bonding to gas pipe in apt. bldg.

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tgri5th

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Several of the buildings we are wiring have gas services run to them. The water heaters and fireplaces are the only equipment used for the gas. Our AHJ is requiring us to run a #10 from where each gas service enters the building to the closest subpanel in the building. Some of the buildings have up to 3 points of entry with the gas. So we have been taking 3 separate jumpers to the closest panel. Does this seem logical for a requirement? Also can anyone explain to me using the equipment grounding conductor of the circuit that may energize the piping system is done. Do you take a jumper from the gas pipe to the outlet supplying the equipment? In some of the buildings we have 12 separate units. Would bonding be required at each fireplace or at just on per gas service?

Thanks, Tom
 
Re: bonding to gas pipe in apt. bldg.

Here i use #4 at entry to building(bit over kill but no protection needed).Watch out while AHJ wants it bonded some gas companies don't TECO is one of them.They are afraid if we lose our neutral that we are causing them a hazard.
 
Re: bonding to gas pipe in apt. bldg.

You bond the pipe. A unit *may* supply this bond if they're electrically connected (a lot of gas water heaters won't be)

Three lines coming in - three bonds.

Check 250.104(B) - gas is "other piping"

Taking a bond to a sub looks questionable. The wording has it going to service enclosure, grounded service conductor, GEC, or one of the electrodes.
 
Re: bonding to gas pipe in apt. bldg.

AHJ here forces the bond.I try to get along so i just do it.On little stuff i won't fight them,seems to pay off.I don't want to just win a battle i wan't to win the war.Was taught this from day one.
 
Re: bonding to gas pipe in apt. bldg.

If the waterheaters or gas fireplace are fed from an electrical circuit that has an equipment ground conductor installed, then there is no need for further bonding of the gas piping (250.104(B) as Tonyi has mentioned).
250.104(B) also requires the bond to be installed back to the service enclosure, grounded conductor at the service, the grounding electrode if of sufficient size or the ground electrode. It does not say a subpanel.
Sizing can vary, I believe that the 10 wire would be adequate in most instances.

Pierre
 
Re: bonding to gas pipe in apt. bldg.

Ok I'm with you most of the way.Now if my fireplace was fed from the sub panel what happens?
When they replace that fire place with a non AC one,then what happens to the gas pipe feeding the water heater,all but one of these water heaters i have seen do not use electric.And the last several fireplaces have low voltage wiring to a switch and no ac hook up.If the wiring was adequate for bonding then why to we need to bond water lines if metal(#10 grd is hooked to water heater)
 
Re: bonding to gas pipe in apt. bldg.

In these apt. blgs there are 4 separate units fed from each gas service. Would you say that a bonding jumper would have to be ran from each fireplace (12 in all) back to the service location? What our AHJ is having us do is bond at the entry point back to the closest subpanel. He is not letting us bond at the fireplace because he is saying that the bond would not be accessable. We've went ahead and followed his requirements but I'm just wanting to know what is the correct way for bonding in this situation. Also the gas pipe is transfered to flex before it drops to the appliance location.
 
Re: bonding to gas pipe in apt. bldg.

The right way would be to bond back to the the service/GEC/electrode, not to a sub.
 
Re: bonding to gas pipe in apt. bldg.

Inspectors here are happy if we bond it where it enters the building.See nothing saying i must have it bonded at each item.
 
Re: bonding to gas pipe in apt. bldg.

If you're not using a unit gnd for the bond, then you bond the pipe, not the unit. There's no requirement it be nearest point of entry for "other" piping - any (accessable) point on the pipe will do.
 
Re: bonding to gas pipe in apt. bldg.

Did run into one inspector that insisted it be point of entry.I had it bonded at the dryer with #4 to service that was only 5 feet away.Made us change it.This was in an isolated city that gives 2 hour inspections to fill his day.But yes any point would be fine.
 
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