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 Post subject: SWA cable to workshop
PostPosted: Mon Oct 17, 2005 2:13 pm 
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Hi Folks,

I'm going to be wiring up my workshop soon but I'm a little uncertain about what size armoured cable to run to it.

There shouldn't be anything other than the usual power tools being used and mostly only one of them at a time. I was going for 2 32A MCB ring circuits and a lighting circuit

The distance from the house to the workshop is about 20 metres. Is there a formula for working out the thickness of cable?

Thanks


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PostPosted: Mon Oct 17, 2005 4:56 pm 
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Hi Chris,

Welcome to the forum!

I am not a qualified electrician and I am unable to give specific electrical advice as to which is the correct thickness of cable to use.

I always air on the side of caution and use a thicker wire than is necessary, for example I recently wired a shower (before part P) and the guy in the shop said that I could use 6mm Twin core and earth, I chose to use 10mm twin core and earth as it makes it a lot easier, should I wish to upgrade the shower in the future.

There is a formula that can work out the thickness of the cable to be used and this will involve diversification.

There is a cable size selection calculator on the TLC direct site-

http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

This is for guidance only but will give you a rough Idea, I have just tried the calculator for 5kw, which recommends 2.5mm and I also tried 10kw which recommended 6mm wire. I would say that 5kw would be a more realistic figure unless you are using some major power tools.

I would recommend getting the cable from a dedicated electrical shop and get the advice from the guys in the shop as these are normally qualified electricians themselves.

Hope this helps a little!

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PostPosted: Tue Oct 18, 2005 10:58 am 
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Thanks. I'll give it a try :D


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