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Topic Title: Submains from TT supply Topic Summary: Created On: 04 December 2012 01:48 PM Status: Post and Reply |
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 04 December 2012 01:48 PM
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Hi chaps.
I need to run a supply to a new house which has just been built from a new TT supply which is located in small shed roughly 15 meters from the house. I intent to run a 16mm 2 core swa from source using a 63A 100ma time delayed RCD. Inside the house we intend to gland the swa into a plastic adaptable box, then run the inner cores to the D.B. From the D.B. we intend to run a piece of 10mm earth via a small duct outside to a stake. D.B. will obviously be a split load 17th jobby, so all circuits will be 30ma protected. Does that sound ok? Cheers in advance. |
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04 December 2012 01:52 PM
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How is the armour earthed ? - ie which end and which RCD - will you have an electrode at the shed end ?
Regards OMS ------------------------- Failure is always an option |
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04 December 2012 02:12 PM
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The armour will be earthed at the supply end in the shed from the existing db, it has it's own stake. I believe there is already a submains feeding a caravan, so it's in use.
Sorry what do you mean by which RCD? Make or type? |
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04 December 2012 02:23 PM
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I haven't had a close look at the supply db as yet.
But I was thinking something along the lines of somehow coming out the non RCD side of the db if possible or using Henley blocks, to feed a little consumer unit with a 100ma type s RCD main switch with a 63A mcb for overload protection. Or there maybe even a 100ma RCD main switch in the existing db, in which case could I just use 63A mcb inside the db and just gland my swa straight in? My next visit is in a months time!! |
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04 December 2012 02:29 PM
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The armour will be earthed at the supply end in the shed from the existing db, it has it's own stake. I believe there is already a submains feeding a caravan, so it's in use. OK - not clear in your OP Sorry what do you mean by which RCD? Make or type? Which one rather than make or type - in the absense of knowing about the source end electrode, I thought you were going to earth the armour to the house end stake Regards OMS ------------------------- Failure is always an option |
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04 December 2012 02:31 PM
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I haven't had a close look at the supply db as yet. But I was thinking something along the lines of somehow coming out the non RCD side of the db if possible or using Henley blocks, to feed a little consumer unit with a 100ma type s RCD main switch with a 63A mcb for overload protection. I'd use henley blocks - sometime the caravan supply will get ditched I guess Or there maybe even a 100ma RCD main switch in the existing db, in which case could I just use 63A mcb inside the db and just gland my swa straight in? You could - but see above My next visit is in a months time!! All be revealed then 
Regards OMS ------------------------- Failure is always an option |
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04 December 2012 02:43 PM
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Thanks oms
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Submains from TT supply
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