To spur or not to spur?.....

Pete999 · Jun 7, 2018

littlespark said:
Um... I've done the job now. I put the existing spur on the feed side of the SFCU, and the new spur, in 1.5 to a double socket from the load side. Right or wrong, its done now and I cant see the difference from this, or a spur off the back of a single socket and running an extension lead from it.

You have fed the new spur from an existing spur directly no FCU and fed the twin socket from the load side of the FCU Right so far?so that will be 2 unfused spurs and the twin socket fused from the new FCU? I'm confused now, can you do a sketch of wht's been done?

Pete999 · Jun 7, 2018

littlespark said:
Um... I've done the job now. I put the existing spur on the feed side of the SFCU, and the new spur, in 1.5 to a double socket from the load side. Right or wrong, its done now and I cant see the difference from this, or a spur off the back of a single socket and running an extension lead from it.

You have fed the new spur from an existing spur directly no FCU and fed the twin socket from the load side of the FCU Right so far?so that will be 2 unfused spurs and the twin socket fused from the new FCU? I'm confused now, can you do a sketch of wht's been done?

littlespark said:
Um... I've done the job now. I put the existing spur on the feed side of the SFCU, and the new spur, in 1.5 to a double socket from the load side. Right or wrong, its done now and I cant see the difference from this, or a spur off the back of a single socket and running an extension lead from it.

An extension lead is not fixed wiring.

Pete999 · Jun 7, 2018

Pete999 said:
You have fed the new spur from an existing spur directly no FCU and fed the twin socket from the load side of the FCU Right so far?so that will be 2 unfused spurs and the twin socket fused from the new FCU? I'm confused now, can you do a sketch of wht's been done?

An extension lead is not fixed wiring.

Have you bothered to look at Appendix 15 of BS7671?

DPG · Jun 7, 2018

I think the confusion stems from him using the term 'spur' to mean FCU. Apologies to the OP if I'm wrong.

Pete999 · Jun 7, 2018

y

DPG said:
I think the confusion stems from him using the term 'spur' to mean FCU. Apologies to the OP if I'm wrong.

The reason I asked the question and I to appologise if I have it wrong, but it sounds has though the OP has fed an FCU from an existing spur on the RFC, that to my mind is 2 spurs, what say you ?

DPG · Jun 7, 2018

Not sure Pete. You could be right though.

littlespark · Jun 7, 2018

Ok. lets look at the existing installation. At one time there was a single socket, on the RFC. Some time later, a double socket was installed along the wall a bit. This could have been a valid spur off the RFC, yes?
At the same time, or at a later time, the single socket was taken off and a blank plate was put in its place, the joint which made up the spur was then made from 30A connector behind the plate.

Here I come along and connect a SFCU to the conductors. At the moment it is no different to the spur off the back of the previous single socket.
I then run another cable from the LOAD side of the SFCU to 1 x double socket. This double socket, which is solely for TV equipment, is switched and fused.

The original RFC is in 2.5 singles. Original spur in 2.5 T&E. My new cable is 1.5mm T&E

I do not see this as a spur-from-a-spur

Pete999 · Jun 7, 2018

littlespark said:
Ok. lets look at the existing installation. At one time there was a single socket, on the RFC. Some time later, a double socket was installed along the wall a bit. This could have been a valid spur off the RFC, yes?
At the same time, or at a later time, the single socket was taken off and a blank plate was put in its place, the joint which made up the spur was then made from 30A connector behind the plate.

Here I come along and connect a SFCU to the conductors. At the moment it is no different to the spur off the back of the previous single socket.
I then run another cable from the LOAD side of the SFCU to 1 x double socket. This double socket, which is solely for TV equipment, is switched and fused.

The original RFC is in 2.5 singles. Original spur in 2.5 T&E. My new cable is 1.5mm T&E

I do not see this as a spur-from-a-spur

Your original post seemed to imply, that you spurred from the original spur, ie original spur on RFC, along you come and take another feed from that original spur, to the feed side of the FCU and from there on do whatever because you have it fused at the FCU.
I'll try and elaborate, have you taken the suPply to the FCU from a spur or directly from the RFC?

littlespark · Jun 7, 2018

Its directly off the RFC. Supply side of SFCU has 3 sets of conductors. Load side has 1.

Sorry for the confusion. English was never my strongest subject. - That's why I became an electrician.

Toneyz · Jun 7, 2018

littlespark said:
Its directly off the RFC. Supply side of SFCU has 3 sets of conductors. Load side has 1.

Sorry for the confusion. English was never my strongest subject. - That's why I became an electrician.

I get what you have done unswitched fused spur from supply/feed terminals
1.5 fused spur from load terminals.

Pete999 · Jun 7, 2018

littlespark said:
Its directly off the RFC. Supply side of SFCU has 3 sets of conductors. Load side has 1.

Sorry for the confusion. English was never my strongest subject. - That's why I became an electrician.

I'm confused so deleted my reply, sorry

Adam W · Jun 7, 2018

buzzlightyear said:
what came first the chicken or the egg.

The egg.
what we consider to be the present incarnation of the chicken most likely evolved, perhaps from some kind of dinosaur.

AJshep · Jun 7, 2018

I get you littlespark.
Your method is OK as you only have 1 spur from the ring the other is fused.
But I bet it's a bit tight cramming 4 cables in the back if a spur though!

Richard Burns · Jun 7, 2018

It sounds fine to me.
You have an unfused spur off the ring to a double socket.
You have (at the same point) got a fused spur feeding a double socket.
So like the diagram below.

[ElectriciansForums.net] To spur or not to spur?.....

top one unfused, bottom one fused through the new SFCU

DPG · Jun 7, 2018

Can't beat one of Richard's diagrams!

To spur or not to spur?.....

Pete999

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Pete999

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Pete999

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DPG

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Pete999

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DPG

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littlespark

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Pete999

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littlespark

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Toneyz

Pete999

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Adam W

AJshep

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Richard Burns

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DPG

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