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limey_swindon 01-07-2008 06:29 PM

Generator Safety Switch Help - Breaker Size?
What a great site, and want to thank everyone in advance for taking time to answer my question (s). I'm sure not a professional, as you will see in my question (s). Years ago, I built a home for myself, and now building one for my mother, who due to her health needs to be on a one floor plan. For the most part I've done all the work myself, by researching the net or reading books, I just can't find an answer to this question.

Installing a generator transfer switch, tied into a Square D QO box. I've used 12 gauge wire and 20 amp breakers to wire the whole house. The transfer switch reset buttons, singles show 15 amp on them, and the double show 20 amp. Would this require 15 amp and 20 amp breakers respectively to match the resets?

And if you don't mind one other quick question? Installing AC smoke/carbon monoxide alarms with battery backup, to be interconected. I know you CAN use 14-3, but can I use 12/3, seeing I already have some left over?

Again thanks in advance for any advice given. Regards.....Limey

goose134 01-07-2008 07:25 PM

Need more info for the generator question. Maybe a link to manufacturer or a schematic? The smoke/CO interface may be wired with 12/3 or 14/3.

limey_swindon 01-07-2008 07:41 PM

Hi, it's a generac, gasoline, 7500 watt generator. The 4 prong extention cord will come off the generator and plug into the outlet box located on the outside of the house (pb30), which in turn will plug into the front of the generac 10 circuit safety switch, which in turn wires into the appropriate circuits in the main breaker box. the switch itself had 6, 15 amp circuits and 2, 20 amp double circuits (which can be seperated to make into 4 individual circuits). my question is, do the 15 amp circuits in the safety switch have to match up with 15 amp circuits in the main breaker box? all the wiring going into the main breaker box is 12 gauge or heavier. hope this helps you answer my question. regards...limey

J. V. 01-09-2008 11:40 AM

No, they don't have to match up. You will just have 15 amp protection on a 20 amp circuit. The wire can be larger than needed, but not smaller. How are the connections made in the main panel? Where the transfer switch wires connect to the building wires?

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