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Re: I need to strap two single pole breakers together to...
This is a double pole circuit breaker that is used for a 240 volt device the bar in the middle is to shut down at the same time you can take it to a hardware store to replace it but the bar is factory made siemens is one common breaker or there might be a substute they can give you also
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In a traditional North American residential electrical panel (120/240 volt, single phase), installing a single width or single pole circuit breaker, you would expect to read 120 volts from the breaker terminal screw to either ground or neutral. A double width or double pole breaker would provide 120 volts from either of the breaker terminal screws to ground or neutral AND it will provide 240 volts BETWEEN the TWO breaker terminals.
A single-width circuit breaker case that contains two handles is NOT a two pole circuit breaker (these are called "tandem" or "1/2 size" breakers). This is because a single width breaker engages only one "line" in the panel. A double width breaker will engage 2 "lines" as a triple width breaker would engage 3 "lines" of a 3 phase panel. A single wide breaker can not physically engage more than 1 "line" so it will never be able to pass 240 volts.
You must install a double width / double pole breaker to safely supply a 240 volt circuit / device.
The reason for using the quad, is so that if any one of them trips, they all trip. GE used to sell lever covers that would join the levers together. I don't know if they still do. And I don't know if the Bryant breaker is JUST 4 single poles with their levers connected together.
A 2 pole circuit breaker is for 240 volt appliances such as ranges, dryers, water heaters, large air conditioners, and some motors. The breaker is designed so that _all_ conductors are de-energized when one turns OFF the breaker, or it trips due to overload or short circuit. If one used two individual breakers to supply a 240 volt load (which is not permited by National Electric Code), one could turn OFF just one breaker and render the equipment nonfunctional, yet the other breaker would still be supplying 120 volts to the equipment. Anyone working on that equipment, thinking that the equipment is turned OFF because it's not functioning could be killed by that energized 120 volt line under the right conditions. That's why it's important to always check for voltage on equipment that has been "turned OFF".
Most two-pole breakers have a small plastic bar that connects the two switches allowing them to be synchronized and used as a single breaker. However there are some two pole breakers that are intended to be used as two separate breaker and lack the need for the bar that synchronizes them, this is because they are not being used to power a single circuit or item, but separate circuits, or items. so no the breaker is not bad, and yes can be used to power single circuits or items.
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.
You need to put in what we call a sub box. This should be done by a licensed electrician, but if you really want to do it yourself you will need a distribution box some wire and it has to be connected directly to your main lags from the meter box, this box will have a main breaker built into it and spaces for additional breakers, depending on your existing wiring the electrician might chose to wire the additional box directly to your meter base and not your existing box. Either way you really should seek local professional help on this project, just for your safety and to satisfy your home-owners insurance.