Bonding both hot and hold supply pipes

[Kenton H. Shepard, CMI]

Originally Posted by jtedesco1

No it is a requirement:

See 250.104(B) Other Metal Piping

No, it is not a requirement, Joe. Not nationwide.l Why did you say it was?

[jtedesco1]

Originally Posted by kshepard

No, it is not a requirement, Joe. Not nationwide.l Why did you say it was?

See the NEC Manual of Style for use of terms that are used when identifying various Articles and Sections in the NEC.

When adopted by any Jurisdiction the NEC includes instructions on enforcement procedures in 90.4 (often not clearly understood by some) and see Section 90.5 where "SHALL" is used in any rules in the NEC it is a requirement and is a mandatory term, and unless the local or State modified the NEC it is the law.

If you need further clarification on the question of adoption or interpretation of the rule in question question call the NFPA or IAEI directly and ask for an Official Interpretation.


• 250.104(D): Relocated requirements for bonding water piping and structural metal to separately derived systems from 250.104(A)(4) of 2002 Code.

250.104 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 is likely to 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 is likely to energize the piping system(s). The equipment grounding conductor for the circuit that is likely to energize the piping shall be permitted to serve as the bonding means. The points of attachment of the bonding jumper(s) shall be accessible.

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

NECH COMMENTARY:

"Unlike the metal piping systems covered in 250.104(A), this requirement applies only to metal piping systems that are likely to become energized. What this means is that where metal piping systems and electrical circuits interface through mechanical and electrical connections within equipment, a failure of electrical insulation can result in the connected piping system(s) becoming energized. Gas appliances are a common example of metal gas piping and electrical circuits being connected to a common piece of equipment, and in this case the 250.104(B) requirements apply. The required bonding of these other piping systems can occur at the same locations specified in 250.104(A), or an additional provision within this paragraph permits the equipment grounding conductor of the circuit that is likely to energize the piping as the means for bonding the piping. Typically, the use of an additional bonding jumper is not necessary to comply with this requirement because the equipment grounding connection to the non–current-carrying metal parts of the appliance also provides a bonding connection to the metal piping attached to the appliance. This is a bonding requirement, and the other piping is not being used as an electrode. Therefore, this requirement does not conflict with 250.52(B)(1), which prohibits the use of metal underground gas piping as a grounding electrode for electrical services or other sources of supply."

www.nfpa.org

I stand by my comments!
__________________

[Jeffrey R. Pope]

Originally Posted by kshepard

No, it is not a requirement, Joe. Not nationwide.l Why did you say it was?

Kenton,

Check your local code as it is written. I think you will find that bonding of the metallic water piping is required, even in your area. Whether or not this requirement is enforced, is an entirely separate issue.

[nbhi]

This is not a defect, but it should be called out, correct? What type of wording should be used?

[tdietrich1]

Originally Posted by jtedesco1

No it is a requirement:

See 250.104(B) Other Metal Piping

Any piping that can likely become energized is already 'bonded/grounded" by the circuit that can energize it. Example, 30a circuit to the water heater bonds it also. 120v cicuit to gas stove, has a ground too.



PS I have pipe clamps and 4awg for dedicated bonds in my house. hot 2 cold 2 gas 2 etc

[Jae Williams]

Originally Posted by nbhi

This is not a defect, but it should be called out, correct? What type of wording should be used?

The hot and cold water pipes should be bonded.

“Bonding”is connecting any metallic pipe that may become energized and must be bonded (to ground). Bonding is generally done by connecting a “jumper” wire across the water pipes. Often water heaters are installed with di-electric unions which breaks any grounding path through the heater. Bonding all piping and metal air ducts within the premises will provide additional safety. Any metallic gas lines should also be bonded for safety.

[Barry Adair]

http://www.iaei.org/subscriber/magaz...f/johnston.htm

[nbhi]

Thanks Jae, thats what I am looking for.