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

    It's not outside, it's in the garage ... a building. BS 7671 requires main protective equipotential bonding to be provided for each building. (Regulation 411.3.1.2 'Where an installation serves more than one building the above requirement shall be applied to each building')

    So, yes, bonding in the garage needed separately back to the house.

    In terms of cross-sectional area of the bonding conductors (and whether the circuit protective conductor between the garage and house needs to be suitably sized), we really need to know the earthing arrangements. If it's PME, then yes the minimum cross-sectional area should be maintained back to the house. If it's "guaranteed TN-S" or TT, the conductor in the garage can be sized according to the supply to the garage, and the cpc to the garage doesn't need to meet minimum requirements, although for TN-S the DNO might have a minimum requirement to be achieved.

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

    It's not outside, it's in the garage ... a building. BS 7671 requires main protective equipotential bonding to be provided for each building. (Regulation 411.3.1.2 'Where an installation serves more than one building the above requirement shall be applied to each building')

    So, yes, bonding in the garage needed separately back to the house.

    In terms of cross-sectional area of the bonding conductors (and whether the circuit protective conductor between the garage and house needs to be suitably sized), we really need to know the earthing arrangements. If it's PME, then yes the minimum cross-sectional area should be maintained back to the house. If it's "guaranteed TN-S" or TT, the conductor in the garage can be sized according to the supply to the garage, and the cpc to the garage doesn't need to meet minimum requirements, although for TN-S the DNO might have a minimum requirement to be achieved.

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