correct size crimps applied with a rachet action crimping tool
* or crimp a 'hoop' connector on it and bolt it to the side of the box with brass bolt
* or crimp a 'hoop' connector on it and bolt it to the side of the box with brass bolt
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