Resistance Grounded - Electrician Talk - Professional Electrical Contractors Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion


Like Tree7Likes
  • 2 Post By brian john
  • 1 Post By drsparky
  • 2 Post By drsparky
  • 1 Post By emtnut
  • 1 Post By drsparky
Reply
 
Thread Tools Display Modes
Old 09-04-2017, 06:00 AM   #1
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,907
Rewards Points: 1,586
Default Resistance Grounded

Members have questioned how to resistance ground an electrical distribution system THIS AIN'T HOW.
Attached Thumbnails
Resistance Grounded-img_0228.jpg  

micromind and readydave8 like this.
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - 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 ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - 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. ElectricianTalk.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!

Sponsored Links
Advertisement
 
Old 09-04-2017, 06:03 AM   #2
Retired Account
 
Join Date: Mar 2011
Location: the Green Mountain state
Posts: 39,722
Rewards Points: 14,650
Default

Ok, and you'll kindly 'splain why it ain't Brian? ~CS~
chicken steve is offline   Reply With Quote
Old 09-04-2017, 06:26 AM   #3
Senior Moment
 
drsparky's Avatar
 
Join Date: Nov 2008
Location: Presque Isle, Maine
Posts: 7,507
Rewards Points: 490
Default

Looks like a Harger GBU ground bar. The flat washers do not belong there.
micromind likes this.
__________________
Sent by Commodore Vic 20 with 9.6K modem
drsparky is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-04-2017, 06:31 AM   #4
Retired Account
 
Join Date: Mar 2011
Location: the Green Mountain state
Posts: 39,722
Rewards Points: 14,650
Default

Unless they're Belleville washers, no...~CS~
chicken steve is offline   Reply With Quote
Old 09-04-2017, 06:43 AM   #5
Senior Moment
 
drsparky's Avatar
 
Join Date: Nov 2008
Location: Presque Isle, Maine
Posts: 7,507
Rewards Points: 490
Default

Quote:
Originally Posted by chicken steve View Post
Unless they're Belleville washers, no...~CS~
The flat part of the lug should have full contact with the buss bar (with a little non oxidizing grease).
micromind and glen1971 like this.
__________________
Sent by Commodore Vic 20 with 9.6K modem
drsparky is offline   Reply With Quote
Old 09-04-2017, 06:47 AM   #6
Retired Account
 
Join Date: Mar 2011
Location: the Green Mountain state
Posts: 39,722
Rewards Points: 14,650
Default

Yes, that would be the norm Doc ~CS~
chicken steve is offline   Reply With Quote
Old 09-04-2017, 07:14 AM   #7
Band Member
 
emtnut's Avatar
 
Join Date: Mar 2015
Location: Eastern Ontario
Posts: 5,735
Rewards Points: 848
Default

That looks like it's made of wood
mgraw likes this.
__________________
_____________________________________
Your Mother was a hamster, and your father smells of Elderberries. ... Now go away, or I shall taunt you a second time
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
emtnut is offline   Reply With Quote
Old 09-04-2017, 08:08 AM   #8
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Quote:
Originally Posted by brian john View Post
Members have questioned how to resistance ground an electrical distribution system THIS AIN'T HOW.
Can we calculate the surface area for those washers without assuming any on the opposite side and compare it to the area of the lug face?
Southeast Power is offline   Reply With Quote
Old 09-04-2017, 08:56 AM   #9
Registered Member
 
Join Date: Feb 2008
Location: Alabama
Posts: 11,885
Rewards Points: 1,360
Default

Quote:
Originally Posted by Southeast Power View Post
Can we calculate the surface area for those washers without assuming any on the opposite side and compare it to the area of the lug face?
Well sure you can. Let's say the lug is 1" wide by 4" long. That's an area of 4 square inches. If the washers are 1.5" diameter, they have an area of 1.767 square inches each, totaling 3.534 square inches.

However, not all of that area is in contact with the lug due to the space between them and the area of the washers not in contact with the lug. At any rate, the lug contact area is less than 3.534 square inches.
RePhase277 is offline   Reply With Quote
Old 09-04-2017, 09:29 AM   #10
Band Member
 
emtnut's Avatar
 
Join Date: Mar 2015
Location: Eastern Ontario
Posts: 5,735
Rewards Points: 848
Default

I still think it looks like a piece of wood ... which would be high resistance depending on the humidity


V.R.H.R.G.S
__________________
_____________________________________
Your Mother was a hamster, and your father smells of Elderberries. ... Now go away, or I shall taunt you a second time
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
emtnut is offline   Reply With Quote
Old 09-04-2017, 09:39 AM   #11
Moderator

 
Dennis Alwon's Avatar
 
Join Date: May 2009
Location: Chapel Hill, NC
Posts: 21,116
Rewards Points: 1,262
Default

Quote:
Originally Posted by emtnut View Post
I still think it looks like a piece of wood ... which would be high resistance depending on the humidity


V.R.H.R.G.S
I agree - it's a piece of wood.
__________________
They say I shot a man named Gray and took his wife to Italy
She inherited a million bucks and when she died it came to me
I can't help it if I'm lucky
Dennis Alwon is online now   Reply With Quote
Old 09-04-2017, 09:39 AM   #12
Senior Member
 
Bird dog's Avatar
 
Join Date: Oct 2015
Location: South East US
Posts: 4,936
Rewards Points: 1,646
Default

If I have 2" long bolts, the threads don't go all the way to the head, so, they can't be used on everything.
__________________
Popcorn munching forum observer
"The supreme art of war is to subdue the enemy without fighting." Sun Tzu
Bird dog is online now   Reply With Quote
Old 09-04-2017, 09:48 AM   #13
Senior Moment
 
drsparky's Avatar
 
Join Date: Nov 2008
Location: Presque Isle, Maine
Posts: 7,507
Rewards Points: 490
Default

Quote:
Originally Posted by Southeast Power View Post
Can we calculate the surface area for those washers without assuming any on the opposite side and compare it to the area of the lug face?
You have to go by the manufacture instructions. In the communication facilities, those washers would fail R56 standards and an audit.
brian john likes this.
__________________
Sent by Commodore Vic 20 with 9.6K modem
drsparky is offline   Reply With Quote
Old 09-04-2017, 10:14 AM   #14
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,907
Rewards Points: 1,586
Default

Quote:
Originally Posted by Dennis Alwon View Post
I agree - it's a piece of wood.
It is copper bus
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Reply

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
DC Resistance Q. jonathankreusch General Electrical Discussion 4 07-02-2017 02:48 PM
Clarification to Grounded or Not Grounded Post LDMiller General Electrical Discussion 45 09-19-2016 02:57 PM
Proper Protocol for Grounded Box blinx77 NEC Code Forum 5 08-18-2016 06:03 PM
Ground to Neutral Resistance lynes.nathan General Electrical Discussion 20 08-05-2016 01:48 PM
Grounded or Not? LDMiller General Electrical Discussion 21 04-23-2016 09:09 AM


All times are GMT -4. The time now is 09:24 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com