Cable tie a C.P.C to a exturnous pipe work

C.P.C? Explain please. You can not cable tie any electrical wiring to any gas pipe! Water is usually ok provided you allow for any condensation. So long as the voltage will not exceed 50V DC 200V AC. The water pipe must be earthed if copper or iron and if it is plastic BLUE alkathene it should only depend on it not getting hot.

See IEE regs 17^th Edition. For UK regulations.

C.P.C = circuit protective conductor

Plus a C.P.C isn't a current carrying conductor, (only under a fault condition) 17th edition isn't out till January 2008 that's if it is approved then it will be in practice in June 2008 in the uk. So at the moment it's 16th edition to 3rd admendment. And where does it say you can't do this please??????

So long as your conductor is at NO POTENTIAL all is well but under a fault condition it could be a hazard. The gas regulations specify no electrical wiring can be attached to a gas pipe unless it is a protective earth bonding. See Electrical Installations in Hazardous areas. by Alan Mc Millan Heinman from Farnell Order code 725-0447 £77.11

Silly really when it's a C.P.C they would be greatful that it's cable tied to there gas pipe. Because any break down in the cable with insulation etc will be touching the gas pipe and earthing it anyway. I't like wiring door magnets in twin and earth it doesn't matter because when the fire burns through the cable it's gona demagnetise the magnets and yet peoples say you should wire them in F.P 200?????

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wheres the logic i'm not feeling the love!

The NEC equivalent of the C.P.C. is the "Grounding Conductor". Its purpose is similar, but the details are different. It's always a good idea to follow the locally applicable codes. Or exceed them, if safety is an issue. Since the C.P.C. is a non-current-carrying conductor, and required to be insulated, there should be no problem.

Regs, or no... i wouldn't... most regs try to cover the remote possibillities. Consider that in future you may want to upgrade maintain one or the other.. & if tied together.. much extra work. best to leave -0- room for doubt. I would be concerned about effects of a lightning strike or accidental energising from a hi voltage, outside bldg. source .. Very unlikely, unless it happens to you..then its 100%

also.. _any_ risk of added moisture near _any_ conductor, passive or no... should be avoided where possible. I am a utilities Tech i see shortcuts all the time..the idea worked without a hitch until.., 5 yrs later they call me in to fix it...

J Bo

You can not cable tie a cpc to extraneous pipe work, only exposed conductive parts require a cpc. Pipework that is extraneous must have main equipotential bonding ( reg no 413-02-02) and depending on the installation type ( ie TN-S,TN-C-S etc..) it is usually 10mm2 earth cable connected via clamps which comply to BS951 ( reg no 542-03-03 ). There's no reg stating you can't cable tie a cpc to extraneous pipework because it's not the common practice. Hope this helps.

In the UK the Gas regulations stipulate that there must be at least 25mm space between any electric cable or earthed metalwork of an electrical installation installation and a gas pipe, with no electrical connection to the suppliers pipework at all

The Water Bylaw regulations have a similar statement.

In the electrical installations, the NICEIC cites the regulation that states that cables must be properly supported to "fail" such installations - I don't have my regs book to hand so I cannot quite the Reg now, but I will look it up, I can also give you the gas Reg. Check this thread

The Water Reg is more difficult as it depends on where you are and I work under the Scottish Bylaw regulations which differ substantially from the English versions.

It would be better to attach it to the cable containing the circuit line conductors!

Better still, the <...C.P.C....> ought to be in the same cable as the line conductors, begging the question why is that cable short of a conductor to carry out the function of the <...C.P.C....>?