Main bonding questions

[ipf]

I'll say the same as I did in #3

Without an actual measurement, we don't know if it's extraneous or not.

I'm just presuming 'earthed metal' to be part of the earthing system. If something needs bonding, it's not.

 

[mainline]

I'm just presuming 'earthed metal' to be part of the earthing system. If something needs bonding, it's not.

I don't really know if they meant earthed as in to the Met or Earthed as in Terra Firma, which is why I asked the question.

 

[ipf]

I don't really know if they meant earthed as in to the Met or Earthed as in Terra Firma, which is why I asked the question.

Yeah, plenty of folk don't know the difference between earthing and bonding, though.

 

[Mikegh]

It's either extraneous or it isn't.
Have you measured it ?

Not extraneous
I'm just trying to understand the shock risk between the pipework that is earthed by the boiler and another piece of exposed metal if it becomes live temporarily

So you've got 1 hand on the pipework and another on say a piece of live exposed metal

 

[mainline]

So you've got 1 hand on the pipework and another on say a piece of live exposed metal

If you have one hand on a live piece of metal and another on a pipe that's earthed via the boiler, then you're going to get one of the worst types of shock you can have, one that's across your chest.