Gas line bonding

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Kevin Crotty

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Is the gas line in a residence, considered to be bonded through the grounded conductor, of the circuit supplying power to a gas furnace.
 

raider1

Senior Member
Staff member
Location
Logan, Utah
Welcome to the forum.:)

No, not the grounded (neutral) conductor.

The gas piping in a residence is considered to be bonded via the connection to the equipment grounding conductor of the circuit that is supplying the equipment connected to the gas piping.

So basically the EGC from the circuit supplying the gas furnace can be used to ground and bond the gas piping. (See 250.104(B))

Just a heads up though, if you are using CSST (The yellow gas flex) then the manufactures of the gas flex will most likely have specific requirements for bonding the gas flex.

Chris
 

al hildenbrand

Senior Member
Location
Minnesota
Occupation
Electrical Contractor, Electrical Consultant, Electrical Engineer
Is the gas line in a residence, considered to be bonded through the grounded conductor, of the circuit supplying power to a gas furnace.
Also, Welcome to the Forum!

As the previous two responses say: It depends.

What raised the question that you ask?
 

raider1

Senior Member
Staff member
Location
Logan, Utah
You may also want to refer to your local or state adopted Fuel Gas Code (Section 310 of the IFGC)

Good point, the 2009 IFGC has a change for CSST gas pipe bonding.

SECTION 310 (IFGS)
ELECTRICAL BONDING
310.1 Pipe and tubing other than CSST. Each above-ground
portion of a gas piping system other than corrugated stainless
steel tubing (CSST) that is likely to become energized shall be
electrically continuous and bonded to an effective ground-fault
current path. Gas piping other than CSST shall be considered to
be bonded where it is connected to appliances that are connected
to the equipment grounding conductor of the circuit
supplying that appliance.
310.1.1 CSST. Corrugated stainless steel tubing (CSST)
gas piping systems shall be bonded to the electrical service
grounding electrode system at the point where the gas service
enters the building. The bonding jumper shall be not
smaller than 6 AWG copper wire or equivalent.

This change also went into the IRC.

Chris
 
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