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Electrical supply to garage...???

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Old 08 January 2007, 01:33 PM   #1
Dazza's-STi
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Question Electrical supply to garage...???

Need some info as to what the regs are to supply the garage with electric.. Its about 30m from the mains dis board at the front of the house so the question is, what size SWA cable do i need, and how deep does it have to be... Bearing in mind there's no vehicle access where the cable will be...

Ta in advance
Daz
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Old 08 January 2007, 01:49 PM   #2
John@TunerUK
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It will need to be protected by an RCD, and you will need a Part P approved sparky to do the work. You can dig your own trench though. That'll save you some dough. I'll have to double check the regs, but I'd go at least a foot down, preferably 2 foot.
The SWA cable needed depends on what you intend to have in the garage though, so make a list and I can let you know
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Old 09 January 2007, 09:39 AM   #3
cogin
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as above, you cold also run over head on a catenery wire to save on the digging!!

If you need big power out there then you is looking at 10mmSQ cable feed for RCDprotected 45Amp fuse for that distance, you'll also need a consumer to go in the garage.

You can get a lot of the parts you need for screwfix alot cheaper than a sparky but he will still need to do the work and give you a certificate, this is the important bit!!!
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Old 09 January 2007, 09:50 AM   #4
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You can do the work yourself, you do not need to be part p approved. To stay legal you will need to get the installation inspected by building control.
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Old 09 January 2007, 10:25 AM   #5
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this is true, but depending on you local athority you may have to notify before you start work, this can be a long process because it follows the same routes as other building regs, certanly the case with mine, slow anit the word, find a local sparky who will let you supply the parts and do most of the work.
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Old 09 January 2007, 01:15 PM   #6
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The depth is IIRC

600mm with the trench layered with sand and warning tapes

or

400mm with the trench layered with sand and warning tapes - if it is under a pathway etc. e.g. slabs.

If I get a chance I'll look up the regs later.

John
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Old 09 January 2007, 01:27 PM   #7
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450mm AFAIK..

10mm over 30m cannot be fused at 45A.

I suggest you look to calculate voltage drops.

If you dont know how to terminate armoured cable, I would suggest you dig the trench and call a sparky.

David
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Old 09 January 2007, 01:28 PM   #8
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Or give us a shout if you want a hand as you are local

Ive also got contacts for cheap supplies
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Old 09 January 2007, 02:26 PM   #9
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Quote:
10mm over 30m cannot be fused at 45A.
If Ze < 0.35 ohm on TN-C-S system maximum length is 49 meters to maintain 0.4second disconection time.

If Ze < 0.8 ohm on TN-S system maximum length is 35 meters to maintain 0.4second disconection time.

If thats still a problem go with 16mm on a 40A MCB via RCD and your run length is 88meters and 78meters respectivly.

If its a TT system lengths are the same for TN-S but all circuits must be RCD protected.

Last edited by cogin; 09 January 2007 at 02:33 PM.
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Old 09 January 2007, 02:36 PM   #10
David_Wallis
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Thats true enough, but what about the almost stupid voltage drop calcs..

David
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Old 09 January 2007, 02:40 PM   #11
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forget that, my calc was wrong!!
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Old 10 January 2007, 07:00 PM   #12
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just had my garage re wired, this is how i had it. I've enough power for anything extra I want to add in the future.
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Old 13 January 2007, 07:18 PM   #13
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Quote:
Originally Posted by David_Wallis View Post
450mm AFAIK..


David

Finally got round to checking the regs;
According to the 16th Edition (Third Edition)

There are no specific requirements given to the required depth.
But as a guideline 400mm is mentioned for under a hard standing e.g. slabs/driveway but up to 700mm is recommended if the cable will be in an area where it is possible digging would occur.
Once again remember the hazard warning tapes etc.

John
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