Ground Rod

Reply

  #1  
Old 10-31-11, 05:06 PM
P
Member
Thread Starter
Join Date: Aug 2010
Location: USA
Posts: 28
Received 0 Votes on 0 Posts
Ground Rod

Due to some new construction I have to move the ground rod connected to a 100 amp breaker box. The rod is original to the house and is imbedded in a 6" concrete patio slab and then (I assume) into the ground. It is connected to the grounding bar by what looks like a 10 ga. romex. The patio slab is now the floor of a closed in sunroom so we have a ground rod inside the room. Question: Can I splice about 6' of 10 ga. wire onto the existing wire,lay it on the slab along side of the sill plate and then take it through the wall where I will reconnect it to a new ground rod outside the building? Also, how far into the ground does the rod have to go?
 
Sponsored Links
  #2  
Old 10-31-11, 05:17 PM
TomZ1's Avatar
Member
Join Date: Sep 2003
Location: New Hampshire
Posts: 174
Received 0 Votes on 0 Posts
The pros will weigh in shortly...but I'm pretty sure the ground wire must be continuous to the rods...with no splices. Also, #10 seems small for this application. I would have expected #6.
 
  #3  
Old 10-31-11, 06:17 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 10,354
Received 46 Votes on 37 Posts
Yes, the ground wire must be continuous to the ground rod. #8 copper ground wire to the ground rod is adequate for a 100 amp service, but you also need to ground to where the metallic water service enters the house with #8 copper or #6 aluminum.
 
  #4  
Old 10-31-11, 06:52 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 13,122
Received 88 Votes on 79 Posts
We always use #6 copper for the grounding electrode conductor due to the fact that if you use wire smaller then #6, it is required to be protected with conduit.
 
  #5  
Old 11-01-11, 04:26 AM
SD515's Avatar
Member
Join Date: Aug 2011
Location: Michigan, USA
Posts: 63
Received 0 Votes on 0 Posts
Your typical ground rod is going to be 8 feet in length and all 8 ft has to be in contact with the soil. The top has to be flush with or below the grade surface, unless the top is protected from physical damage, but then it wouldn’t be in contact with the soil for 8 feet. I normally pound them down 2-3 inches below grade and cover it after the GEC is connected and passed inspection.

Joe and Tolyn have very good points. The GEC has to be continuous to the first electrode, but can be spliced if done by irreversible means (rarely done in residential). If your current wire is only a #10, it would have to be replaced, so no, you can’t splice it. I agree with Tolyn…use #6 so you don’t have to protect it with conduit (usually, for the most part).
 
  #6  
Old 11-01-11, 04:44 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,017
Received 42 Votes on 37 Posts
Thanks guys, you didn't leave anything for me to add that wasn't covered already.
 
  #7  
Old 11-01-11, 05:06 AM
SD515's Avatar
Member
Join Date: Aug 2011
Location: Michigan, USA
Posts: 63
Received 0 Votes on 0 Posts
Sorry. My bad. Won't happen again....
 
  #8  
Old 11-01-11, 05:44 PM
P
Member
Thread Starter
Join Date: Aug 2010
Location: USA
Posts: 28
Received 0 Votes on 0 Posts
Ok, thanks for the info. I thought it would be just an easy "go do" but looks a little more involved. The rod is actually sticking up out of the concrete a good 12" and the ground wire is just connected to the top of it with a clamp. It's been there since the early 70's when the house was built so I guess I'll just leave it be and try to work around it. We're thinking about building a small closet in one corner where the rod is and probably can enclose it in that. Don't know why they did it the way they did. Sounds like it wasn't done right in the first place.
 
  #9  
Old 11-01-11, 05:47 PM
F
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,495
Received 34 Votes on 26 Posts
The #10 conductor is wrong no matter how you look at it but the connection to rebar may be an excellent grounding electrode. Google Ufer ground for more information.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: