Gas bonding

[Ruairi Hansen]

Hi guys just wondering what peoples thought is on this. I was out looking at a job today and noticed the main gas pipe is not bonded at the meter but has a 10mm earth at the boiler is this a code c2, c3 or nothing?

 

[DPG]

As Davesparks says, the idea of a separate earth rod is a bit worrying. Are you sure they were bring serious?

 

[Ruairi Hansen]

As Davesparks says, the idea of a separate earth rod is a bit worrying. Are you sure they were bring serious?

I was thinking that myself.

 

[7029 dave]

it's 600mm ,or as close as is reasonably practical so it says in regs.
as an aside i had a disagreeement with wet pants who said my gas bond was wrong . he said it should be bonded at meter and not where it enters house, which is a few metres away i said my names on cert so it gets bonded where i say so

Yeah gas safe does say the 600mm or closer, I struggle with this as an Electrician, but hey I have to go with them Its my ticket so will go with it. Errrrrrrrr

 

[Pretty Mouth]

Thing is they teach this at college that it is required to be below or equal to that value, as I have put a number of our apprentices right on the subject.
The worst thing is they can only quote gn3 which is bizarre as gn3 explains what you have said and that it is not from the MET to the bonding conductor.

I too was taught this, and had no idea it wasn't the case until I read this thread. Chris Kitcher also teaches it in his book Guide to Inspection, Testing and Certification, even going as far as to give a table of max lengths for different CSA bonding conductors, so easy to see why we're all getting it wrong:

 

[multimick]

what's the ERR ? fror ,it got bonded where the pipe entered the building. my electrical cert so electrical regs rule.

 

[Ian1981]

I too was taught this, and had no idea it wasn't the case until I read this thread. Chris Kitcher also teaches it in his book Guide to Inspection, Testing and Certification, even going as far as to give a table of max lengths for different CSA bonding conductors, so easy to see why we're all getting it wrong:
View attachment 54609View attachment 54610

Well bs7671 only gives 2 regulations on sizes, either it is sized to table 54.8 or where non pme conditions apply its to be no less than half the size required of the earthing conductor and not less than 6mm and the key point is that if it’s copper it need never exceed 25mm2.
As protective bonding conductors are not sized to carry fault current then it’s stands to reason that their sizes need only be what is set out in the regulations.
It does seem to be an industry thing this 0.05 figure.