Two cables connected to mcb

Jay89 · Jul 11, 2017

Evening All

Im sure this will have been discussed at some point (if so please point me to a relevant thread)

I have been to look at some remedial work where a previous inspector has flagged up on multiple circuits 'DBx Cx has two cables in mcb, need separating - C2'

These circuits are either lighting or radial power circuits supplying a small amount of sockets. All suitably rated and with decent R1+R2 readings.

I have never seen this to be worthy of a mention let alone a C2 code, i have spoken to my CPS technical and they said they cant see an issue. Just looking for anyone else's opinion

Thanks in advance!

Bobster · Jul 12, 2017

So you're just trolling then?

charlie76 · Jul 12, 2017

westward10 said:
Sounds like there is a lot of lashing on going on.

@westward10, not arguing with your opinion on this but out of interest, someone used the principle above, say you were adding a light to an under stairs cupboard, where the consumer unit was and all cables coming out of the CU were buried and there are no spare ways. How would you do this?

westward10 · Jul 12, 2017

Unless I could enable the supply by alternative means I would suggest the consumer unit has inadequate capacity for the provision of an additional circuit.

davesparks · Jul 12, 2017

westward10 said:
Unless I could enable the supply by alternative means I would suggest the consumer unit has inadequate capacity for the provision of an additional circuit.

But there will almost certainly be capacity to supply the new light from an existing circuit.

Jay89 · Jul 12, 2017

westward10 said:
Unless I could enable the supply by alternative means I would suggest the consumer unit has inadequate capacity for the provision of an additional circuit.

If they wanted an additional socket in the cupboard, how would you feel about taking a spur off a RFC at the consumer unit?

westward10 · Jul 12, 2017

Jay89 said:
If they wanted an additional socket in the cupboard, how would you feel about taking a spur off a RFC at the consumer unit?

Perfectly acceptable or incorporate into the ring final. A lot going on in this cupboard.

davesparks · Jul 12, 2017

westward10 said:
Perfectly acceptable.

How does that differ from doing it with a radial circuit?

charlie76 · Jul 12, 2017

All you are doing is the following. Still one circuit as far as i'm concerned. How is this an issue?

[ElectriciansForums.net] Two cables connected to mcb

streamer · Jul 12, 2017

westward10 said:
Unless I could enable the supply by alternative means I would suggest the consumer unit has inadequate capacity for the provision of an additional circuit.

And the customer would think you were at it!

westward10 · Jul 12, 2017

streamer said:
And the customer would think you were at it!

At what.

streamer · Jul 12, 2017

westward10 said:
At what.

They would think you are trying to invent work by suggesting the only way to put a light in the cupboard would be to change the consumer unit or get to a feed at the nearest switch or light fitting.

westward10 · Jul 12, 2017

I wouldn't suggest changing the CU at all.

streamer · Jul 12, 2017

So if there wasn't a spare way in the consumer unit would you insist on finding a feed elsewhere?

Cadgey123 · Jul 13, 2017

westward10 said:
314-01-04 off the top of my head but I suspect you know this.

Quick enough to jump down someone else's throat when regulations need quoted???

A joint is a joint regardless of at a switch, socket or MCB in consumer unit.

charlie76 · Jul 13, 2017

Well, well, well. Just look at the diagram below from an IEE Wiring Matters article. The diagram is taken from the IET Electricians Guide to the Building Regulations.
I think they have 2 radials in one MCB there or I could be seeing things.
Someone better notify the IET that their diagram does not comply with their regulations...

Right, thats put that one to bed. Now i'm off to bed...

Two cables connected to mcb

Jay89

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Bobster

charlie76

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westward10

davesparks

Jay89

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westward10

davesparks

charlie76

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streamer

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westward10

streamer

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westward10

streamer

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Cadgey123

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charlie76

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