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Topic Title: Earth Sizing for sub main Topic Summary: Created On: 15 August 2006 07:23 PM Status: Post and Reply |
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 15 August 2006 07:23 PM
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Hi, Am installing to two flats with meters in a hall cupboard,with regards to each flat I intend to install a 16mm submain as follows,there is 100amp supply, 25mm tails to 63amp switch fuse, then from here 16mm twin and earth to each flat consumer unit. Is the 10mm earth (in the t+e sufficient for the main earth or will a seperate 16mm earth need to be installed? Many thanks
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15 August 2006 07:30 PM
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"Is the 10mm earth (in the t+e sufficient for the main earth or will a seperate 16mm earth need to be installed?"
Are you sure 16 mm2 TW/cpc has 10 mm2 cpc? Doesn't it have 6 mm2? Regards BOD |
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15 August 2006 08:17 PM
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Bod you're right. 6242Y 16mm has 6mm CPC.
I remember an older standard of 16mm T&E that did have a 10mm CPC, and am sorry that it's no longer available. (Made certain bonding requirements easier to satisfy...) Any idea what type this stuff was ? The CPC was tinned copper I think, and the live conductor insulation may have been XLPE ??? 
------------------------- Regards Lee |
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15 August 2006 08:28 PM
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Im prob going over the top, but i would uses 3core 25mm SWA.
Dougie ------------------------- Dougie Power Plus Electrical.co.uk My mission is to live as long as possible......so far so good! |
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15 August 2006 11:41 PM
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SWA all the way.
T and E is rubbish at the best of times, as a sub main, i would avoid. 6mm cpc insufficeint IMHO. P ------------------------- ---------------------------------------- Lack of planning on your part doesn't make it an emergency on mine.... Every man has to know his limitations- Dirty Harry |
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15 August 2006 11:44 PM
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I would run a 10mm G\Y to be on the safe side from each 63a SFU. I would also fit a main cut out switch to isolate both flats at source.
Regards Ady ------------------------- Resistance is futile. |
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16 August 2006 03:35 PM
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Dougie
Why use 25mm SWA surely 16mm would be enough with a 63A fuse? Regards Graham |
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Earth Sizing for sub main
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