The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by ghost307
Today at 06:25 AM
International Wire Colour Codes
by Tjia1981
Yesterday at 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 288 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#51498 - 04/30/05 07:10 PM Bonding fire sprinkler pipe
dmattox Offline

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
I've never bonded sprinkler pipes, never been shown on the plans nor has an inspector required it or asked about it. However, it seems to me that it should be by 250.104. Am I correct in thinking that the sprinker pipe should be bonded?

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#51499 - 04/30/05 07:39 PM Re: Bonding fire sprinkler pipe
Ryan_J Offline

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
If it is likely to become energized, it would be required by 250.104(B).

I could see that a person could argue that this falls under 250.104(A), but I personally disagree.

[This message has been edited by Ryan_J (edited 04-30-2005).]
Ryan Jackson,
Salt Lake City

#51500 - 04/30/05 09:48 PM Re: Bonding fire sprinkler pipe
Larry Fine Offline

Registered: 02/18/05
Posts: 684
Loc: Richmond, VA
I agree with Ryan, although (A) doesn't specifically say "domestic water piping system" and it does say "metal water piping system(s)".

I also like:
"The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means."
Larry Fine
Fine Electric Co.

#51501 - 04/30/05 11:37 PM Re: Bonding fire sprinkler pipe
Trumpy Offline


Registered: 07/05/02
Posts: 8532
Loc: SI,New Zealand
One thing that I would be thinking of, is where a difference in potential could cause a shock hazard.
One thing from the NZ Electrical Regs:
If a metallic part could become energised, it shall be bonded to Earth.

I think personally, that unless you can give real Segregation, between systems, they should be Bonded together.
Just my $0.02 worth.
Let's face it, these days if you're not young, you're old - Red Green grin

#51502 - 04/30/05 11:55 PM Re: Bonding fire sprinkler pipe
e57 Offline

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Where I'm at most sprinkler system piping originates from over-sized domestic water feeds, which are part of the electrode system, so in that way are bonded. I have had to bond dry stand pipes though. And un-like some other areas, (Which I have discovered here on ECN) hot water and gas well at the origin of each source. I'm waiting for the day I have to bond the sewer too.
Mark Heller
"Well - I oughta....." -Jackie Gleason

#51503 - 05/01/05 04:59 AM Re: Bonding fire sprinkler pipe
harold endean Offline

Registered: 02/16/02
Posts: 2248
Loc: Boonton, NJ
Just my 2 cents, but if I see a domestic water pipe entering a building and a fire pipe, I guess that they are bonded together somewhere outside, but I am not sure that they are. So to make a positive bond, I would bond the 2 pipe sytems together again inside of the building where you can see it. Who knows maybe the domestic water could get turned off at the street and/or the connection of the 2 pipe sytems outside of the building might fail.

#51504 - 05/01/05 05:27 AM Re: Bonding fire sprinkler pipe
dmattox Offline

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
The projects I work on usually have hundreds of feet of piping for the sprinklers until they get to the source (running to the PIVs then to the DC). The cold water seems to always be ran in PVC until close to the building. Even if the cold water was ran in copper it would probably be a 500-1000' loop between the two (I am not even sure if they are served by the same source). But would that distance be considered properly bonded?

#51505 - 05/01/05 05:47 PM Re: Bonding fire sprinkler pipe
nesparky Offline

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
Around here the PIV for the sprinkler is just after where the main water service to the prorerty splits into the sprinkler water feed and the domestic water service. We also have a plumping copper ordinance for both services. PIV typically are near a property line so distanc varies from 10 to 200 feet from the building exterior. Because of the above, bonding of the sprinkler pipes is not needed. Since anyone working with the water service has to get inspections by both the water utility and the plumbing inspectors, we do not worry very much about some clown converting the water service to plastic. Have seen the water utility shut off the water for a couple of people who tried. Water stayed shut off untill licensed plumber fixed it.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals