How to bond big pull box? - Electrician Talk - Professional Electrical Contractors Forum
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion

Like Tree5Likes
  • 2 Post By RePhase277
  • 3 Post By Cow
Thread Tools Display Modes
Old 09-24-2017, 10:05 AM   #1
Senior Member
Dash Dingo's Avatar
Join Date: Mar 2012
Location: Minnesota
Posts: 707
Rewards Points: 318
Default How to bond big pull box?

I have (6) underground PVC service entrance conduits coming into the basement of a building from the utility transformer.
My main service gear cannot be up against the wall where the conduits enter the building because there mechanical equipment in the way.
However I do have the option of setting a custom made metallic pull box along the wall, bringing my conduits into that and then bringing (6) PVC conduits out of the side of the pull box ran about six feet and into my service gear.
So basically I would have a metallic pull box in between PVC conduits.
There is no EGC ran in the pipes to the transformer from the pull box.
Can I just run one big bonding jumper to bond the box since this is before my main disconnect or do need one in each conduit?
These are 4" conduits.

Sent from my iPhone using Tapatalk
Dash Dingo is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free! - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that is a great community to join. Best of all it's totally free!

Join - Click Here JOIN FOR FREE

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. 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!

Sponsored Links
Old 09-24-2017, 10:10 AM   #2
Registered Member
Join Date: Feb 2008
Location: Alabama
Posts: 11,885
Rewards Points: 1,360

I think you can bond it externally from you gear. Just be sure it's sized correctly.
hardworkingstiff and backstay like this.
RePhase277 is offline   Reply With Quote
Old 09-24-2017, 11:19 AM   #3
Senior Member
Join Date: Jan 2008
Location: Eastern Oregon
Posts: 3,037
Rewards Points: 4,910

What you're looking for is called a supply side bonding jumper.

250.102(C)1 will get you started. It will get sized the same just like if you were bonding a CT cabinet or similar.
Cow is online now   Reply With Quote
The Following User Says Thank You to Cow For This Useful Post:
hardworkingstiff (09-24-2017)
Sponsored Links
Old 09-25-2017, 12:08 PM   #4
Senior Member
FaultCurrent's Avatar
Join Date: May 2014
Location: California
Posts: 496
Rewards Points: 931

You can use the neutrals to bond the enclosures. Bond the neutrals to the pull box and UGPS and you don't need separate jumpers.
At it since 1971 and still going....kind of.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Grandpa was old, and he was slow. But he got there.
FaultCurrent is offline   Reply With Quote
Old 09-25-2017, 12:13 PM   #5
Senior Member
sbrn33's Avatar
Join Date: Mar 2007
Location: middle america
Posts: 11,557
Rewards Points: 3,516

He is right. Think of it as a meter socket. Really no difference.
sbrn33 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
314.28 Straight Pull Awh123 NEC Code Forum 11 10-05-2017 12:10 AM
Pull Box size calculation - Parallel conductors TOOL_5150 NEC Code Forum 7 03-21-2017 12:08 AM
Cable management at pull points [email protected] Structured Wiring 8 12-21-2016 11:47 AM
Transformer neutral bond sizing (paralleled secondary) haltonelectrician Canadian Electrical Forum 27 06-19-2016 07:21 PM
Importance of bond graphs Cantafford General Electrical Discussion 0 01-12-2016 05:22 AM

All times are GMT -4. The time now is 10:31 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Our Pro Sites Network | | | | |