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Discuss IEE 18th, 701.415.2 p241 - sup bonding bathroom in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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Hi

Old time 15th Ed. working way through 18th in prep for 18th test, also been a while since i wired in anger so to speak :).

701.415.2 states that i can omit supplementary bonding in my bathroom so long as i have a protective equipotential bond compliant to 411.3.1.2 and finals in the location and running through are protected by RCD and all finals in location are compliant with 411.3.2 and that all extraneous conductive parts in the area are 'effectively' connected to protective equipotential bonding according to reg 411.3.1.2 and that effectiveness is assessed based on the 415.2.2 calc.

It is a TN-C-S supply, I have RCBOs throughout, and old bond on my cold water coming in on my side of the water, even though it is plastic pipe into the building. There are older cross bonds in the airing cupboard, main bond on my gas (again plastic coming in) and even another bond at my boiler.

I know i have plastic pipes feeding my large centrally heated towel rail in the bathroom as they were recently changed. When i measured the resistance between the rad and that of a local CPC, it was about 140KOhm, well above 1,666 Ohms as per the calc.

Questions:

Is my non-electrically connected (it has no separate 230Vac heating element) towel rail radiator classed as an extraneous conductive part?

If it is, then does this mean that technically i should provide a bond between it and the CPC of the local LV circuits?

If answers are Yes and Yes, why please?

Thanks

John
 

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