Understanding the new regulation regarding Main Bonding.

[HappyHippyDad]

Regulation 411.3.1.2 states ....

Main bonding conductors shall connect to the main earthing terminal extraneous conductive parts.

It then goes on to say...

'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding'.

Lets say we have a water pipe coming into the house in the plastic blue pipe, from then on its metal. The above reg makes me believe this does not need Main bonding, is that correct?

The above reg does not suggest we test the water pipe to see if it extraneous. It just says we have to bond extraneous parts, then it says not to bond if they come in to the house in an insulating section.

If we do test the water pipe it is likely that it will test at 1 or 2 ohms to earth (probably as it is usually connected to earth somewhere within the premises). Does this reg still imply not to bond in this case when we can clearly see an insulating section at point of entry?

 

[snipersmith87]

no. the figure is 22K Ohms. 7.67K is the value of a L-E earth fault or leakage that would trip a 30mA RCD.

A guide to the determination of extraneous-conductive-parts - https://www.voltimum.co.uk/articles/guide-determination-extraneous

 

[snipersmith87]

no. the figure is 22K Ohms. 7.67K is the value of a L-E earth fault or leakage that would trip a 30mA RCD.

A guide to the determination of extraneous-conductive-parts - https://www.voltimum.co.uk/articles/guide-determination-extraneous

 

[Deleted member 9648]

You can't earth plastic end of story. don't be a dick.
Do you earth isolated sections of any sort of pipe.... water/oil etc etc??
My answer is probably not, it's your call.
BUT BUT
I have 2 tests to ask
1 IS IT EXPOSED METAL( OF ANY KIND) THAT HAS THE POTENTIAL TO BECOME ALIVE??????
If yes then the answer must be to earth bond it
2 What would be your defense in the coroners court?

Remember the regs are designed to confuse sparkies by legal numpties.

Exposed metal that is likely to become live under fault conditions will be or should be earthed, that is a requirement for an exposed conductive part. That is nothing whatsoever to do with bonding.