Plumbers. Bless them.

[EFLImpudence]

It is my understanding that multicore cables/flexes, may have their green and yellow conductors sleeved (although I feel it should be avoided wherever possible).

No. For what reason?
They must be present and used as a cpc. therefore the need cannot arise.

Single green and yellow cables (those used in trunking and conduits etc.), should never be over sleeved.

Correct, but in singles it would be 'possible' to wire a circuit using nothing but green&yellow.

Twin and earth cables should equally never have the CPC sleeved with any colour other than green and yellow.

Correct.

 

[JohnW2]

It is my understanding that multicore cables/flexes, may have their green and yellow conductors sleeved (although I feel it should be avoided wherever possible).

That does,appear to be the situation.

Single green and yellow cables (those used in trunking and conduits etc.), should never be over sleeved. ... Twin and earth cables should equally never have the CPC sleeved with any colour other than green and yellow.

All that, too - although obviously not directly relevant to the matter being discussed.

However, as we keep explaining, none of that allows you to have a cable without a CPC - and the implication of your wanting to oversleeve a G/Y core is that you have not got enough cores to have a CPC. Hence, whilst over-sleeving of the G/Y core of flex may be technically allowed, in practice it is never going to be possible to do it without creating a situation which is non-compliant with BS7671 - so the oversleeving business is actually a bit of a red herring.

Kind Regards, John

 

[doitall]

RS electrical still sell 2 core control cables. and probably lots more if I asked.

 

[JohnW2]

RS electrical still sell 2 core control cables. and probably lots more if I asked.

They undoubtedly also sell bare wire, but that doesn't mean that it is necessarily acceptable to use it for any purpose which takes ones fancy. I really don't think that what RS sells can be taken as an indication of what regulations require.

As far as I am aware, the only situations in which 2-core cable is acceptable are (a) in the leads between plugs and Class II appliances (which are not part of 'fixed wiring') and (b) (by specific exception in BS7671), with pendant lighting, the cable joining a ceiling rose to a lampholder which has no exposed metallic parts.

Kind Regards, John

 

[EFLImpudence]

RS electrical still sell 2 core control cables.

Smith and wesson still sell guns.
Whether it is allowed depends on how you use it.

 

[doitall]

RS electrical still sell 2 core control cables.

Smith and wesson still sell guns.
Whether it is allowed depends on how you use it.

Precisely, it depends how you use it.

Can't see RS or any other wholesaler selling 6amp or any other amp cable if there's no sell for it.

The other miner point is you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

http://uk.rs-online.com/mobile/c/cables-wires/electrical-power-industrial-cable/mains-power-cable/
I honestly can't see any further discussion is needed, so I'll take my leave until further notice.

 

[JohnW2]

The other miner point is you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

I've told you the only exceptions which, to the best of my knowledge, exist as far as BS7671 is concerned - and they don't include heating controls.

Only you know whether or not you want/need the work you do to be BS7671-compliant.

Kind Regards, John

 

[EFLImpudence]

Precisely, it depends how you use it.

Yes, not wrongly - as your colleague admitted.

The other miner point is you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

Apart from pendant drops I am trying to think of one.
Definitely not domestic fixed wiring where 240V is present.

However, there are many applications for cable - space shuttles?
The 2 core in question is under 'control cable' but is 16A so maybe not for boilers.

I honestly can't see any further discussion is needed

That would appear to be the case.

 

[doitall]

Of course if there's any other Authorities you'd like me to ask please let me know and consider it done.

 

[securespark]

you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

Don't take this as an attack: I've looked through the thread and can't see where heating control wiring has been mentioned as being exempted from the need for a cpc.

 

[ban-all-sheds]

Of course if there's any other Authorities you'd like me to ask please let me know and consider it done.

Yes please - Xenu.

I trust you won't come back without an answer from him?

 

[Monkeh]

you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

Don't take this as an attack: I've looked through the thread and can't see where heating control wiring has been mentioned as being exempted from the need for a cpc.

Supposedly he was told it's exempt from that among other things such as good workmanship (read: common sense) by someone at NICEIC.

 

[doitall]

you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

Don't take this as an attack: I've looked through the thread and can't see where heating control wiring has been mentioned as being exempted from the need for a cpc.

It's irrelevant really Sp.

The registration bodies say it's ok to oversleeve a green and yellow, my building inspector also say it's ok, looks like everyone that matters say it's ok.

They all say which I agree is it should be avoided where possible, but it is not outside of the regs.

 

[Monkeh]

you have been saying a cpc most be present no exceptions, now you saying there is exceptions, maybe heating controls.

Don't take this as an attack: I've looked through the thread and can't see where heating control wiring has been mentioned as being exempted from the need for a cpc.

It's irrelevant really Sp.

The registration bodies say it's ok to oversleeve a green and yellow, my building inspector say it's ok.

They all say which I agree is it should be avoided where possible, but it is not outside of the regs.

Is there not one about good workmanship?

 

[ban-all-sheds]

All plumbers are exempt from that.