2 circuits

[brightspark2010]

High today at a fault call i noticed that on a row of lights that were out the swa that fed them was also feeding the other row so two seperate circuits fed via 2 seperate mcbs eg lives, neutrals+ cpcs all in the same multicore armoured i informed the client this would need rewiring with a new feed for the other row. However was just looking to see if anyone knew what regulation would back up my claim? Cheers

 

[trev]

2 rows of lights with one feed? Whats the problem? it's not 2 different circuits it's 2 sets of lights on one circuit

 

[trev]

I Got to learn to read posts properly

 

[Deleted member 9648]

Is it any different to a conduit or trunking that has two circuits within?.....

 

[brightspark2010]

Thats what i was askinng is it acceptable for two circuits in 1 multicore cable then never heard of at college or seen in the last decade on site and to trevor this was definately two circuits not two rows on 1 feed

 

[trev]

2 rows of lights with 2 seperate feeds = 2 circuits. It matters not that they are fed from the same multicore, 1 live to each row 1 neutral to each row 1 cpc to each row. As wirepuller said whats the difference between that and a bit of trunking with 2 circuits in it?
I've read the op properly now hehe

 

[brightspark2010]

Oh cheers mate i was a bit worried when i saw it i know in pricipal its the same as numerous circuits in a trunking/conduit system just never seen two circuits down one cable and was a bit worried if it was ok just in case someone isolated 1 circuit and thought they had killed the entire cable.

 

[Engineer54]

A couple of questions, .....

How many cores to this SWA cable??
Are the two circuits sharing a single neutral conductor??

 

[brightspark2010]

Six cores in this cable l,n+cpc for both circuits no shared neutral that would defo be incorrect

 

[Engineer54]

Certainly not the most conventional way of supplying two lighting circuits!!!

 

[Knobhead]

Unconventional maybe, but nothing wrong with it. Unfortunately for our OP he’s got to say sorry I’m wrong to his customer.
View attachment 9130
Your on your own kid.

 

[Rockingit]

"I've been having a bit of a think about that cable and I think we'll be OK because.........."

If you think about it, we use multicore cables for multiple circuits all the time - what else is YY? My background in theatre lighting is almost totally reliant on a long established practice of running six separate lighting or power circuits (L,N,E) down 1 x 18 core 1.5mm cable (Socapex).