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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

    I presume the garage would be considered a building in its own right - so the gas meter wouldn't be "outside"?

    Is the gas pipe between the house and garage metal throughout? (I'm not quite picturing the layout - is the duct underground and therefore U shaped? or is something clever happening with pits or differences in levels?) I'm guessing at 1982 it won't be the pliable corrugated metal gas pipes that we see today.

      - Andy.

  • 0 in reply to AJJewsbury

    Thanks for the reply Andy. The duct pipe between the buildings is basically a soil pipe from what I can see. I would think U shaped but can't see it as it is buried. It comes up below the kitchen base units and is out of site. An access hole has been cut in the bottom of the kitchen unit to access it and the bonding connections.   The actual gas pipe between the two buildings is copper.    The incoming gas pipe at the meter is solid probably steel. Not flexible.

    Forgot to say the house is PME.  Not much point TT ing the garage because of the house side bond of this gas pipe. 

    Gary

  • 0 in reply to aligarjon
    aligarjon said:
    The actual gas pipe between the two buildings is copper.

    I was going to suggest a continuity test.

    aligarjon said:
    Forgot to say the house is PME.

    So the main protective bonding conductor should be at least 16 mm² (Table 54.8). (Unless you know that an installation is not PME, probably best to use 16 mm² in any case.)

    One bond as close as possible to entry into the house may be the only practicable option (544.1.2). I think that the garage bond is probably superfluous.

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  • 0 in reply to aligarjon
    aligarjon said:
    The actual gas pipe between the two buildings is copper.

    I was going to suggest a continuity test.

    aligarjon said:
    Forgot to say the house is PME.

    So the main protective bonding conductor should be at least 16 mm² (Table 54.8). (Unless you know that an installation is not PME, probably best to use 16 mm² in any case.)

    One bond as close as possible to entry into the house may be the only practicable option (544.1.2). I think that the garage bond is probably superfluous.

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