Question about ABB S272-k16 2-pole Miniature Circuit Breaker

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Backfeed Miniature Breakers with Solar?

I am installing photovoltaic systems. However, there are some households with cramped panelboards. I need to know if it is possible to backfeed power with miniature circuit breakers.

If so, which breakers can I use? Any double pole that doesn't specify line or load?

Some help would be great.

Thank you,

GC

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I'm not up to date on PV systems so i will answer what i can about your question. The NEC applies to these installations so i hope you are familiar.

If the dc-ac inverter puts out 2 phase power then yes any two pole breaker rated for the amperage you are putting out would be fine. If the inverter puts out 120 then any single pole breaker will work.

That i know of, there are no 2 pole miniature or two handle breakers. There are breakers with two handles on them but they are tied to the same phase. the only thing i can think you may do would be to put a two handle single pole breaker in place of a regular breaker and then the one below it also. Then hook one leg off your inverter to one of the handles on the top breaker and the other leg to the bottom breaker.

Breakers do not have a line and load per say. The screw where wires are hoooked to is the load side of the automatic trip in the breaker however. The line would be where the breaker hooks to the bus bar but you can't really hook to that anyhow.

I would ensure what you do is up to code. There are safety issues involved. i assume you know your job though so i will leave it at that :) Hope this helped, write back if you feel i misunderstood.

Posted on Apr 05, 2009

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