Grounding of stranded MC in electrical box

Reply

  #1  
Old 05-22-19, 06:02 PM
Member
Thread Starter
Join Date: Jul 2005
Location: Chicago land
Posts: 572
Grounding of stranded MC in electrical box

Just wondering what the codes are for grounding in stranded MC wire in an electrical box.

I have an electrical box with a MC cable cumming from fan, going to power source with MC. In this electrical box I wire in a GFCI.

Typically, a grounding wire is attached to the box with a a grounding screw. All grounds are then connected to that wire with a twist-on connector.

To make the box less crowed I am considering the option to attach an electrical crimp spade (or ring) to both ground wires of the MC cables and attach the two spades with a a ground screw in the back of box. Also, attaching a ground wire from that screw to GFCI ground terminal.

This woudl make the box less crowded. Is this code compliant?
 
Sponsored Links
  #2  
Old 05-22-19, 06:18 PM
Member
Join Date: Nov 2015
Posts: 1,133
Likes Received: 7
It is probably ok since it is just a ground, but most hand held crimpers don't make a very strong crimp and your crimp terminal is most likely unable to handle the full current.

Just getting a ground lug may be a better option.
 
  #3  
Old 05-22-19, 06:35 PM
Member
Thread Starter
Join Date: Jul 2005
Location: Chicago land
Posts: 572
something like this?
https://www.amazon.com/Skywalker-Sig.../dp/B0195V3UBK

It seems such products tend to be for larger wires?
 
  #4  
Old 05-22-19, 09:47 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,021
Likes Received: 167
You could use a ground tail and a green wirenut.
The tail attaches to the box and the grounds can be combined using the green wirenut.

Name:  gw.jpg
Views: 62
Size:  15.0 KB
 
  #5  
Old 05-23-19, 05:23 PM
Member
Thread Starter
Join Date: Jul 2005
Location: Chicago land
Posts: 572
I was trying to de-clutter the box and avoiding the nut
 
  #6  
Old 05-23-19, 07:44 PM
Member
Join Date: Nov 2015
Posts: 1,133
Likes Received: 7
If you have enough wire length, you can strip one of the ground wire farther back, put it under ground screw, then twist remaining wire with another ground wire. Crimp this splice with bare crimp ring (usually used fro ground wire).
You can also eliminate ground wire going to the device (receptacles and switches) by using self grounding receptacles and switches. For some dimmers and smart switches with pigtail wires, you will have to have ground wire to the device.
 
Reply

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


Thread Tools
Search this Thread
Display Modes