voltage drop in low voltage wiring
Total watts on low voltage wire * length of wire run in feet / wire size constant listed in chart below = VOLTAGE DROP. WATTS * WIRE RUN LENGTH / CONSTANT = VOLTAGE DROP. (note: the smaller the number the bigger the wire. 8/2 low voltage wire is the largest size) Example: 100 watts of lights at the end of a 200ft wire run on a 10/2 wire. 100 * 200 = 20,000 / 11,920 = 1.68 volts. So if you have 12 volts coming out of the transformer the voltage drop equation tells us the voltage will be reduced by 1.68 volts to 10.32 volts. 10.32 volts will produce a slightly yellowish light.