ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Another NEC 2017 Question_240/24VAC Txfr-Neutral R
by pcsailor - 09/15/19 04:56 AM
Does a 'normal 3ph-AC motor' include capacitors?
by pcsailor - 09/15/19 12:30 AM
NEC Question_Cord-&-Plug EGC shorter then Neutral
by pcsailor - 09/15/19 12:09 AM
Service Question
by HotLine1 - 09/14/19 01:43 PM
What is this?
by NORCAL - 09/12/19 12:55 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
1 registered members (pcsailor), 243 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Grounding electrode system #214637 12/30/14 03:35 AM
Joined: Feb 2006
Posts: 78
L
lite bulb Offline OP
Member
This is a existing 200 amp service that had a 1 1/2 metal water pipe that was being used as the grounding electrode with (2)5/8 ground rods with # 6 wire as a supplemental electrode it is a block building with no steel. The water pipe is being replaced with pvc what is required with the GEC now that there is no water pipe only the ground rods that has a side walk over them.

2017 / 2014 NEC & Related Books and Study Guides
Re: Grounding electrode system [Re: lite bulb] #214638 12/30/14 10:35 AM
Joined: Apr 2002
Posts: 7,109
HotLine1 Offline
Member
lite bulb:

"250.50 Grounding Electrode System. All grounding electrodes
as described in 250.52(A)(1) through (A)(7) that are
present at each building or structure served shall be bonded
together to form the grounding electrode system. Where
none of these grounding electrodes exist, one or more of
the grounding electrodes specified in 250.52(A)(4) through
(A)(8) shall be installed and used."

Based on the above, the ground rods are it!

You may want to consider checking the integrity of the existing rods. You may also install another of the GEs, and/or check with your local AHJ.

Based on the letter of 250.50, the rods are all that is required, lacking any other available item.



John
Re: Grounding electrode system [Re: lite bulb] #214659 01/03/15 09:39 PM
Joined: Feb 2006
Posts: 78
L
lite bulb Offline OP
Member
They did put 1 1/2 copper back in to replace the main and extended it 3' above the floor then they replaced the overhead copper with pvc then tied back to the existing copper. I was able to tie back to the main water line that was replaced, now they had 3/0 copper run as the GEC to a buss bar and made taps off of that to a SDS and the main. Off of that tap I need to ground the water pipe that was isolated by the pvc and a copper air compressor line, what size wire is needed.

Re: Grounding electrode system [Re: lite bulb] #214660 01/04/15 02:16 AM
Joined: Jul 2004
Posts: 9,389
G
gfretwell Offline
Member
You use 250.66 to bond water lines. Other piping systems can be bonded with a wire sized to 250.122 and the circuit "likely to energize" the pipe. Typically on things like compressor piping, you could use the EGC to the compressor.
(250.104(B))

At my house the shop air line is bonded with a #8 solid but that is what I had handy. wink


Greg Fretwell

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 233
Joined: March 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 11
Popular Topics(Views)
258,518 Are you busy
194,118 Re: Forum
183,620 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3