Wiring Flood Lights

Discussion in 'Electrical Forum discussion & Blog' started by Richard'sRenu, Aug 5, 2007.

  1. Richard'sRenu

    Richard'sRenu New Member

    Messages:
    15
    I have a house-relatively large ~5000sq ft and want to control the outside floodlights from the front door- and both master bedrooms (one down and one up). I'm looking at the standard double 100w type floodlights. Electrical panel is on the first floor- and lights will be on the sofits.

    Is there a better way to wire- other than bring the power in at the second floor switch and save ~6ft of 12/3. It seems like a LOT of wire. Is it too long-is 10/3 and 10/2 required for such a run? Too much voltage drop. Or no big deal since it's just lights? Just the lights will be running on this circuit.

    Thanks in advance-

    [​IMG]
  2. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

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    2,734
    Location:
    Central Florida
    I think you save the 6' of 12-3 anyway; you only need 12-2 between the switch and the light. It looks like you might save a little 12-2 by running the light at the top of the picture from the first light, rather than putting it at the end of the chain. That would result in a smaller voltage drop as well at that 3rd light, but I doubt you'd notice (the difference is about .3 volt). As drawn, the voltage drop at the far light (assuming all lights are working and the far switch is controlling) is under 1 volt, well within the 3% guideline. Copper's cheap these days; I'd go with whatever's easiest to install.
    Last edited: Aug 6, 2007
  3. Richard'sRenu

    Richard'sRenu New Member

    Messages:
    15
    Thanks Mikey- I'll walk off the distance to see which is shortest. And yes- the wire is a lot cheaper since last year- about $75 less for a 500ft spool!!

    Richard
  4. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

    Messages:
    2,734
    Location:
    Central Florida
    Darn good thing, too. It's amazing how fast a 500' spool disappears. Good luck.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    22,262
    Location:
    New England
    A couple other possibilities: motion controlled lights. they go on only when they detect something, but you can force them on (typically by flicking the switch). Or, look into Insteon or X-10 for remote control. One good source of all sorts of interesting stuff is www.smarthome.com.
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