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Discuss Bunches up lighting circuits in the Electrical Forum area at ElectriciansForums.net

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Good morning all!

Currently carrying out an EICR on a commercial property and have noticed 8 lighting circuits bunched into 2 MCB’s.

0-EE74-FE0-F729-4048-A7-F4-2979-EBDFD688 - https://ibb.co/hCTKpsC

No real danger but not very practical as nuisance tripping could occur and the labelling is a bit vague on the CU.

I’m thinking C3 with recommended CU upgrade.

Any thoughts?

Mike
 
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Charlie_

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Arms
They are just 2 circuits..
A lot of cables to have into 1 mcb though, why not just put them all to 1 proper termination and then take a link from there to the mcb..
What would the nuisance tripping be?
What is the loading of the 2 circuits and their designations?
 

Pete999

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Arms
Esteemed
So apart from your sarcastic reply, you’re classing it as 2 circuits even though they go to different locations?

I personally think it’s very poor practice.
Nothing sarcastic said Mike, just the correct description of the situation.
 

Pete999

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Arms
Esteemed
I read it differently..

I’m just on site and will read the rest later.

Thanks for the useful input
I guess every body is entitled to their own opinion Mike, but I'm puzzled on how you read it differently, and OCPD protects 1 circuit therefore it is 2 circuits rather than 8, example, if someone had taken a 13Amp socket spur from the 32 Amp OCPD, would you class that as 2 circuits?
 
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  • #8
I guess every body is entitled to their own opinion Mike, but I'm puzzled on how you read it differently, and OCPD protects 1 circuit therefore it is 2 circuits rather than 8, example, if someone had taken a 13Amp socket spur from the 32 Amp OCPD, would you class that as 2 circuits?
Do you know how to have a healthy debate? I say what I’m thinking and then you comment on what I’ve said.

You can’t just say not 8 but 2 full stop not alliterating on your answer then not expect me to comment on the vague cocky comment.

That’s why I think it is sarcastic.

I never said the circuits were dangerous I’m just stating that it is poor practice and what coding would you put?

I’m unsure where the cables go as I’m currently here.

Thanks
 
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  • #11
Just another comment,

There is a flat directly above this unit owned by shop) There are recessed luminaries inside a dropped down plasterboard ceiling (lathe and plaster ceiling above) which have no fire hoods and grid lights in a suspended ceiling again with no fire hoods (never seen fire hoods on a grid ceiling light) my thinking is a C3 or does lathe and plaster offer some sort of magical barrier!

Comments?
 

Pete999

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Arms
Esteemed
Do you know how to have a healthy debate? I say what I’m thinking and then you comment on what I’ve said.

You can’t just say not 8 but 2 full stop not alliterating on your answer then not expect me to comment on the vague cocky comment.

That’s why I think it is sarcastic.

I never said the circuits were dangerous I’m just stating that it is poor practice and what coding would you put?

I’m unsure where the cables go as I’m currently here.

Thanks
I thought that was what I was doing Mike, I questioned why you thought that the original response was sarcastic.
Suggested that you had a right to your opinion, and gave a legitimate example of another scenario, for you to comment on, if that's not debating the issue, then I don't what is, quite where you get "cocky comment" from is beyond me, may I suggest you climb down from your high horse, anyway it seems that I have gotten on your wrong side, so I will resign from this debate. In conclusion I would agree a C3 is the correct coding, over and out.
 

davesparks

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Mentor
Arms
Esteemed
Just another comment,

There is a flat directly above this unit owned by shop) There are recessed luminaries inside a dropped down plasterboard ceiling (lathe and plaster ceiling above) which have no fire hoods and grid lights in a suspended ceiling again with no fire hoods (never seen fire hoods on a grid ceiling light) my thinking is a C3 or does lathe and plaster offer some sort of magical barrier!

Comments?
Fire hoods are only required where a fire barrier needs to be maintained. Suspended ceilings with ceiling tiles are rarely, if ever, installed as fire barriers.
For the other ceiling you would also need to confirm whether a fire barrier has been breached or not.

Whilst it is good practice to do it not all holes in a fire rated ceiling would need to be fire sealed either, depending on the number and size of the holes and the type of fire rating.
 

davesparks

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Mentor
Arms
Esteemed
Currently carrying out an EICR on a commercial property and have noticed 8 lighting circuits bunched into 2 MCB’s.
The regulations basically define a circuit as everything which is connected to a single way in a DB. So technically you have only 2 circuits here.
As pointed out previously there are another potential issues with this arrangement.

How many lights are connected to each cable?
 
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