Grounding 200 amp panel from meter main service

crtemp

Senior Member
Location
Wa state
If I have a 200 amp meter main installed in dwelling, and I am feeding a 200 amp panel in the house with 4/0 aluminum SER, do I have to ground the panel with the ground wire that is in the SER jacket, or can I run a separate #6 copper to the panel and use that? The SER comes with three 4/0 and one 2/0 wire. The only reason I’m trying to do this is there is not a spot in the 200 amp panel that can accept the 2/0 ground wire. I’m having to get a big enough lug and tap it to the case. It would just be cheaper and easier for me to run the #6 and not hook up the 2/0 ground in the meter main or panel. Not sure if it’s code to use a separate ground than what is supplied in the feeder assembly.
 

Buck Parrish

Senior Member
Location
NC & IN
You're suppose to use the #2 . You can get a 2/0 lug that will screw to a grd bar. One with feet that goes in two holes or one that straddles the bar and screws in . Is the panel you're feeding a main breaker panel? If so you'll want to add a grd bar and isolate it as you already know.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
No for two reasons:

1. The EGC is supposed to be contained within the same conduit or cable jacket as the other conductors.

2. A #6 cu conductor is not large enough for an EGC for a 200a feeder; you'd need #4 cu.

I would think an accessory lug is cheaper and easier than running another wire.
 

crtemp

Senior Member
Location
Wa state
No for two reasons:

1. The EGC is supposed to be contained within the same conduit or cable jacket as the other conductors.

2. A #6 cu conductor is not large enough for an EGC for a 200a feeder; you'd need #4 cu.

I would think an accessory lug is cheaper and easier than running another wire.
On your #2 reason, isn’t #6 big enough per 250.122?
 
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