2.5mm used for lighting circuit.....

[dandb]

Hello chaps

Did a visual safety check at a house today. All seems ok, except for the lighting circuit. Who ever installed/re-wired the system has used 2.5mm cable.....to me it seems a bit overkill, but could this be used to try and cover an issue that its previously had.

Is this ok?

Not tested any circuits as a visual check only, but i have never seen it before

Thanks in advance

 

[KINKY]

Only thing I can think of is, if it is a long run, they may not have achieved the ELI on 1.5mm2 so they opted for 2.5mm2, or volt drop issues, both of which, increasing cable size would have eliminated.

 

[dandb]

Only thing I can think of is, if it is a long run, they may not have achieved the ELI on 1.5mm2 so they opted for 2.5mm2, or volt drop issues, both of which, increasing cable size would have eliminated.

Its only on upstairs lighting, 2 berooms and a bathroom. My thought exactly were for vd but it must only be 20/30m of cable max....maybe then ran out of 1.5 lol...still red/black cable colours

 

[Hawk81]

if all the readings are good and connections are good there is nothing to worry about. maybe whoever done it had no 1.5mm left and was in a hurry to finish.

 

[J@mes]

It would need to be about 40M long to produce a volt drop which required 2.5mm to cover it! As said, maybe used to gain acceptable ELI readings, or was it just all that they had?

I would note it, as it may confuse others who are looking at circuits within the house (ie they may want to spur off the ring but end up with the lighting instead) but not sure if it is a code worthy issue or not?

 

[jpmiff]

Hi

what size mcb is on the cable,

 

[ian.settle1]

Nothing wrong with using 2.5mm for the lights, bit overkill though.

Remember when I was serving my time over 30 years ago one off the lads at college said he worked with a bloke who did lights in 2.5mm and ring mains in 4mm

 

[sythai]

Bit dodgy when you find what I did on PIR last week..... took cover off socket and 1 x 2.5 in there and also 1 x 1.5 3core.... traced it under floor below and looks like they'd run out of 2.5 and just stuck a bit of 1.5 3 core to extend it for the last metre nicely joined in a connector block - quality install!!

 

[beaver74]

quality install!!

thanks

 

[KINKY]

Nothing wrong with using 2.5mm for the lights, bit overkill though.

Remember when I was serving my time over 30 years ago one off the lads at college said he worked with a bloke who did lights in 2.5mm and ring mains in 4mm

o dear!

 

[robsparky1975]

ZS for a 6amp cb is 7.67 ohms so not for that reason i dont think,with regard to mr diy faffing about under the floor,he should call one of us,and we would check and find what you have.

 

[dixon9]

Bit dodgy when you find what I did on PIR last week..... took cover off socket and 1 x 2.5 in there and also 1 x 1.5 3core.... traced it under floor below and looks like they'd run out of 2.5 and just stuck a bit of 1.5 3 core to extend it for the last metre nicely joined in a connector block - quality install!!

Was it not for a spur then? Or you mean it was linking the ring?

 

[Doomed]

I recently did a lighting circuit in 2.5 as it was an evening job and I had left my 1.5 at home (2 hours away). Either waste time and petrol or use 2.5 instead.

 

[blackiel]

Nothing wrong with using 2.5mm for the lights, bit overkill though.

Remember when I was serving my time over 30 years ago one off the lads at college said he worked with a bloke who did lights in 2.5mm and ring mains in 4mm

o dear!

Nothing wrong with it,as long as its fused and terminated correctly...ever tried wiring a 2.5 into a ceiling rose,with other 2.5 s..******* job...

 

[KINKY]

Nothing wrong with using 2.5mm for the lights, bit overkill though.

Remember when I was serving my time over 30 years ago one off the lads at college said he worked with a bloke who did lights in 2.5mm and ring mains in 4mm



Nothing wrong with it,as long as its fused and terminated correctly...ever tried wiring a 2.5 into a ceiling rose,with other 2.5 s..******* job...

I meant o dear as in waste of money and creating hassle for himself terminating.