Interior gas pipe bonding

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pismo

pismo

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Pismo Beach
I am doing a high-rise condo project and the gas goes to all 89 units. There is one gas service with a manifold type set up for the meters. All of the stubs for the gas are at the manifold. The gas company told me not to bond the pipe at the main. I have all these stubs to bond. Do you think it would be acceptable to bond the first one and rely on the unistrut rack as continuity for the rest? Or do I have to bond every one of them?
 
iwire said:
Why bond at all?

part of 250.104(B)
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Because there are 89 units. I would have to bond somewhere in every unit. All the stubs are at one location. I was thinking maybe if I bond one then the unistrut and strut clamps would provide the bonding on the rest of them.
 
pismo said:
Because there are 89 units. I would have to bond somewhere in every unit.
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Your not following along.

You don't have to do anything, the fact a stove supplied with a circuit including an EGC and is connected to the gas line is all that is required.

It could be a stove, furnace dryer what have you.
 
iwire said:
Your not following along.

You don't have to do anything, the fact a stove supplied with a circuit including an EGC and is connected to the gas line is all that is required.

It could be a stove, furnace dryer what have you.
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What about if they use that nonmetallic flex gas line to the unit?
 
iwire said:
Your not following along.

You don't have to do anything, the fact a stove supplied with a circuit including an EGC and is connected to the gas line is all that is required.

It could be a stove, furnace dryer what have you.
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An appliance connector used to connect the range or furnace to the gas piping system has plastic washers and does not conduct. So how would it bonded?
 
discostu said:
An appliance connector used to connect the range or furnace to the gas piping system has plastic washers and does not conduct. So how would it bonded?
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That's what I thought. So ahh no more gas bonding???
 
pismo said:
That's what I thought. So ahh no more gas bonding???
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My company does the same type of work but we provide a bond wire from the panel at each unit to gas pipe at the water haeter or some other gas stub.
 
discostu said:
My company does the same type of work but we provide a bond wire from the panel at each unit to gas pipe at the water haeter or some other gas stub.
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But the high-rise I'm working on has all the stubs at one location in a utility room. I would like to just bond the first one and rely on the unistrut and clamps to bond the rest of them. I'm a TI man myself so this is new to me.
 
pismo said:
What about if they use that nonmetallic flex gas line to the unit?
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Great question.

Next question would be

In that case how would that appliance energize the gas line?

....The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means....
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If the appliance is connected by an insulating gas connection it can not energize the gas line so it does not have to be bonded.

Read all of 250.104(B)

(B) Other Metal Piping. Where installed in or attached to a building or structure, metal piping system(s), including gas piping, that may become energized shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or to the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with 250.122 using the rating of the circuit that may energize the piping system(s). The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means. The points of attachment of the bonding jumper(s) shall be accessible.
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If all the connections in the buildings gas system than it is not going to be energized.
 
iwire said:
Great question.

Next question would be

In that case how would that appliance energize the gas line?



If the appliance is connected by an insulating gas connection it can not energize the gas line so it does not have to be bonded.

Read all of 250.104(B)



If all the connections in the buildings gas system than it is not going to be energized.
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So if it's in the walls it's not likely to be energized?
 
pismo said:
So if it's in the walls it's not likely to be energized?
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That is not what I said.

What I said was if the gas line is isolated from electrical sources it will not become energized.

FWIW I have never seen a UL listed flexible gas line connection that was non conductive.

I have never seen 'plastic washers' in these lines, usually it is some sort of 'AN" connection that is metal to metal.
 
iwire said:
Pismo, was Pipemasters absence leaving you lonely so now you called in discostu?
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Whatever is the world are you talking about?

If only I could get a clear shot off...
sniperer.gif
wanker.gif
 
iwire said:
That is not what I said.

What I said was if the gas line is isolated from electrical sources it will not become energized.

FWIW I have never seen a UL listed flexible gas line connection that was non conductive.

I have never seen 'plastic washers' in these lines, usually it is some sort of 'AN" connection that is metal to metal.
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Let's say it's all metallic. Do you think the uni-strut and strut clamps would be acceptable for bonding all of them together? That is if I bonded one of them with a say a # 8.
 
pismo said:
Let's say it's all metallic. Do you think the uni-strut and strut clamps would be acceptable for bonding all of them together? That is if I bonded one of them with a say a # 8.
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what would be the difference if you use the strut rack or the bond at the appliance. If its all metal then it is ok
 
discostu said:
what would be the difference if you use the strut rack or the bond at the appliance. If its all metal then it is ok
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Do you think the AHJ will buy it? I'll find out. My inspector is more concerned with the location of the grounding electrode than anything else. I think he's going crazy or senile. He calls himself "The Doctor"
 
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