L1-L3 stands for what in electrical terminology?

• A. Lines 2-4
• B. Lines 1-3
• C. Ground lines
• D. Phases 1-3

Answer: (B)

L1-L3 designate the three line conductors in a three-phase electrical system, with L standing for Line. These are the three hot wires that carry the distinct phase voltages, separate from neutral and ground. So L1-L3 correspond to Lines 1 through 3—the three lines feeding a load. While they’re sometimes colloquially thought of as phases, the precise naming uses Line to identify the conductors, which is why this interpretation fits best. The other options describe ground concepts or nonstandard numbering, which don’t match the meaning of L1-L3.