From a light fixture wiring diagram, you learn the different elements of your wiring project based on the electrical symbols and where each wire goes. This ensures that you install the light fixture accurately, safely and according to electrical codes.
By studying the light fixture wiring diagram, you understand which connections you need to make and how to make these connections. You also learn the voltage of the circuit from the wiring diagram. For example, if the wiring diagram has L1 and N, it is a 110 Volts circuit. If it has L1 and L2, it is a 240V circuit. If it has L1, L2 and N, it is a 110-240V circuit.
The color codes of the wires on the wiring diagram help you to understand what each wire is for. Therefore, you do not have to use a voltage tester to test what each color means. White wires are neutral and they carry power to the service panel. Green wires are ground wires that carry power back to the service panel when the white wires fail. Black, blue, red and other colors are hot wires that carry power to the light fixture.
After installing the light fixture, you may also use the wiring diagram for testing and troubleshooting. By looking at the wiring diagram of an existing light fixture, you learn where the connections and splices are so that you can repair or replace a poor or defective connection or splice.