I understand from archived questions that the 600 Watt transformer has: capability for 300w x 2. Each has Terminal A, B and C. I also understand that Terminal C is the neutral so....here is my question.I have (1) 600 W transformer and (1) 300 Watt transformer. The 300 watt transformer powers: (4) uplights/50W each with no problem. Distance of home run roughly 76 feet. I added another 50w to the 300 trans. and the lights dimmed somewhat. I use 12/2 cable. My connections on the back of the 300 unit are: one wire under terminal A, one under B, nothin g under CThe same applies to the 600 watt transformer. I think I am not using the transformer correctly, or am I? I pruchased the 600 w transformer for 6 additional up lights, total distance is about 350 feet (I have just under an acre) Am I going about this correctly and is there a diagram you might refer me to? Thanks so much....

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You might want to run another cable and split up the lights into two home runs back to the transformer.  Check out our CALCULATING VOLTAGE DROP PAGE for wiring ideas.

Now for the new installation that is 350 feet, you have a problem.  I hope you purchased HEAVY DUTY LANDSCAPE CABLE such as 10/2 or even 8/2  and a HIGH VOLTAGE TRANSFORMER! 

This kind of installation will take some careful planning otherwise you will be disappointed with the results.  I would recommend that you hook up the lights, look at them at night before you bury and wires.  That way you can make adjustments as needed.

Thanks for shopping at Residential landscape lighting & Design.  We appreciate the business and look forward to assisting you in the future.

http://www.residential-landscape-lighting-design.com

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