Square D panel (no bus bar)

**Trent Tarter** · 05-19-2010, 08:39 PM

This is a square D panel downstream of main service equipment. I think I may have seen these before but it's been a long time. The panel has no bus bars or main terminals. Breakers have terminals at both sides of the breaker. One side if for power entering and one side for power leaving. Is there a specific name for these types of breakers/panels.

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**Tom Rees** · 05-23-2010, 04:13 PM

I'm really curious how this panel works etc. Any one have any clue.

James Duffin · 05-23-2010, 04:43 PM

I would call it a feed-through breaker but they normally don't mount that way.

**Rollie Meyers** · 05-23-2010, 05:26 PM

Looks like SQ D QOU frame breakers, lug in, lug out.

Edit: It does not look like a OEM install more like "Field Engineering".

**Trent Tarter** · 05-23-2010, 07:34 PM

"Feed-through breakers" that's a good description. The breakers appear to be installed in factory brackets that are screwed to the panel cover. Neutrals and grounds are separated and bundled with wire nuts. This place was built in 1974, one of the most unique and difficult homes I have ever inspected.

Does anyone know if Square D still makes this type of breaker and would it be allowed to be used today? I really don't understand the purpose of this type of set up. I'm recommending further review by an electrician.

James Duffin · 05-23-2010, 07:42 PM

It looks like the panel still has the label in-place. Check it to see if that panel is approved for that type breaker. The model of the breaker should be on the breaker somewhere.

**Rollie Meyers** · 05-23-2010, 09:17 PM

SQ D QOU breakers are still avail, now they even mount on DIN rail too.

Paul Johnston · 05-24-2010, 03:42 AM

Originally Posted by Trent Tarter

This is a square D panel downstream of main service equipment. I think I may have seen these before but it's been a long time. The panel has no bus bars or main terminals. Breakers have terminals at both sides of the breaker. One side if for power entering and one side for power leaving. Is there a specific name for these types of breakers/panels.

It looks like it is mounted to the front cover.

Lou Romano · 05-24-2010, 06:28 AM

I have never seen this type panel in a residential application but it is fairly common in marine applications. This type breaker mounted to the cover, is used in shore power pedestals and in yacht panels. I have seen feed through breakers mounted in enclosures for commercial and residential applications but they were mounted on a rail or backboard.