I have a square D 200 amp 40 circuit panel. Can anyone tell me if and when I need to install the “Neutral Terminal Kit” that came with the panel?
I have a disconnect at the meter as well as a disconnect at the panel. My incoming service wire from the meter disconnect is 4/0 aluminum (2 hots, 1 neutral, no ground.)
Also do I need to install the green “Box Bonding Screw” in this instance.
Thanks for the advice.
“Just because I’m paranoid doesn’t mean they’re not after me.”
Replies
Who has done the work so far?? Did the power company run these lines to your house?
If you have an electrical inspector overseeing the job, I would ask him what he wants you to do.
Where we work, the disconnect at the meter becomes the main service disconnect and thus your 200 amp panel becomes a subpanel and must have the grounding bar installed and the neutral bar floating. We are required to run a #4 bare ground from the meter disconnect to the 200 amp panel and also install a separate grounding system at the panel.
Your inspector may handle it differently?
It's a little fuzzy, but you need one of two setups:
1) 3 wires (hot/hot/neutral with no separate ground) run to the panel. Bonding screw installed. No requirement for separate ground and neutral buses.
2) 4 wires (hot/hot/neutral/ground) run to the panel. Bonding screw NOT installed. Separate ground and neutral buses must be used.
In some situations metal conduit may be permitted to substitute for the ground wire in scenario #2, though that is not ideal.
Normally, if the service entrance has a disconnect separate from the panel and there's any distance between the two, then #2 must be used. But this depends a bit on local code and power company rules.
Very appreciative, good call, thank you-