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Bonding of incoming services

Johno12345

Hello all,

I have carried out a fire risk assessment and noticed that, although there is no gas meter or installation, the metallic gas service entering the building and continuing for approximately 800mm is not bonded, although there is an earth bond coiled up next to it. 

I'm in two minds whether to recommend it be connected, or if this would introduce further potential hazards. 

It can be touched, particularly while turning electricity supplies on and off, but not likely during the general occupation of the building. 

Any thoughts?

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    Gas pipework can be a tricky one - the normal positioning for a bond is after the meter - the logic being the gas supplier can introduce a deliberate insulating joint (IJ) at the meter position to prevent currents flowing through their distribution pipework. Bonding before the meter (or where the meter should be were there one) - although the obvious thing to do from an equipotential point of view defats that. But even normal bonding inevitably leaves some unbonded pipework before the meter position. The switch to plastic distribution pipes has mitigated that risk though.

    Probably the ideal solution is to leave the pipe unbonded but covered so it can't be touched (but not an air-tight enclosure that could trap gas should there a gas escape).

      - Andy.

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  • 0

    Gas pipework can be a tricky one - the normal positioning for a bond is after the meter - the logic being the gas supplier can introduce a deliberate insulating joint (IJ) at the meter position to prevent currents flowing through their distribution pipework. Bonding before the meter (or where the meter should be were there one) - although the obvious thing to do from an equipotential point of view defats that. But even normal bonding inevitably leaves some unbonded pipework before the meter position. The switch to plastic distribution pipes has mitigated that risk though.

    Probably the ideal solution is to leave the pipe unbonded but covered so it can't be touched (but not an air-tight enclosure that could trap gas should there a gas escape).

      - Andy.

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