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PostPosted: Thu Sep 13, 2018 12:53 pm 
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All.
I need to take some armed cable (SWA) about 15 metres to the bottom of the garden for a double IPP66 socket.
Any thoughts about cable size I should use.
Cheers Tonk


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PostPosted: Thu Sep 13, 2018 2:56 pm 
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It depends what your going to be running off the socket ?

edit. Off the top of my head 2.5 3 core (pvc swa) should be good for 17-18 amps with 4V voltage drop - laid in ground @15m long


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PostPosted: Thu Sep 13, 2018 6:58 pm 
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Bob225 wrote:
It depends what your going to be running off the socket ?

edit. Off the top of my head 2.5 3 core (pvc swa) should be good for 17-18 amps with 4V voltage drop - laid in ground @15m long


I agree with you that it does matter what the OP (or his customers) want to run off the socket.

If it is dedicated high current long term loads then a socket may not be the way forward. If it just a glorified extension lead for the odd item then the socket will be fine.

Of course Tonk has not yet said what protective device he is using for the SWA is or if it RCD protected.

But off the top of my head I'll raise your 15m to 30m with 2.5mm (two core would do) for a 4% volt drop at 18A.


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PostPosted: Thu Sep 13, 2018 11:17 pm 
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Thanks all, a little more clarity as visited customer this evening,
They require a socket (double) for a hot tub. Reading online electrical specifications for their hot tub, it states: the hot tub runs on 13amps and to use a grounded socket with RCD protection.
Couple of questions:
What is a grounded socket?
Assuming the socket does not need to be RCD protected, as every circuit is already RCD protected?
Another question, assuming I can spur of a ring main? Again RCD protected as above.
Lastly, armoured cable now not required as the outside socket will be fixed directly to the outside wall in line with the internal double socket.
Great to receive your feedback. Tonk


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PostPosted: Fri Sep 14, 2018 7:24 pm 
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Grounded means earthed - probably using the word grounded due to translation.

As long as the ring is not highly loaded you can spur directly off the ring.

IMHO hut tubs are mainly used by swingers.


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PostPosted: Fri Sep 14, 2018 10:40 pm 
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Good stuff and thanks once again. Always pleased to read notes so that I can make my judgements
Also enjoy the odd pun
Tonk


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