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Gas bond in detached garage ?

aligarjon

Hi Guys.

I carried out an EICR earlier and am a little unsure of the bonding setup.  House built in 1982. Original wiring which is ok. 16mm tails/6mm earth. 6mm bonding conductors. 60 amp main fuse.

The gas meter is in the detached garage. About 2 meters from house. There is a 6mm gas bond in there at the gas meter that is clearly under sized as it has been taken from the 2.5mm supply cable for the garage power.

The gas pipe from the meter goes through a 4inch duct and pops up in the kitchen below the units next to the water pipe. Both are bonded there in 6mm. This area backs onto the garage so in reality 2 or 3 meters away if that is relevant. 

My question is is the bond by the gas meter actually required as it is outside anyway or will it potentially need upgrading.

My gut reaction is it is fine as it is. There is no water in the garage.

The supply pipe to the gas meter drops into the concrete floor and as far as I can chip the floor away looks steel, although I am only seeing threading nut connections before it is buried so may well be plastic.

Any guidance would be appreciated

Thanks.  Gary

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  • 0 in reply to aligarjon

    No, it is not IMHO.

    Isn't the reason for bonding as close as possible to the meter that it reduces the possibility of leaving a bond on a section of gas pipe which has subsequently been disconnected?

  • 0 in reply to Chris Pearson
    Chris Pearson said:

    No, it is not IMHO.

    Isn't the reason for bonding as close as possible to the meter that it reduces the possibility of leaving a bond on a section of gas pipe which has subsequently been disconnected?

    The bonding in both buildings is necessary to conform to BS 7671. If it's PME, I agree that the cross-sectional area to the bond close to the meter is important, but that doesn't mean the gas pipes in the installation after the meter can't be further bonded. Especially in this case, the pipe goes underground, but still bonding needs to be applied "in each building" (Regulation 411.3.1.2).

  • 0 in reply to gkenyon
    gkenyon said:
    The bonding in both buildings is necessary to conform to BS 7671.

    I stand corrected (again Anguished ).

    mapj1 said:
    My point is that  the gas pipe is the better conductor linking the two locations, by far.

    That was my thinking.

    aligarjon said:
    Upgrading the bonding is pretty much impossible without massive disruption and taking part of the kitchen out.

    Can the bonding not take another route? With the garage electrical supply?

    TT the garage?

    Of course, if the two buildings were joined so that they became one, the electrical problem would vanish.

    (I have no idea whether it is permissible to use a bit of ordinary copper pipe underground to supply gas.)

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