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Question DetailsAsked on 9/21/2016

How much should it cost to ground a gas manifold to a cold water pipe coming from main

There's no direct route to outside or ability to ground below meter (multi level house with finished basement)

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1 Answer


Minimum service charge (typically $75-150 for electrician or plumber) plus about $5-50 materials depending on how long the ground lead wire has to be to reach water pipe.

Generally however, this sort of grounding is old-school and not longer allowed by code - gas manifolds and piping generally has to be grounded to the metal gasline below the meter, or sometimes to separate ground rod (with or without a tagline to the pipe below the meter), depending on utility company and state laws and whether the incoming gasline is plastic or metal. Just because the pipe leading up into the meter is metal does not mean it is a good ground - commonly they use plastic to the meter, then just a stub-up a foot or so with metal pipe to the meter, which is NOT a decent ground.

Ground wire size can also vary from #12 to 2/0 (for residential) that I have seen, and in some areas any part of the wire inside or electrically in contact with the house also has to be exterior use insulated. In some areas has to be stranded, in others can be single wire, etc - so you need to check with your local building department on code requirements in your area - or trust an Electrician to come do it right. (Reason for insulated ground wires in some areas is to reduce change of lightning or static arcing causing a fire).

You say no way to ground below meter (assuming metal gas pipe coming to meter) - you can always run outside with the ground through a hole in the wall and down the wall, tucking it up against the corner trim or such. Can be painted to blend in.

One thing about grounding to water pipe, if allowed in your area - you need to use water pipe clamps specifically intended for grounding use (has ridged on the contact area, not snooth metal which can make contact at only one point), and should NOT be the type that clamps the wire directly against the pipe - should be the type where the clamp goes on the metal pipe (and being sure it is a compatible metal) then the wire is clamped to the connector - like following link - avoids spot corrosion from any current flowing there and possible incompatible metal electrolytic corrosion between the pipe and the wire -

Of course make sure clamp type is designed for the type of metal the pipe is - copper or bronze on copper pipe, galvanized or stainless on metal pipe, stainless on stainless pipe, etc. Should NOT be aluminum - can cause corrosion at pipe and at wire fitting (in most jurisdictions ground wire has to be copper).

Ditto for clamp to gas manifold - compatible metals, and do not compress the wire directly against the pipe - use a clamp with separate wire connection bolt or clamp.

Answered 3 years ago by LCD

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