What is wrong with bonding plastic water pipes and plastic gas pipes ?

[Rahi99]

I know once you see plastic entering then you don’t need to bond as it says on site guide.(enters the house plastic then it’s metal)

Would I be in wrong if I have earthed the plastic gas pipes ?
Can someone point me in right direction in on site guide if it’s wrong and why it’s wrong ?

 

[davesparks]

How can you earth a plastic pipe? It's an insulator, you can't make an electrical connection to it!

 

[westward10]

I think you need to elaborate because as above you can't earth something that is all insulated.

 

[timhoward]

My best guess is that he's asking if there's any harm been done if he's bonded the internal pipework at a point that is copper even though it enters in plastic.
The simple answer is no, no harm has been done.

 

[ELECNEWT]

My best guess is that he's asking if there's any harm been done if he's bonded the internal pipework at a point that is copper even though it enters in plastic.
The simple answer is no, no harm has been done.

In the event of a fault to earth, the copper pipe would be raised to the same potential.

 

[GBDamo]

I know once you see plastic entering then you don’t need to bond as it says on site guide.(enters the house plastic then it’s metal)

Would I be in wrong if I have earthed the plastic gas pipes ?
Can someone point me in right direction in on site guide if it’s wrong and why it’s wrong ?

You'd be wasting your customers time and money.

You also have to be careful as, if you're recommending this work when it is unnecessary, you may be acting fraudulently.

 

[Rahi99]

My best guess is that he's asking if there's any harm been done if he's bonded the internal pipework at a point that is copper even though it enters in plastic.
The simple answer is no, no harm has been done.

This is exactly what I mean , so there’s no problem with that ?

 

[Rahi99]

In the event of a fault to earth, the copper pipe would be raised to the same potential.

This is what I don’t understand, can you explain this more please

 

[timhoward]

This is what I don’t understand, can you explain this more please

In the event of a fault to earth, the copper pipe would be raised to the same potential.

Agreed. But that rather assumes the copper pipework is completely insulated already. A combi boiler, an immersion heater, a gas hob with electric ignition etc etc will often create a parallel path between the CPC bar and the pipes.
While it shouldn’t be consciously done, IMHO a mistake in this area doesn’t make an installation inherently dangerous. It’s not as if we get called in every time a copper water main is replaced with MPDE.
(Of course one would also hope that ADS /fault protection would clear an earth fault quickly in the first place)

 

[rewireIT]

It's absolutely pointless. Waste of time and money.