Main bonding

[ryan24]

Hi.. I recently purchased a flat and intend doing some re-wiring etc. I have noticed that there is no main bonding going to the gas pipe that enters my flat. The problem is that the cu is located at the opposite end of the flat and the building is concrete floor and ceiling. The gas meter is located outside the ground floor and the gas enters my flat and is about 1 meter long and serves a gas hob only. The meters are bonded outside.What's anyone's take on this because bonding this back to the Met would be a right pain. Thanks in advance

 

[trev]

Within 600 mm of the point of entry on the consumer's side and before any branches. Or where reasonbly praticable.

 

[Richard Burns]

If the gas meter is bonded outside the flat on the consumers side and the pipework to your flat is continuous and unbroken metal up to the hob and the bonding that is done is also connected to the earthing for your supply then you are close to being compliant.

You are not within 600 mm of point of entry and (presumably) the bonding conductor is not continuous as I would expect it to be connected to the incoming building MET and your MET is connected to that.

However if you were to measure the resistance from the gas pipe to your MET I would expect it to be low (in the order of 0.05 ohms) and this resistance would be made up from the copper pipe and the bonding conductors so the csa would be compliant.

Therefore if all the above is the case it should be OK (not perfect but OK and safe).

 

[trev]

That'll teach me to read an OP properly.

 

[dingledong]

Yes it will

 

[Octopus]

Hi.. I recently purchased a flat and intend doing some re-wiring etc. I have noticed that there is no main bonding going to the gas pipe that enters my flat. The problem is that the cu is located at the opposite end of the flat and the building is concrete floor and ceiling. The gas meter is located outside the ground floor and the gas enters my flat and is about 1 meter long and serves a gas hob only. The meters are bonded outside.What's anyone's take on this because bonding this back to the Met would be a right pain. Thanks in advance

More info please!

 

[Richard3009]

The meters bonded outside you say, where does that bonding conductor go to and what size is it

 

[Silly Sausage]

This is near my local boozer, someone is taking the 600mm 'regulation' a smidge too literally! :smilielol5:

 

[peek a boo stoo]

Just read the thread and I'm intrigued myself. Only thing that springs to mind is that it is earthed at a main incoming supply entering the flat, there is usually something like that in these types of buildings.
I would suggest carrying out an R2 test on the pipe work using the MET or CU earth bar should be a suitable point of call then test the service pipes

If you get a suitable reading you have no need to worry about pulling in anything back to the MET

 

[telectrix]

This is near my local boozer, someone is taking the 600mm 'regulation' a smidge too literally! :smilielol5:

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looks like a BG job i saw the other week. it's totally wrong. bonding should be to the gas pipe/s inside the building, within 600mm of the entry point.

 

[Richard Burns]

I saw an industrial unit where the bonding came out at the front of the building, went round the corner, 4m along, past the entry point of the gas to the building, another 12m along the building, round the corner, and 4 m along to where the gas meter was located!

 

[Silly Sausage]

looks like a BG job i saw the other week. it's totally wrong. bonding should be to the gas pipe/s inside the building, within 600mm of the entry point.

Just looked in old Blue 16th (my pics are around that age), 'within 600mm of meter, or entry point for external meter'
Looks my guy just can't understand simple regs!

 

[Geordie Spark]

This is near my local boozer, someone is taking the 600mm 'regulation' a smidge too literally! :smilielol5:

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It could do with a couple more clips on the pipework too.

 

[Knobhead]

Come on Geordie, what’s the point of clipping it properly. It’ll just take the Manchurian’s longer to nick it.

 

[Silly Sausage]

Come on Geordie, what’s the point of clipping it properly. It’ll just take the Manchurian’s longer to nick it.

Oi! It's the Scouse raiders coming down the M62 who are the trouble makers.