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            DIY Message Boards  Hop To Forum Categories  Home Improvement  Hop To Forums  Electrical    Low voltage LED night lights - options to wire them?
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        Low voltage LED night lights - options to wire them? Sign In/Join 
        posted
        Is it reasonable to run low voltage throughout the house to power LED nightlights instead of running 120VAC to individual units, each with its own transformer? Why not just have one centralized ballast? Are there any code issues - especially in California?


        --Joe
         
        Posts: 1 | Location: United States | Registered: Mar 26, 2013Reply With QuoteReport This Post
        posted Hide Post
        it's called Ohm's Law. all wire has resistance. the resistance is pressure against the voltage on the line, and end to end in a house, the 100 feet will cause uneven LED brightness.

        LED lighting includes its own resistance to limit the current across the chip, and thus the brightness. the wire drop, assuming the usual serpentine wiring of homes which can double effective distance, will even cause a few of the LEDs to not light.

        with 120 volt devices, none of which are currently semiconductor and require current limiting, you don't see the 5-8 percent line drop as an issue.


        sig: if this is a new economy, how come they still want my old-fashioned money?
         
        Posts: 5483 | Location: North Burbs, MN | Registered: Mar 14, 2007Reply With QuoteReport This Post
        Picture of CommonwealthSparky
        posted Hide Post
        It depends on your set up. If all the runs are exposed then flexible cords and cables are allowed. But if any cable is placed in an concealed space [wall cavity] you run into trouble. {NEC 400.8} Then that run has to be cable approved to be run inside concealed areas. E.I. Romex, armored cable, etc.
        I agree with swschrad that voltage drop becomes a much bigger issue at say 24v than it is at 120v. Depending on what your lay out is this can be a problem.

        This message has been edited. Last edited by: CommonwealthSparky,


        Popeye only reached for the Spinach can as a last resort...
         
        Posts: 1393 | Location: Central Pennsylvania | Registered: Jun 02, 2010Reply With QuoteReport This Post
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