Vent Bonding

[aaronm]

Am I correct in my reading of the following to mean that all gas appliance vents must have bonding jumpers installed?

NEC 90.5 Mandatory Rules, Permissive Rules, and Explanatory Material

(A) Mandatory Rules. Mandatory rules of this Code are those that identify actions that are specifically required or prohibited and are characterized by the use of the terms shall or shall not.


NEC 205.104 Bonding of Piping Systems and Exposed Structural Steel

(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 one or more of the 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 a bonding means. The points of attachment of the bonding jumper(s) shall be accessible.

FPN: Bonding of all piping and metal air ducts within the premises will provide additional safety.

 

[ivsenroute]

not normally as they are bonded to the appliance that they are connected to which should be already bonded.

 

[480sparky]

I would call the vent a duct, not a pipe.

 

[aaronm]

not normally as they are bonded to the appliance that they are connected to which should be already bonded.

Ivensroute: Does the gas appliance vent need to be mechanically conntected to the appliance in order to achieve a proper bond? That is to say, would the vent connection need to be via sheet metal screws?

 

[Cavie]

I would call the vent a duct, not a pipe.

PO is refering to FPN at the bottom of his post

 

[Hendrix]

"The equipment grounding conductor for the circuit that may energise the piping shall be permitted to serve as a bonding means"

OK nevermind

 

[480sparky]

PO is refering to FPN at the bottom of his post

FPNs are not enforceable.

 

[infinity]

"The equipment grounding conductor for the circuit that may energise the piping shall be permitted to serve as a bonding means"

That pretty much covers it. Nothing extra is required.

 

[aaronm]

That pretty much covers it. Nothing extra is required.

Rob: What about gas water heaters?

 

[raider1]

Rob: What about gas water heaters?

What about gas water heaters?

The flue on a gas water heater does not need to be bonded. As already pointed out a gas vent is not a piping system.

If there is a metal water piping system connected to the water heater then that must be bonded in accordance with 250.104(A).

Chris

 

[aaronm]

Thanks to all.