splicing the ground

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westelectric

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westchester county, NY
I have (6) 12/2 rx's entering a trough that is nippled above a panel. I would like to splice all grounds in a wirenut in the trough and tail (1) down into the panel and land it on the ground bar. Question: Is only (1) #12 ground enough?
 
A #12 would be code compliant. You size the ground based on overcurrent protection and increase its' size when current carrying conductors size is increased.
 
westelectric said:
Why use an 8 when i can use a 12. Im just wondering whats required. Can I find this in the code somewhere how to calculate whats required
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A number 12 would be fine, the code reference is 250.122(C)

Roger
 
I don't believe you can make any assumptions about the neutrals as far as which leg they are currently on and whether they cancel. I think you're going to have to add the current on each neutral to have one large enough. Only thing you can do is forget about the 125% continuous load factor, since it isn't terminating on a breaker.
 
ground splice

ground splice

roger said:
A number 12 would be fine, the code reference is 250.122(C)

Roger
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Help me understand 250.122 (C), In the 08 NEC it says grounding conductor run with multiple circuits in the same raceway, cable, or cahle tray. Question the post refers to using (6) #12 NM's. To me its not compliant with 250.122 (C). I'm aleays ready to learn my mistakes, Thanks :D:D
 
lowryder88h said:
Help me understand 250.122 (C), In the 08 NEC it says grounding conductor run with multiple circuits in the same raceway, cable, or cahle tray. Question the post refers to using (6) #12 NM's. To me its not compliant with 250.122 (C). I'm aleays ready to learn my mistakes, Thanks :D:D
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Basically what 250.122(C) states is if you have a raceway with say 20 amp and 40 amp circuits then you need to ground to the largest ocp. Thus a #10 wire would be needed. If they are all #12 wires then a #12 egc is all you need.
 
lowryder88h said:
Help me understand 250.122 (C), In the 08 NEC it says grounding conductor run with multiple circuits in the same raceway, cable, or cahle tray. Question the post refers to using (6) #12 NM's. To me its not compliant with 250.122 (C). I'm aleays ready to learn my mistakes, Thanks :D:D
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As Dennis said, the largest OCPD determines what size the EGC will be and if the largest conductor spliced in the group is a #12 (regardless of how many) on a 20 amp OCPD then a single #12 EGC is all that is required to the ground bar

Roger
 
For the neutrals I would get a isolated neutral bar kit and just install the neutrals there. You would not need any other wire for that.

Also if the ground bar is connected to the can then you don't need to worry about that either.
 
Dennis Alwon said:
For the neutrals I would get a isolated neutral bar kit and just install the neutrals there. You would not need any other wire for that.

Also if the ground bar is connected to the can then you don't need to worry about that either.
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Re read post 1. The splice is in a trough nippled to the panel. I would need a neutral from the panel to splice of neutrals in the trough
 
westelectric said:
Re read post 1. The splice is in a trough nippled to the panel. I would need a neutral from the panel to splice of neutrals in the trough
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The OP wants to terminate 6 equipment grounding conductors in the trough. If the trough and nipple to panel are metallic then they are approved EGC's and landing them on a terminal bar bolted to trough is all that is necessary. Paint removal at the terminal bar location is probably going to be required to ensure good bonding.
 
westelectric said:
Re read post 1. The splice is in a trough nippled to the panel. I would need a neutral from the panel to splice of neutrals in the trough
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You can splice all 6 neutrals directly to the panel- No? Or is there no room to do this?

I am missing something. What is in the trough, just 6 NM cables? Are 3 the line and 3 the load? If there is a nipple just splice each wire thru.
 
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