I thought MK sockets were rated at 13A per outlet?
In any case, what's to stop somebody using a twin socket to supply a kettle and a toaster?
2 gang FCU?
- Thread starter JohnnyG
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I thought MK sockets were rated at 13A per outlet?
In any case, what's to stop somebody using a twin socket to supply a kettle and a toaster?
because you can't spur off a spur.
you can't, for example, spur off a ring to serve a single socket and then spur off that with another single socket. tho i think you used to be able to.
a spur feeding two single sockets as described is not equal to a spur feeding one double socket.
i agree in principal it's the same as a double socket, but it's not allowed as far as i know.
imo if you linked the spurs with 4 or 6 mm it would be ok, but it's not allowed as far as i know.
Due to it's location (airing cupboard) and the existing wiring, extending the ring (which is 2.5mm) isn't really an option and the existing FCU in there is definitely a spur
I thought about making it a switched fused spur then I could easily add 2 new FCUs without issue (correct cabling & load of course) but that would mean 3 boxes in there and the load cable on the existing unit would have to be dug out and extended.
I thought about making it a switched fused spur then I could easily add 2 new FCUs without issue (correct cabling & load of course) but that would mean 3 boxes in there and the load cable on the existing unit would have to be dug out and extended.
Assuming the cable supplying the spurred double socket or two FCU's is able to carry 26A (installation conditions) and has a minimum CSA of 2.5mm (unless it's MICC) then I can't see a problem.
Is there anything in BS7671 (not the appendix) that condones the idea?
I can't see anything.
Obviously total loading of the ring final would have to be considered.
would it be possible to dig out the supply cable and shorten it?
you don't see a double socket with 26A printed on the back.
as regards to designing a ring circuit i see it that
13 A single socket = 13 A double socket = 13 A fused spur unit.
as regards to designing a ring circuit i see it that
13 A single socket = 13 A double socket = 13 A fused spur unit.
MK sockets are rated at 13A per outlet, not 13A total.
The only socket they make that's rated at 13A total is a 3 gang which has an integrated 13A fuse.
Is there anything in BS1363 that relates to total loading of a double socket?
I've not got the standard to hand.
I wouldn't install that way but can you find anything in BS7671 (not appendix) condoning the idea?
I like challenging ideas!
The only socket they make that's rated at 13A total is a 3 gang which has an integrated 13A fuse.
Is there anything in BS1363 that relates to total loading of a double socket?
I've not got the standard to hand.
I wouldn't install that way but can you find anything in BS7671 (not appendix) condoning the idea?
I like challenging ideas!
the only book i have to hand is an old green osg.
it reads
a non-fused spur feeds only one single or one twin socket-outlet or one permanently connected equipment. p 125.
it reads
a non-fused spur feeds only one single or one twin socket-outlet or one permanently connected equipment. p 125.
That's just guidance and simplicity for people who don't understand BS7671 (no direct offence intended).
Have a look at BS7671:2008 when you get chance and see if you can find anything which condones the idea.
I really hope there isn't anything now!
Have a look at BS7671:2008 when you get chance and see if you can find anything which condones the idea.
I really hope there isn't anything now!
i really hope there is! 
Nothing in BS7671 that I know of.
There is mention of it in the OSG, and I think it is in reality what most people would do, but as long as the cable can not be overloaded then all is well.
A spur to a single socket which then supplies another single socket would limit the load to 26A on the spur cable, so would be OK assuming the cable is installed in a way that gives it a CCC of >26A
Personally I wouldn't do it, but it does not contravene any regulation.
There is mention of it in the OSG, and I think it is in reality what most people would do, but as long as the cable can not be overloaded then all is well.
A spur to a single socket which then supplies another single socket would limit the load to 26A on the spur cable, so would be OK assuming the cable is installed in a way that gives it a CCC of >26A
Personally I wouldn't do it, but it does not contravene any regulation.
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If they're feeding heavy stuff, they're best on a radial of their own. Good circuit design should prevent such a heavy load at any one point in an RF circuit.
If the spurs are not feeding powr-hungry equipment, then put a fused spur in limiting the load on the spur to a total of 13A.
If the spurs are not feeding powr-hungry equipment, then put a fused spur in limiting the load on the spur to a total of 13A.
Which is exactly what I was getting at.
BS 1363 requires a double socket to pass temperature rise tests when carrying 20A.
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