ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
UL 508A SPACING
by ale348 - 03/29/24 01:09 AM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 372 guests, and 18 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#79769 01/22/02 02:04 PM
Joined: Oct 2001
Posts: 81
G
Member
Does any one know of a requirement on the number of threads a bolt should have when bolting down a attachment for bonding. According to URL if the size of conductor is a #6 wire then it should be secured by a 1/4 bolt, it does not state what is considered enough threads to have a secure hold. I have heard a minuim of three complete threads but I can't find anything to back this up with the way it is written it looks like you could get away with a half of thread as long as it looked secure.
Anyone one got any ideas?

Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

#79770 01/22/02 07:17 PM
Joined: Dec 2000
Posts: 4,294
Member
Interesting!
With the thickness of a 4-S box (.0625"), and pitch of a 10-32 ground screw (.03125"), you get less than 2 threads fully engaged.
With a box >100sq" (.053") and a 1/4-28 NFT screw's pitch (.0357") you get less than a turn and a half of screw engaged.

#79771 02/11/02 03:51 PM
Joined: Feb 2002
Posts: 4
B
Junior Member
I would think you would have to use all the threads that the nut consumes.anything past the nut does nothing.Every thread not used under the nut would be weaker at every 360 degrees.Just my opinion.

#79772 03/06/02 11:59 AM
Joined: Mar 2002
Posts: 18
D
DB Offline
Member
For bonding large wires (above 12GA) in junction boxes use a servit post. A servit post is like a split bolt connector (a servit) but it has a stud on the end that is used to bolt it to the box.

This make a very solid connection. Burdy (FCI) makes a fine product.


DB

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5