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Kenmore, WA
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Seattle, WA
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Double Backfed Pre-1984 Panel
[#2] Posted: 03/01/2011 - 12:20:26 PM |  |  |
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Mike...I found one reference to a "CH double split bus panel", which described it as a rare but good panel. Not the most authoritative site though (garden web).
http://ths.gardenweb.com//foru....html?11 (6th post from the top)
But it does indeed look like you might have a 12-12-12 arrangement there. If the house was vacant I would have been tempted to try the two mains and use a voltage sniffer on the lower breaker wires to see what turned off what. Of course I say that as an armchair quarterback, having had a while to think about it. In reality, I would probably be posting the same photos and kicking myself for not thinking to try that on-site. 
(Not a Guru on anything)
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Richard Moore
Rest Assured Inspection Services
Seattle, WA
http://www.rainspect.com
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Gaston, Oregon
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 Double Backfed Pre-1984 Panel
[#3] Posted: 03/01/2011 - 2:27:07 PM | | |
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I've seen a few before. They're just split bus panels with three sections, just as you've surmised.
The schematic might be on the inner left or right wall of the box, behind the wires.
- Jim Katen, Oregon
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Jim Katen, Oregon
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Kenmore, WA
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