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!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by twh
Today at 06:28 AM
On Delay Relay with Auto Reset
by Potseal
Yesterday at 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 15
HotLine1 10
Trumpy 8
Texas_Ranger 8
sparkyinak 7
Who's Online
0 registered (), 192 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#81994 - 10/11/02 12:43 PM non continous ground wire
gregoryf Offline
Member

Registered: 08/23/02
Posts: 19
Loc: Ketchikan AK USA
I just looked at a house with a 200 amp 1-Ø service. The contractor installed a #4 solid copper conductor to the rebar in the foundation. He attached the conductor to the rebar with an acorn clamp (listed for use on 5/8" ground rod.) He then attached another #4 solid copper conductor to the rebar under the same clamp and connected it to the copper water pipe.
I believe this installation is in violation of the NEC as the ground wire should be continous. I also think the connection to the rebar should be an exothermic weld (Cadweld).
What do you think?

Top
2014 / 2011 NEC & Related Books and Study Guides
#81995 - 10/11/02 01:26 PM Re: non continous ground wire
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
I think the dude cheesed it out, a cadweld would be an improvement, and as it may be undetermined at to the rebar's integrity,( cheesy Ufer too?), a few G-rods would not hurt.

Top
#81996 - 10/11/02 06:23 PM Re: non continous ground wire
Tom Baker Offline
Member

Registered: 10/09/01
Posts: 31
Loc: Bremerton WA
The grounding electrode conductor (GEC) has to be continuous to any available electrode.
From that point the GEC stops and a connection to any other electrode is a bonding jumper. The connection to the rebar is OK if the acorn clamp is listed for direct burial/rebar/concrete encasement.

But two conductors under one clamp is most likely a violation of 110.3(B)
While a cadweld connection may be desirable, Burndy would like you to know they make a compression connection they belive is superior. Whatever is used must be listed for the application.

Top



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