CR4 - Thread: Whats the function of a changeover switch in an Evacuation Siren system?

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Walter Jacob Member Join Date: May 2012 Posts: 5	Whats the function of a changeover switch in an Evacuation Siren system? 05/23/2012 6:07 PM
	Whats the function of a changeover switch in an Evacuation Siren system?
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RAMConsult Guru Join Date: May 2007 Location: NYC metropolitan area. Posts: 821 Good Answers: 102	#1 Re: Whats the function of a changeover switch in an Evacuation Siren system? 05/23/2012 7:36 PM
	Probably to "changeover" from utility power to backup power, if it's an old Civil Defense siren it most likely has a universal motor that runs on both AC and DC. __________________ Curious minds want to know, engineering minds get answers....
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