Home Improvement Asked by Jo Roman on April 25, 2021
I have purchased a transfer switch,the Reliance Controls Corporation 31406CRK 30 Amp 6-circuit. The panel in question is a ITE Pushmatic, like the one in the picture except it has two main breakers on top of each rail. I plan on using this on six 115 VAC 15 amp circuits; if I have to I guess I could rewire the circuits I need to one side of the panel but just wondering if there is any technical issue with running the transfer wiring to both sides of the panel. I am no electrician but I do have some understanding of the work involved, and I don’t think there are any pitfalls; however I know my limitations and rather ask smarter folks than me. Thanks
Interesting panel. Ours is very similar but with a BR-style 4-throw 200A breaker above the two 7-row buses. Ours went in in the 1980s, but prior to that the cost of those huge 200A breakers was prohibitive.
It appears your panel has the same 7-row buses, but it simply uses a larger value (e.g. 60A) Pushmatic breaker in the top position, back-fed... giving 1 main breaker per bus.
Having 2 main breakers was legal under the old "Rule of Six".
In point of fact, it's still legal under the rules for 320/400A service; those are simply connected to dual 200A main panels. Think of yours as "That, inside one chassis" (which is also done on many 400A meter-mains).
Much as I loathe those 6-8-10 circuit transfer switches, my top reason is the absurd price. $350-450-550 for something that simple is just insane, especially given how limited they are. But I have to admit when you're dealing with an "obsolete" panel like this, that's kinda the use-case for these things.
That said, I really wish I could get a closer look at this panel's innards. Both for academic curiosity, and because I suspect the internal arrangement is ... highly exploitable. I think an external transfer switch could be wired to throw over one of the two internal buses to generator, giving you 12++ loadable circuits instead of 6. It would be contingent on AHJ approval, but it seems doable.
The way I'd do it would be to have a second main panel right next to it, of modern stock, probably a Siemens 30-space main-lug with their $25 ECSBPK01 interlock in it. I would double-feed the panel off the meter (exactly as done with 400A service).
Another plan would be to install the new panel as the one main panel (think $120 for the panel + $70 for a gen interlock for that panel)... and then, feed the Pushmatic panel as a subpanel of this panel. That would place every breaker space in the entire house under the generator interlock, meaning absolutely no branch circuit rewiring is necessary; just the service wires from meter to new-main, and the feeder wires from new-main to Pushmatic.
In fact, this could be an outside panel, which would satisfy NEC 2020 requirements for outside interlocks... or even a meter-main, which would require almost no wires run at all.
Well, you'd have to run the cable to the generator inlet in any case.
Answered by Harper - Reinstate Monica on April 25, 2021
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