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Old 03-26-2012, 10:25 AM   #1
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Square D 100 amp panel


Hi Forum,

I have a 100 amp service with a Square D panel and load center. The label on the interior panel states: QON 16M E series. 2 questions:

First, can anyone tell me if this load center accepts tandem breakers?

Second, I've attached an image. I assume this gap between breakers is here for a reason. Can anyone tell me why?

Some background: Home is 850 sq ft, 1 bedroom. Hot water is oil fired. I wanted to know that, if I absolutely had to, I could add a circuit to the electric panel for electric hot water. The panel is full with the following circuits:

30 amp-dryer, 40 amp-oven, 2 15 amps-furnace & hot water, 20 amp-washer, 6 15 amps for lights & recepticles.

If I can't use tandem breakers, would a small sub-panel be the way to go, or would the addition of a circuit for hot water be too much for this 100 amp service?

Thanks,
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Old 03-26-2012, 12:00 PM   #2
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Square D 100 amp panel


The paperwork on the panel should say for sure, but a QO panel with a single number designation (16) will not accept tandems. There doesn't appear to be a reason to have the two spaces vacant, but it's hard to tell from the picture. It may be possible to move two of the 120V breakers to these spaces (two from the same side of the panel) to open up space for a double pole breaker. For a house that small, check into a water heater that will work on a 20A 240V circuit.

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Old 03-26-2012, 12:13 PM   #3
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Hopefully this is a better image to reveal the space between breakers.
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Old 03-26-2012, 12:23 PM   #4
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What about the cover? Is there break-out tabs that correspond to the two open positions?
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Old 03-26-2012, 12:30 PM   #5
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The breakout tabs are still there, see image.
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Old 03-26-2012, 12:37 PM   #6
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You should be able to use those spaces. Move two circuits up as I outlined and you will have space for a double pole (240V) breaker to power the water heater.
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Old 03-26-2012, 12:52 PM   #7
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I here what your saying. To me, it almost looks like there's nothing there for the breaker to snap or lock onto......
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Old 03-26-2012, 04:00 PM   #8
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Those spaces are usable breaker spaces. There also are SQ D QO tandems that will fit that panel.
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Old 03-27-2012, 06:54 AM   #9
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Thank you all for your input.....
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Old 11-06-2013, 09:37 PM   #10
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Hi, I have a very similar panel with a similar question, but my i don't have that gap space and I am just looking to squeeze in 2 more 120V breakers.
My question is what are those 2 boxes in the top right position of the breakers (right across from the 100A main)? Can they be removed and replaced with breakers, or are the a part of the 100A main?

If they cannot be removed, can I avoid upgrading the whole thing and somehow installing a subpanel?
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Old 11-07-2013, 07:14 AM   #11
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Square D 100 amp panel


That is not an available breaker location. Tandems ARE available for QO load centers.
http://www.google.com/url?sa=t&rct=j...uzCnmV-WU933WQ

Last edited by brric; 11-07-2013 at 07:31 AM.
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Old 11-07-2013, 07:54 AM   #12
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Square D 100 amp panel


You should be careful about which breaker type you purchase for your QO panel.

Where the breaker mounts, there should be a slot in it to allow for the "hook" on a tandem breaker.

Older panels do not have the slot and aren't listed for adding new circuits. The breakers for these type panels are listed"for replacement only" and run about $35 each.

Here's a picture of each type.
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Old 11-07-2013, 08:16 AM   #13
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thanks guys, unfortunatly i already have all tandems, but it only adds up to 6 tamdems (12 breakers) and a 30A that goes to a sub on the other side of the house.
Picture should explain it better.

I assume the 30A is a 2 pole? It has 2 hot legs on it. Are these available in 1" size? (Haven't had a chance to browse the local electric store yet that stocks Square D breakers).

If the above is not an option, I guess I am left with pulling out a tandem, replacing with a 30A single pole to a subpanel, and putting 2 20A tamdems in it.

The reason for all this is that the missus's 1875W blow drier trips the bathroom 15A circuit after a few minutes, and much faster if any of the other receptacles are being used on that circuit. So Ill I want to do is run a dedicated 20A circuit to the bathroom.

All in all, 100A is way more than what I need with a gas boiler, heater, and drier.

Thanks!
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Last edited by nilsonov; 11-07-2013 at 08:20 AM.
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Old 11-07-2013, 08:34 AM   #14
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You could get a quad breaker for it.
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Old 11-07-2013, 09:12 AM   #15
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Nice, looks like exactly what I need. Thanks!

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