Somebody help me please

[cliffed]

Been in this trade for nearly 50 years,with all the tech guides,the regs,videos etc,still can’t get my head around this new reg,concerning main bonding conductors.
If the metal pipes have a plastic insert @ the entry to the building,there is no need to bond.This includes all metal pipe work on that same pipework,internally,is that correct.

 

[Ron Winwood]

Check out the old "15th edition" bonding metalized wall tiles , metal window frames - it was at this point I nearly changed my trade to being a plumber lol

 

[Norah Nabino]

But by bonding these pipes you are connecting them to the electrical system, which means in case of a fault they may have a voltage on them.

The voltage will be the same(uniform throught),equipotential so difference in potential= no electric shock

 

[chrisdungan]

I'm a kiwi who has worked in the UK.
We drive an earth electrode at every installation and bond exposed metal back to that through the switchboard. It's VERY rare for us to come across copper pipes
My thoughts
If it's exposed metal work( including copper pipework) that has the potential now or in the future to become alive or is in close proximity to cables/outlets then earth bond it. We include stainless steel benchtops in that.
The other question we have to ask
" is it electrically UNSAFE?" yes = bond

 

[Midwest]

Bonding something that is not an exposed conductive part nor an extraneous conductive part, is liable to introduce exposure to the fault across larger area than previously was.

If a steel worktop is not extraneous & therefore not bonded, when a person touches a 'live fault' and this unbonded steel workbench, there is no path to earth, and therefore no likelihood of receiving an electrical shock. In the same circumstance, a person touching the fault, and this now bonded steel workbench, they will now receive an electrical shock.

 

[DefyG]

Its not uncommon to come across a pipework system where several plastic push on elbows/connectors, or sections of plastic pipe have been installed throughout the system where previously modified (becoming part copper part plastic)!
It would be an electricians worst nightmare to bond each section on the basis that one particular section may inadvertently become live in the event of a fault.