As a requirement of BS7671

taka · Mar 31, 2012

Hi, As a requirement of BS7671, cables used for lighting must have a protctive conductor included within the sheaving.
Could tell me where I can find this regulation in BS7671?
I am sorry for such a basic question.
But I appreciate if somebody can help me.
Best regards,

PC Electrics · Mar 31, 2012

There is no such requirement. BS7671 requires that all accessory points have a cpc run to them but does not prescribe the method by which this must be achieved. You could use twin with no cpc and run a seperate cpc. It'd need to be 4mm though!!! So, if you think about it, from an engineering point of view a cpc in twin sized to be large enough for any device the cable could be connected to is by far the best and most cost effective solution to the requirement.
BS7671 does quote BS6004 though - don't know the ins and outs of that standard, but I'd bet it requires a cpc. I've tried buying single with no cpc but no-one seems to do it, only single plus cpc.

SirKit Breaker · Mar 31, 2012

taka said:
Hi, As a requirement of BS7671, cables used for lighting must have a protctive conductor included within the sheaving.
Could tell me where I can find this regulation in BS7671?
I am sorry for such a basic question.
But I appreciate if somebody can help me.
Best regards,

PC electric has answered your question, so i wont exapand.

But what i will say is, You do not need to apologise for asking a question, nor do you need to say that what you are asking is basic.

There are only 2 types of questions, those you know the answers to, and those that you dont.
There are no basic questions and there are no silly questions.

Please carry on asking, if you dont ask, you dont learn. I have been at this game for over 30 years, and i still ask, because i dont know it all yet.

Sorry for the rant, but it annoys me when people come on here and feel that they are below the others who contribute, you aren't.

Cheers............Howard

taka · Mar 31, 2012

[ElectriciansForums.net] As a requirement of BS7671

Hi PC Electrics. Thank you very much for the quick reply. As you can see this is the question. I answered it correctly but I just wanted to find out it from the BS7671 to get used to it before my exam.

taka · Mar 31, 2012

Thank you very much for your advice!!!!!
Actually it was first time to posting for me.
It is great that somebody can listen to my question and reply.
:wink_smile:

SirKit Breaker · Mar 31, 2012

taka said:
Thank you very much for your advice!!!!!
Actually it was first time to posting for me.
It is great that somebody can listen to my question and reply.
:wink_smile:

It is why we are here:wink5:

Guest111 · Mar 31, 2012

PC Electrics said:
There is no such requirement. BS7671 requires that all accessory points have a cpc run to them but does not prescribe the method by which this must be achieved. You could use twin with no cpc and run a seperate cpc. It'd need to be 4mm though!!! So, if you think about it, from an engineering point of view a cpc in twin sized to be large enough for any device the cable could be connected to is by far the best and most cost effective solution to the requirement.
BS7671 does quote BS6004 though - don't know the ins and outs of that standard, but I'd bet it requires a cpc. I've tried buying single with no cpc but no-one seems to do it, only single plus cpc.

I,ve seen black double insulated singles with no cpc our local council wire all their house lighting in singles,red has cpc and black doesnt can,t remember who makes them though.