Grounding of stranded MC in electrical box


  #1  
Old 05-22-19, 06:02 PM
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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?
 
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Old 05-22-19, 06:18 PM
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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.
 
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Old 05-22-19, 06:35 PM
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something like this?
https://www.amazon.com/Skywalker-Sig.../dp/B0195V3UBK

It seems such products tend to be for larger wires?
 
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Old 05-22-19, 09:47 PM
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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.

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Old 05-23-19, 05:23 PM
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I was trying to de-clutter the box and avoiding the nut
 
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Old 05-23-19, 07:44 PM
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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.
 
 

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