Safe to Swap a Junction box for a Socket in a new Build Property?


Postby Damouk » Sun Aug 27, 2017 10:34 am

I live in a new build house where the developers contractors have installed a junction box on the outside wall of my house that takes a feed from the consumer unit "Garage" RCD, and joins it to an underground cable that takes the power to my garage for lighting and sockets. What I would like to do is simply swap that junction box out for an outdoor socket, so the power uses the socket internal wiring as the junction box, and I can then plug devices into the socket like lawnmowers. Is that safe/permissable?
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Postby ericmark » Sun Aug 27, 2017 8:28 pm

Depends on size of supply and cable size and where the RCD is.

A socket will normally take two 6 mm cables in the terminals so over 6 mm and you can't physically do it.

It needs RCD protection so if RCD in garage then no, if RCD in house yes.

Should not really supply from a RCBO, MCB, or fuse over 32 amp.

Since you don't give that info can't answer question.
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Postby BLAKEY1963 » Mon Aug 28, 2017 9:18 am

Damouk

As Ericmark says more info required.
what is the size of cables used , and what protective device is employed to protect these cables from the supply indoors ? 32 amp mcb/rcbo , 16 amp ?
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Postby Damouk » Mon Aug 28, 2017 11:44 am

Thanks for coming back to me, the circuit breaker in the house consumer unit is rated at 16amps and the RCD is 32amps. The cable both into and out of the junction box looks like it is 2.5mm. There is a second box with breakers and RCD in the garage, immediately fed from the junction box. That unit has breakers for the light and sockets inside the garage.
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Postby BLAKEY1963 » Mon Aug 28, 2017 1:45 pm

Damouk

Probaly the circuit is signed off as a dedicated circuit with the the garage supply , being designed as just those items to be fed in the garage only.
I would not advise connecting up a socket outlet onto this junction box.
you could seek the advice of a local registered electrician , with no obligation.
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