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#42894 09/30/04 09:58 AM
Joined: Apr 2001
Posts: 449
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Sparkync, ITE makes a 30 circuit 100A MB panel, Square D makes a 32 circuit 100A MB panel. I have seen 42 circuit MLO panels with a 100A breaker installed with a retainer and used for a main. This is not a violation of NEC. Lighting and appliance panels are limited to 42 circuits by NEC. That's the only limit I am aware of.

#42895 09/30/04 04:26 PM
Joined: Nov 2002
Posts: 456
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An older FPE panel I have around suggests that DP breakers installed at the ends, SP breakers in the middle.

#42896 09/30/04 04:35 PM
Joined: Feb 2004
Posts: 494
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hi,
i have found that heavy consumers should be installed ahead of lighting loads on a bus. this will reduce the dimming effect on certain circuits when a dryer or oven kicks on..

this is not a big problem but i think it makes sense..


-regards

mustang

#42897 09/30/04 06:23 PM
Joined: Jan 2002
Posts: 1,457
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Sparky NYC, I just installed a Murray 30/40 circuit 100 amp main breaker panel. As for breaker layout I don't really think it matters.

#42898 09/30/04 07:43 PM
Joined: Jan 2003
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Sparkync, CH makes a 30 circuit 100A MB panel, Sq D also makes a 32 circuit 100A MB panel. We have been using the CH 30 for all our 100 amp upgrade.

#42899 09/30/04 10:40 PM
Joined: Oct 2002
Posts: 830
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Thanks for the replies on my 100 amp question. I figured I might be missing something. I'll have to ask my supply house why they don't stock anything bigger than a 20 circuit 100 amp. panel. Thanks again... Steve [Linked Image]

#42900 10/05/04 03:26 AM
Joined: Jul 2003
Posts: 394
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The panel is a in a stand-alone shop, no metallic connection to the associated house. 3 Wire arial feed. 100 amp breaker on the feed, 200 amp main included with the panel used as the disconnect. Overall system limited to 100 amp by the feeder breaker. Inspector never asked but I had load calcs and 100 amp was fine for the occupancy/usage.
It was actually a bit overengineered to minimize the effects of frequent motor starting loads. Once I crossed the breaker on the feeder, I could add almost any number of circuits as long as the total running load was low enough.

#42901 10/10/04 08:54 AM
Joined: Aug 2004
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I always figured the big breakers at the top thing started because of the old style split bus panels. You always put the big guys up top because the bottom set of breakers was only fed from a 2 pole 50 at the top.


Power to the people
#42902 10/10/04 12:58 PM
Joined: May 2003
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Funny you should say that, many resi panels have the rejection tabs for the first few breakers at the top, only allowing twins at the lower ones. Maybe a throw back to those type designs?


Mark Heller
"Well - I oughta....." -Jackie Gleason
#42903 10/10/04 05:12 PM
Joined: Aug 2001
Posts: 7,520
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Quote
I always figured the big breakers at the top thing started because of the old style split bus panels. You always put the big guys up top because the bottom set of breakers was only fed from a 2 pole 50 at the top.
Do we have any pictures or other details about these panels anywhere on ECN?

Here in the U.K. it's been common practice for years to start with the largest breaker next to the main and then work down through the ratings, ending with the 5 or 6A lighting breakers at the far end. There's nothing to say it has to be done that way, but it's a very widely adopted convention.

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