12 Volt Kitchen Cabinet Lighting Wire Gauge? Help! :/ - Electrical - Page 2 - DIY Chatroom Home Improvement Forum
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Old 09-24-2009, 10:32 AM   #16
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Originally Posted by Lupinglade View Post
What kind of fuse would you suggest? Does the transformer not provide this sort of protection normally?
Post a link to your candidate 'former.
Some may have an internal fuse or breaker, some may be short circuit proof, like a bell 'former.

I guess I'd use #14 or #12 and arrange the wiring such that the current in each wire stays under 15A or 20A or so, and the voltage supplied to adjacent lamps is close enough to being equal that most people cannot see a difference in brightness.

Romex is good to 600v but if you can find a wire whose insulation is good for 25vac or so and is approved for this use, etc., etc., that should be good enough.

If your lamp life is unsatisfactory you
could use a $3 voltage dropping resistor or inductor upstream or downstream of the 'former and probably be NEC-non-compliant
or else find some kind of dimmer that will work at 12vac or else can be used upstream of a 'former.
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Old 09-25-2009, 11:55 AM   #17
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We have 18 x 20watt xenon puck lights across the top cabinets of the kitchen
So one run will be 15 feet and power 11 lights. The other will be almost 30 feet and power 7 lights.
If you use #10 AWG the voltage at the last bulb of the first string will be 11.89v, and at the second string, 11.95v.
These brightness differences will probably not be noticeable. The current at the beginning of the first string is 11.7A and 18.3A for the second.

My spreadsheet is still set up to solve this type of problem for more or less equally spaced lights so if you have other configs you'd like to try I can tell you what to expect.

I guess a 5% voltage drop from one end of the string to the other will not be noticeable.

On a current draw basis alone you could use one long piece of #10, 2 ea. pieces of #12 or 3 ea. pieces of #14, depending on how many lights are in each string.

Last edited by Yoyizit; 09-25-2009 at 03:56 PM.
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