Bonding gas pipe in residence

[powerqualitycc]

Is it required to bond the gas pipe in a single building residence?


Article 250.52 (7)
(B)Electrodes Not Permitted for Grounding
(1) Metal underground gas piping system.


Article 250.104
(B) Other Metal Piping
Where installed in or attached to a building or structure, metal piping systems, including gas piping, that is likely to become energized shall be bonded to the service equipment enclosure...

[ January 17, 2006, 12:07 PM: Message edited by: powerqualitycc ]

 

[bphgravity]

Re: Bonding gas pipe in residence

The key words are "likely to be energized". This is open to interpretation. Consult your AHJ.

 

[beanland]

Re: Bonding gas pipe in residence

I read this as not confusing: A gas pipe cannot be used as a source of grounding (it is insulated and has insulated couplings) but it is to be bonded to reduce possible sparking.

 

[mark480]

Re: Bonding gas pipe in residence

I agree with Bryan, In our state (NJ) it seams that the inspectors do not inforce this 250.104(B)GAS PIPING unless they feel it is a unsafe application.It is again up to the AHJD

 

[pierre]

Re: Bonding gas pipe in residence

Lets not forget that the EGC of the circuit that supplies the power to the gas equipment is permitted as the bonding conductor. - the last sentence of .104(B)

 

[rick hart]

Re: Bonding gas pipe in residence

Article 250.52 (7)
(B)Electrodes Not Permitted for Grounding
(1) Metal underground gas piping system.

This covers what is an acceptable grounding electrode for a system. You cannot use an underground gas pipe for an electrode for any electrical system.

Article 250.104
(B) Other Metal Piping
Where installed in or attached to a building or structure, metal piping systems, including gas piping, that is likely to become energized shall be bonded to the service equipment enclosure...

This section covers what must be bonded within a system to an approved grounding electrode. The gas pipe must be bonded because it can become energized which will create a shock hazard.

 

[charlie]

Re: Bonding gas pipe in residence

Rick, please take a look at what Bryan and Pierre said. You last statement is already addressed.

 

[tom baker]

Re: Bonding gas pipe in residence

Keep in mind the difference between grounding and bonding of the metal gas pipe.
We can't use a gas pipe as a grounding electrode, gas meters have a di-electric union at the meter, and new gas piping is non-metallic.
But inside the bulding the gas piping must be bonded. If there is an EGC for the equipment that could energize the piping, the NEC says that will clear the fault. The 2002 had different and confusing language in 250.104.

 

[infinity]

Re: Bonding gas pipe in residence

Originally posted by mark480:
I agree with Bryan, In our state (NJ) it seams that the inspectors do not inforce this 250.104(B)GAS PIPING unless they feel it is a unsafe application.It is again up to the AHJD

It is not that 250.104(B) isn't enforced, it's the interpretation by the state (NJ), that additional bonding of the gas pipe is not required since the pipe is bonded by the EGC of the appliance that is likely to energize it.