JacksAvon
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| posted on 3/10/15 at 06:48 PM |
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Garage Electrics
Any domestic sparks in the house please.
I have a cable coming out of the household consumer unit.
It goes from there to its own RCD then through the wall to the outside.
From the RCD onwards this is an armoured cable.
I don't spend a lot of evenings in the garage but would like some electricity.
I am not great with the electric string so I have come up with a simple plan, if it will work.
I intend to wire the 3 core armoured cable into a 3 gang caravan extension which has a built in RCD then mount this in the garage.
Is this feasible?
Any help appreciated.
Jack
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coozer
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| posted on 3/10/15 at 07:09 PM |
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Yep, I have a single 2.5mm spur from the house going to a 2 gang RCD, one for my lathe, compressor, welder, devil saw etc and one for lights.
Been like that for donkeys years now, no problems.
1972 V8 Jago
1980 Z750
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daniel mason
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| posted on 3/10/15 at 07:48 PM |
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You should have some discrimination between the 2 rcd's which appear to be in line!
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JacksAvon
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| posted on 3/10/15 at 07:58 PM |
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Dan,
you have lost me
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coozer
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| posted on 3/10/15 at 08:02 PM |
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Ump, discrimination? Want do you mean?
My spur is off the upstairs ring main that's never used, we don't go upstairs enough.. Read 'white elephant loft
conversion'
RCD in the garage is the first line so any overload trips that without disrupting the house. Any overload on the spur, never yet as I can only use one
bit of kit at a time, will be protected by the house rcd.
Before I put the rcd in the garage I trip the house off a good few times..
1972 V8 Jago
1980 Z750
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mark chandler
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| posted on 3/10/15 at 08:05 PM |
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I ran an armoured cable to my shed, and terminated on switched 2 gang 32 amp RCD switch box, then ran two circuits, one for power the other for
lights.
When the sparky came around he terminated the armoured cable in an 'in/out' box to go to internal wiring, then ran this into the consumer
unit with a 16 amp RCD, he said as long as the consumer unit RCD was a lower rating than the shed then the sheds box it is treated as a switch.
[Edited on 3/10/15 by mark chandler]
[Edited on 3/10/15 by mark chandler]
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daniel mason
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| posted on 4/10/15 at 08:57 AM |
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Rcd's don't do overload protection,they are earth leakage devices!
basically you should get an electrician to do the work,but if adamant your doing it yourself then this is how it should be done!
How does the cable from the fuse board feed the armoured cable?
If it's not protected in a metal conduit or similar protective wiring system,or is not buried at least 50mm behind the finished wall surface
then it must be protected by an rcd!
If it's all an armoured cable all the way from the consumer unit to the garage then it doesn't and an mcb will do.
Descrimination is this. If the feed to the garage is fed via a 30ma rcd In The consumer unit in house then you put another 30ma trip in the garage. If
a fault occurs on the garage lighting (for example) then the house rcd could trip before the garage rcd as they both have the same rating.
The best way would be to run the whole sub main in armoured cable,straight back to the consumer unit with no rcd.then fit a 30ma trip in the garage
[Edited on 4/10/15 by daniel mason]
[Edited on 4/10/15 by daniel mason]
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JacksAvon
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| posted on 4/10/15 at 12:49 PM |
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Thanks chaps
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