LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Interesting and cool. I taught and learned in the same thread. ![Thumbs up (y) (y)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Sho did learn meInteresting and cool. I taught and learned in the same thread.![]()
110.3 (C) is all I've got.I don't see anything there prohibiting the use of a 3 bus panel for 120/240V plus neutral, seems like an elegant solution.
Cheers, Wayne
What would have been a compliant installation?I've actually done it. Didn't work out to good. Got turned down, but with a smile. He said nice try looks good, but nope.
All I'm saying is I don't think it has been UL approved to have the grounded conductor terminated on the lug designed for a hot wire,What would have been a compliant installation?
Bad call by the inspector.110.3 (C) is all I've got.
I've actually done it. Didn't work out to good. Got turned down, but with a smile. He said nice try looks good, but nope.
OK , well there you go. Hope the OP is reading that. BTW Wayne, Have you used this option? Just wondering...Bad call by the inspector.
In an ungrounded system, all circuit conductors will be disconnected by an OCPD, so they will all go to the busbars in a panel. In a grounded system, we usually take advantage of no longer needing to interrupt the grounded circuit conductor, so we use a terminal bar instead of a busbar. But nothing says we have to do that. The listing on a panel may impose a maximum voltage between the busbar and ground, but it certainly doesn't impose a minimum voltage.
240.22(1) tells us we can install OCPD on the grounded conductor when all circuit conductors are simultaneously opened by a common trip OCPD. To me, that says using a busbar for the grounded circuit conductor is allowed.
Cheers, Wayne
In addition, 404.2(B) Exception says:240.22(1) tells us we can install OCPD on the grounded conductor when all circuit conductors are simultaneously opened by a common trip OCPD. To me, that says using a busbar for the grounded circuit conductor is allowed.
I would/could use them on a three phase grounded delta system and be perfectly legal. There is no difference other than the application to single phase, however, I would not surprise my AHJ. They may be wrong in their interpretation but way cheaper to have the discussion before the installation.I don't recall ever seeing a panel instruction prohibiting grounded conductors on line terminals.
As long as it's as large as the other feeder conductor(s), it should be fine.
Can you use a single phase panel (I should say two bus bar panel) on a three phase grounded delta, with the grounded conductor on the "neutral" bar? If not, why not?I would/could use them on a three phase grounded delta system and be perfectly legal.
I didn't track down the actual Eaton catalog, but this webpage (near the bottom) says that the CH 3 phase panels are "Three-Phase Four-Wire--208Y/120 Vac or 240 Vac Insulated/Bondable Split Neutral". Not 100% sure what the last part means, but pretty sure it means that 240V between busbars is OK, you're not limited to 208V.The standard plug on CH 3 phase panel I have on my shelf is 208Y/120 VAC. Can't use that one.
I think it refers to two neutral bars, joined by a removable link, and bonding it/them is optional.". . . Insulated/Bondable Split Neutral". Not 100% sure what the last part means . . .
Now that I look at it again, the single phase panels are labeled "Single-Phase Three-Wire--120/240 Vac--Insulated/Bondable Single Neutral".I think it refers to two neutral bars, joined by a removable link, and bonding it/them is optional.