To Bond Or Not To Bond,That Is The Question - Electrical - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical


Thread Tools Display Modes
Old 03-23-2005, 12:22 PM   #1
Join Date: Mar 2005
Posts: 1
Rewards Points: 10

To bond or not to bond,That is the question

External building (Shed), with NO water supply or pipes going to main building, 120/240VAC 60A Underground service, 115 feet away from main. 8' Copper Electrode at BOTH buildings. In THIS case I would think A BONDING to the N-Bus to be correct as the Main house is far away and no pipes connect the two. So a ground to the house would not be preferred by electricity over the local ground rod. Furthermore, Any Electricity or faults from the House (MAIN) would prefer to go to the Main's Local grounding rod and water pipes over traveling all the way to the Sheds Ground rod. At all time keeping the ground INSIDE the underground conduit NON-Charged, as well as any service ground remaining UN-Charged such as phone and appliances.

Now If there were pipes connecting the 2 buildings then the N-Bus would NOT be bonded as a fault could prefer the Pipes ground over the Rods grounds, traveling through the non-Fused water pipes looking for the First Ground which may result in being the plumber.

If I were installing a sub-panel IN the House I would NOT bond as a fault might travel through the ground wire or the Neutral and cause a possible shock or a 240V load to the 120V circuits risking a fire. Do I have it right?. Or am I still way off?
__________________________________________________ __
NEC code rule#1) If it is easier.. its wrong.
NEC code rule#2) If it is cheaper ... Its wrong
NEC code rule#3) Pay your inspector and see rule#1


generaltzao is offline   Reply With Quote
Old 03-23-2005, 04:22 PM   #2
Electrical Contractor
jbfan's Avatar
Join Date: Jun 2004
Location: Newnan GA
Posts: 6,979
Rewards Points: 554

IMO a subpanel in a seperate building, do not connect the N_G together. Are you feeding with a 4 wire feed?


"The problem isn't that Hillary Clinton lies. We all know she lies. The problem is that her supporters don't seem to care"
jbfan is offline   Reply With Quote
Old 03-26-2005, 08:40 AM   #3
Licensed Electrical Cont.
Speedy Petey's Avatar
Join Date: Feb 2004
Location: NY State
Posts: 7,812
Rewards Points: 1,974

You are generally correct. The only thing is the purpose of a ground rod, or the ground itself is not to clear a fault. It is to stabilize the electrical system in the event of a very short term high current fault such as lightning.
Grounding and grounding electrode systems can be an extremely confusing subject.

Bottom line is if you ran a 4-wire feeder to the out building then the neutrals and grounds are NOT bonded in the sub-panel.
If there are not other metallic paths between bulidings and if there is a 3-wire feeder then they DO get bonded.
This is regardless of any ground rods, they are required at each building in ANY case.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Speedy Petey is offline   Reply With Quote

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Basement Renovation Question KUIPORNG Remodeling 234 08-26-2008 08:19 AM
Concrete block - bond pattern tvoltz Building & Construction 1 06-11-2007 06:36 PM
General easy drywall question bigboyjoel Building & Construction 3 05-27-2007 08:52 AM
can light question trptman Electrical 13 04-19-2007 05:11 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1