ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
sparky 5
Recent Posts
Holiday Wishes to all!!
by HotLine1. 12/15/17 07:20 PM
Dimmable LED 2x4 lay in fixtures
by HotLine1. 12/15/17 07:15 PM
2017 NEC Changes
by HotLine1. 12/15/17 07:06 PM
Casino Wiring methods
by HotLine1. 12/09/17 10:44 AM
Ground wire Size to water Line.
by HotLine1. 12/05/17 12:11 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,072 Are you busy
179,513 Re: Forum
170,428 Need opinion
Who's Online Now
0 registered members (), 17 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#163022 - 04/29/07 10:41 AM GEC and sprinkler system  
leespark  Offline
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

#163024 - 04/29/07 10:53 AM Re: GEC and sprinkler system [Re: leespark]  
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.


Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,708
Joined: October 2000
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 15 (0.002s) Memory: 0.7447 MB (Peak: 0.8624 MB) Zlib enabled. Server Time: 2017-12-16 15:04:16 UTC