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Old 03-05-2011, 04:35 PM   #1
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Out door Light wiring

I have four driveway light on a 12/2 underground circuit (15a). I'm thinking about adding two more. The total distance from the breaker box would be about 200'. Each light uses a 60w bulb. Is the distance an issue? Other suggestions? Thanks.


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Old 03-05-2011, 05:15 PM   #2
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I have other suggestions. Change out your incandescent or cfl bulbs for LED lights. You could pull that proposed 360w -6 x 60 = 360w- down to 78w -6 x 13 = 78w- and still use the same wiring, whatever fixtures make you light in the loafers and get more lumens to light up your life at the same time. There many LED "stores" on the internet, but one that I have just recently delt with seems to have more of the daylight white and cool white bulbs with CRI's above 75 that are very promising for outdoor use. Try EagleLight.com in your browser.


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Mark Harvey (03-05-2011)
Old 03-05-2011, 06:04 PM   #3
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Here are resistivities for copper wire:

14AWG--2.575 ohms/M'
12AWG--1.619 ohms/M'
10AWG--1.018 ohms/M'
(be careful, M' means 1000 feet, not meters)

With 200' of 12AWG wire you have 0.323ohm outbound and 0.323ohm inbound. The more current you draw, the more voltage (and power) loss you will see due to the long wire V=IR. A 100 watt, 120 volt lamp has a resistance of 144 Ω when lit. If you had a 100 watt bulb at the end of a 200' 12AWG wire, the bulb would only see 119.5v instead of 120v. If you are using 15watt CFLs, you should be ok with six of them...?
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