Understanding The Bond Screw

 
Thread Tools Search this Thread Display Modes
Old 12-15-2011, 09:21 PM   #1
Pro
 
bluebird5's Avatar
 
Trade: Licensed G. C. carpenter, flooring, remodeling
Join Date: Dec 2010
Location: hendersonville, tennessee
Posts: 761
Rewards Points: 562

Understanding The Bond Screw


I do not understand when to and when not to use the bond screw in panels. I the panel is a subpanel it goes in on the ground side to bond the panel to ground incase it ever got charged right? If the panel does not have the ground and neutral isolated do you need the bond screw. It just seems to me like you would use it every time to bond the panel to to the neutral or ground.
bluebird5 is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   
 

Old 12-15-2011, 09:32 PM   #2
Goin' Down in Flames....
 
Seven-Delta-FortyOne's Avatar
 
Trade: Highwayman
Join Date: Mar 2011
Location: Somewhere Between Heaven And Hell
Posts: 2,005
Rewards Points: 1,498

Re: Understanding The Bond Screw


On most panels, the grounding bar is already bonded to the case. The grounding screw is there to connect the neutral and ground together, only at a main panel. On sub-panels, the neutral and ground are isolated.

Seven-Delta-FortyOne is offline  
The Following User Says Thank You to Seven-Delta-FortyOne For This Useful Post:
bluebird5 (12-15-2011)
Old 12-15-2011, 09:34 PM   #3
I own stock in FotoMat!
 
480sparky's Avatar
 
Trade: DEFENDER OF FREEDOM ADVOCATE OF LIBERTY!
Join Date: Jan 2009
Location: Iowa
Posts: 8,807
Rewards Points: 3,050

Re: Understanding The Bond Screw


As a general rule, after the first point of disconnect, you need to separate the neutral & ground conductors. If you don't use the panel as the FPOD, then you do not use the bonding screw.
__________________
Never believe everything you read on the internet --Thomas Jefferson
480sparky is offline  
The Following User Says Thank You to 480sparky For This Useful Post:
bluebird5 (12-15-2011)
Old 12-15-2011, 09:41 PM   #4
Pro
 
bluebird5's Avatar
 
Trade: Licensed G. C. carpenter, flooring, remodeling
Join Date: Dec 2010
Location: hendersonville, tennessee
Posts: 761
Rewards Points: 562

Re: Understanding The Bond Screw


ok so main panel use it. Subpanel don't use it. What is the purpose of bonding the panel to the neutral bar?
bluebird5 is offline  
Old 12-15-2011, 09:48 PM   #5
I own stock in FotoMat!
 
480sparky's Avatar
 
Trade: DEFENDER OF FREEDOM ADVOCATE OF LIBERTY!
Join Date: Jan 2009
Location: Iowa
Posts: 8,807
Rewards Points: 3,050

Re: Understanding The Bond Screw


Quote:
Originally Posted by bluebird5 View Post
ok so main panel use it. Subpanel don't use it. What is the purpose of bonding the panel to the neutral bar?
Because, in a main panel, the neutral is the conductor that will carry any fault current the box has back to the source of power, allowing the breaker to open properly.

In a subpanel, the ground wire performs that duty.
__________________
Never believe everything you read on the internet --Thomas Jefferson
480sparky is offline  
The Following 2 Users Say Thank You to 480sparky For This Useful Post:
bluebird5 (12-16-2011), Winchester (12-16-2011)
Old 12-17-2011, 09:52 AM   #6
Member
 
SemiRetiredEL's Avatar
 
Trade: Electrial Contractor (master)
Join Date: Nov 2009
Posts: 77
Rewards Points: 75

Re: Understanding The Bond Screw


As was already mentioned, with few exceptions, the neutral and the ground buss can only be tied together at the service disconnect.

But, every metal enclosure is required to be grounded/bonded but a ground screw is not the only method (2011 NEC):

250.8 Connection of Grounding and Bonding Equipment.

Changed From 2008

•250.8: Revised to include specific reference to grounding electrode conductors and to delete reference to grounding conductor.

(A) Permitted Methods. Equipment grounding conductors, grounding electrode conductors, and bonding jumpers shall be connected by one of the following means: See related UL

(1) Listed pressure connectors

(2) Terminal bars

(3) Pressure connectors listed as grounding and bonding equipment

(4) Exothermic welding process

(5) Machine screw-type fasteners that engage not less than two threads or are secured with a nut

(6) Thread-forming machine screws that engage not less than two threads in the enclosure

(7) Connections that are part of a listed assembly

(8) Other listed means
SemiRetiredEL is offline  
The Following User Says Thank You to SemiRetiredEL For This Useful Post:
bluebird5 (12-17-2011)
Old 01-07-2013, 04:16 PM   #7
Registered User
 
Philby's Avatar
 
Trade: Electrical
Join Date: Jan 2013
Posts: 1
Rewards Points: 10

Re: Understanding The Bond Screw


1st time on site. Love that quote! Going to use it.

Philby is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Surety Bond for Contract on Indian Reservation lamanitta Business 11 07-17-2014 08:03 PM
Blanket building bond in El Paso OlyOlyPB915 Business 1 03-04-2011 01:30 AM
CA to allow Contractor LLC's with New Bond SuretyPro Contractor Licensing 8 12-15-2010 03:14 PM
stocking service trucks MO-AMPS Electrical 23 11-25-2009 09:39 PM
HVAC License vs Bond? Brian82 Contractor Licensing 2 08-20-2009 04:04 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?