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PostPosted: Tue Aug 14, 2018 4:54 pm 
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Hi all,

I've recently had an automated garage door opener installed. It has a plug but this doesn't reach the double socket on the wall.

Can I simply spur off the existing double socket to have this on permanently whilst still leaving my double socket available for use?

The existing socket is wired back to the main house consumer unit with RCB protection, i believe?


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PostPosted: Tue Aug 14, 2018 5:48 pm 
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I'm no expert but that sounds like it'd work.

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PostPosted: Tue Aug 14, 2018 5:59 pm 
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Just check that the existing double socket itself is not a spur. You can't spur off a spur (unless it's fused).

How many cables are going into your existing socket? If it is two, it *usually* means it's part of the ring main and not a spur.

If it is one cable, it means it's either a spur (most likely) or part of a radial circuit (instead of a ring main). If it has one cable, best to get an electrician to check.

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PostPosted: Thu Aug 16, 2018 1:23 am 
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Basic idea is 2.5mm sq cable is good for around 20A so feeding a double socket it is unlikely to exceed 20A, but two double sockets could, so if the supply fuse/MCB/RBCO is 20A or less you can add extras without a problem, but if over 20A then you can't rely on the fuse in the plug, it needs some other protection i.e. 13A fuse.

LAP do a grid switch system where you can combine in a double socket box a socket, fuse and switch, that is the easy way to extend.


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PostPosted: Thu Aug 16, 2018 12:41 pm 
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ericmark wrote:
LAP do a grid switch system where you can combine in a double socket box a socket, fuse and switch, that is the easy way to extend.

Where would you suggest the op installed this in his case?


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PostPosted: Thu Aug 16, 2018 3:20 pm 
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sammy.se wrote:
Just check that the existing double socket itself is not a spur. You can't spur off a spur (unless it's fused).

How many cables are going into your existing socket? If it is two, it *usually* means it's part of the ring main and not a spur.

If it is one cable, it means it's either a spur (most likely) or part of a radial circuit (instead of a ring main). If it has one cable, best to get an electrician to check.

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I would suggest that calling an electrician out is a little extreme in this case.


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PostPosted: Thu Aug 16, 2018 4:33 pm 
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Just run a 2.5mm cable from your socket to a switched fused spur then on to a new socket.

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PostPosted: Thu Aug 16, 2018 5:04 pm 
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wine~o wrote:
Just run a 2.5mm cable from your socket to a switched fused spur then on to a new socket.


The switched fused spur is overkill.


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PostPosted: Thu Aug 16, 2018 5:13 pm 
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mick.mh2racing wrote:
I'm no expert but that sounds like it'd work.


It will. And it will work fine with no other problems.

:salute: for stating the obvious.


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PostPosted: Thu Aug 16, 2018 5:50 pm 
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OnlyMe wrote:
wine~o wrote:
Just run a 2.5mm cable from your socket to a switched fused spur then on to a new socket.


The switched fused spur is overkill.


Can I ask why ?

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PostPosted: Fri Aug 17, 2018 8:27 am 
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wine~o wrote:
OnlyMe wrote:
wine~o wrote:
Just run a 2.5mm cable from your socket to a switched fused spur then on to a new socket.


The switched fused spur is overkill.


Can I ask why ?

Assuming that the op is spurring off the double socket to power a single socket then the plug fuse provides the required overload protection just aswell as the fuse in a FCU.


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PostPosted: Fri Aug 17, 2018 5:29 pm 
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OnlyMe wrote:
Assuming that the op is spurring off the double socket to power a single socket then the plug fuse provides the required overload protection just aswell as the fuse in a FCU.


Which is fine until some-one else (no not him) comes along later and sticks a double socket in...

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PostPosted: Fri Aug 17, 2018 7:06 pm 
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wine~o wrote:
Which is fine until some-one else (no not him) comes along later and sticks a double socket in...


:lol:

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PostPosted: Sat Aug 18, 2018 9:37 am 
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wine~o wrote:
OnlyMe wrote:
Assuming that the op is spurring off the double socket to power a single socket then the plug fuse provides the required overload protection just aswell as the fuse in a FCU.


Which is fine until some-one else (no not him) comes along later and sticks a double socket in...


And? You can still run 20A indefinitely from it.


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PostPosted: Mon Aug 20, 2018 10:21 pm 
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DIYnot23 wrote:
Hi all,

I've recently had an automated garage door opener installed. It has a plug but this doesn't reach the double socket on the wall.

Can I simply spur off the existing double socket to have this on permanently whilst still leaving my double socket available for use?

The existing socket is wired back to the main house consumer unit with RCB protection, i believe?
If it's part of the ring circuit you can spur off this to another socket.

If it's a spur off another socket on the ring circuit then you can trace the cable back to the socket it has been spurred off, replace with a longer cable and then install a new socket near your garage door opener. Or as mentioned by others come off the spur (if indeed the socket in question is a spur) install a fused connection unit then wire a socket up to that.

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