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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7653
Experience:  Proven Professional 48 years Experience
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I am installing low voltage landscape lighting in my outdoor

Customer Question

I am installing low voltage landscape lighting in my outdoor planters. I will have a total of four runs: Run "A" will be about 40' with 8 lights equally spread out along the entire run; run "B" will be about 75' with 8 lights located in the last 15' of the run; and run "C" will be about 120' with 4 lights located in the last 20' of the run; run "D" will be about 50' with 8 lights spread equally along the entire run. All lights are rated as 10W.
Since there are 28 lights total, I purchased a 300W transformer. The transformer has 4 taps as follows: 12V; 13V; 14V; 15V. I was told that the 12V tap is for "short" runs up to 50', whereas the 15V tap is for long runs up to approximately 150'.
I was given information that for the "long" run, I should use 14-2 wire, but the shorter runs could use smaller wire such as 16-2.
I plan on connecting as follows: A to Tap 1; B to Tap 3; C to Tap 4; and D to Tap 2. For simplicity, I plan to use 14-2 for all runs.
QUESTION: If the "longer" runs require heavier gauge wire such as 14-2, will I cause any damage to the lights or have any electrical problems with the wire or transformer if I use the 14-2 for the "shorter" run also, instead of the "recommended" 16-2?
Thank you for your help!
Background Information:
Cable Requirements:
Submitted: 2 years ago.
Category: Electrical
Expert:  Mike G. replied 2 years ago.
Hi, I'm Mike and I'll be glad to assist you. Go ahead and use the 14/2. The larger wire reduces the voltage drop and will be fine.