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AC/DC supply vs. UL
Posted by Jerry Anderson on 9/26/2007, 8:41 pm
Hello Bert! Hey it's been awhile since I've written and I hope you've been well. I've got a new job installing high voltage high current sensors for utility companies using fiber optics to sense the magnetic field. Cool stuff. Anyways, What I'd like your advice on is I have a very crude ac/dc supply powering a string of led's. For instance, if the input is 120ac I have it going through a full wave rectifier and can power about 40 leds at about 28ma. My question is if I just use the rectifier and a 10-20uf cap to smooth out the dc, will it pass UL testing? I will have a UL rated 600v cable going into a small metal box with the hot going through a 500ma fuse. The box will be tied to earth ground and the hot and neutral will go to the input of the rectifier on a small circuit board and the unregulated output will of course go to my string of led's. Do I need to add a tank circuit or an emi filter? What about RFI? The led board will be mounted to a UHMW 1/4" mounting plate. Your help is of course greatly appreciated
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