landscape lighting wire design; T-Method

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Old 12-02-12, 12:03 PM
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landscape lighting wire design; T-Method

Hi folks. Sorry if these questions are pretty silly but I am doing this for the first time.

So I am doing a low voltage landscape lighting set up. Got 12 guage wire. 200 watt power pack. Very simple set up along two sides of a finished walkway (gravel/flag with an edger) in my backyard.


Left side:

4 deck lights (7w each); closest to the box. first is really within 5 feet but I read the 1st should be no closer than 10 ft, so can double back I guess if I need to respect that 10 foot rule per the instructions on box
1 walkway light (10w)
1 spot (35w) near a water feature
1 well light (35 w) to backlit a firepit seating area. Well light is furthest out. About 70 ft out from the box

Right side:


2 walkway lights (10w); first is 15 ft from box. second is 45
1 well light. furthest out; at firepit. right at 75-80 ft which I know is about the extent you can go w/o voltage drop on a 200W box. may have to go with 10 gauge wire to compensate?

Since its running on both sides of a walkway back to a firepit; I think the T style makes sense. my question is, the power pack can only take one wire in to the terminals....so I assume I run one wire in of course, out a couple feet and then branch off ("tee it"). I suppose I could even do the first 4 deck lights (total 28W) before the T? or do you want to T as soon as possible?

If I do get 10 gauge wire for that longer run, does it play nice with the 12 gauge off the other side of the T? and to the individual lights? or do I need to upgrade it all (both sides of the T)?

open to suggestions. thanks,

THB
 
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Old 12-02-12, 01:25 PM
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That's the beauty of low voltage wiring. You can do almost anything. You can T the wire wherever you need to. If you are running two legs to the transformer then you'll probably not have to increase your wire size. However, with # 10 wire you can be assured of no issues. You can connect #10 and #12 together. If connections are outside use gel filled wire nuts.
 
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