Feed thru panel

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smkie

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If i were to put a feed thru 200A panel to feed another 200A panel, would the second panel have to have the neutrals and grounds seperated because i would be running 4 conductors. Im a little confused because its not quite a sub panel ?
 
smkie said:
If i were to put a feed thru 200A panel to feed another 200A panel, would the second panel have to have the neutrals and grounds seperated because i would be running 4 conductors. Im a little confused because its not quite a sub panel ?
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I will tell you this... It is a sub panel. If you are running 4 wires and the panel is single phase then think about why you need 4 wires. If they were not separated then you really wouldn't need 4 wires.
 
smkie said:
If i were to put a feed thru 200A panel to feed another 200A panel, would the second panel have to have the neutrals and grounds seperated because i would be running 4 conductors. Im a little confused because its not quite a sub panel ?
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Welcome to the forum. It depends on where the second panel is, and what code cycle you're under. Under 05' ,,,if the second panel is in another building, and if there were no other metallic paths between the two, then you could have 3 wires. But under '08, you would need the fourth wire. If both panels are in the same structure, yes, the second panel is a supanel and needs the fourth wire and neutrals and grounds seperated.
 
smkie said:
If i were to put a feed thru 200A panel to feed another 200A panel, would the second panel have to have the neutrals and grounds seperated because i would be running 4 conductors. Im a little confused because its not quite a sub panel ?
Click to expand...

Is the Second Panel :
(1) fed from a OCPD in the First Panel ?
(2) fed from a tap on the Lugs on the First Panel ?
(3) fed from a tap after the Main on the First Panel ?
May be we need a picture :)
 
The only panels where the grounding can be established by other than an equipment grounding conductor are (a) a service panel, (b) the first disconnect from a separately derived system. or (c) a panel being fed from another building (in Codes prior to '08). Any other panel would be grounded by an equipment ground listed in 250.118.
 
This is what I call a feed-through panel:

feedthrough.jpg


Two tubs, side-by-side, one panel with circuits 1-42, the other panel with circuits 2-84.
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mcclary's electrical said:
That's how it's done. But if the second panel is in another building, then you can use (3) wires prior to '08
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But with no other metallic paths. I would run 4 wires anyway regardless of code cycle. It just makes sense to me. I always wondered about a 3 wire feeder, even in metal conduit. I have been using 4 wires as long as I can remember.
 
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