Calculate Voltage Drop
Resistance from Wire and Load Cause Voltage Drop Along WireThe higher the current draw through a wire, the greater the voltage drop. Larger wire size (diameter), measured as “American wire gauge” (AWG) the lower the voltage drop. Larger wire size offers less resistance to current for the load (watts) on the circuit. It is important to size wires according to voltage and load to minimize and control voltage drop. The path of least resistance is larger wire size.
Voltage Drop and Wiring SizeVoltage drop is not the issue it used to be using incandescent and halogen.
LED light source uses 5 to 7 times less power on the wire, that equates to 5 to 7 times less voltage drop.
Voltage drop is still a concern for optimum results when using more than a few lights, and you reach over 50 watts.
The wire size used can affect system performance.