ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
This anti-theist is priceless!!!
by djk. 11/14/18 07:19 AM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
Black & Decker Recalls Hammer Drills
by Admin. 11/01/18 07:22 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 13 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
GEC and sprinkler system #163022
04/29/07 10:41 AM
04/29/07 10:41 AM
L
leespark  Offline OP
Member
Joined: Jan 2004
Posts: 54
Massachusetts
How should I handle the grounding electrode system for a 400 amp service?

I plan on installing a 1/0 copper from the main disconnect to the within 5' of where the water service enters the building and jump the water meter unspliced. I am also installing a #6 from the main disconnect to 2 ground rods spaced at least 6' apart.

However, this building has a separate incoming water service for the sprinkler system. Can I install a bonding jumper sized according to 250.66 (1/0) from the sprinkler service to the water service and connect it to the GEC using a split bolt? Or should this conductor also be run back to the main disconnect? I'm a little confused by 250.70 which I beleive is referring to my situation.

Thanks

2017 / 2014 NEC & Related Books and Study Guides
Re: GEC and sprinkler system [Re: leespark] #163024
04/29/07 10:53 AM
04/29/07 10:53 AM
A
Alan Nadon  Offline
Member
Joined: Mar 2005
Posts: 399
Elkhart, IN. USA
There are different ways of doing this and complying with the Code.
1. From the sprinkler system (within 5 foot of entry*) take the wire to the service.
2. From the sprinkler (within...*) take the wire to the GEC and use an irreversable crimp, not a split bolt.
3. From the sprinkler take the wire to the water pipe and use a pipe clamp.
4. If you have building steel go from the service to the steel. Then you can take the water to the steel and the sprinkler to the steel.
The last method saves alot of copper.
Alan--



Alan--
If it was easy, anyone could do it.

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
Popular Topics(Views)
251,479 Are you busy
188,672 Re: Forum
178,373 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 15 (0.004s) Memory: 0.9436 MB (Peak: 1.0599 MB) Zlib enabled. Server Time: 2018-11-15 16:53:53 UTC