Quick question, I'm laying 12 gauge in the ground right now. My longest run is probably close to 300 feet. Is that going to be to long? Plan on running that one on the highest voltage.
Hi Jace, Thanks for your question. Our general guideline uses #12/2 for up to 200 ft.; #10/2 for up to 300 ft.; runs over 300 ft. are not recommended. Of course, these recommendations are based on typical loads (lamp wattages). According to the formula: Distance (ft.) x Load (W) x 2 / Cable Constant = Voltage Loss. Cable constant for #12/2 is 7500. For your example: (with 10W load): 300 ft. x 10W x 2 / 7500 = 0.8V voltage loss (with 30W load): 300 x 30W x 2 /7500 = 2.4V voltage loss And so on ... These formulas are just estimates. Allow for additional 1 to 2 volts of voltage loss. Note the above calculations can be found in our transformer manual.
