What is indicated by L1, L2, and L3 in electrical systems?

In electrical systems, L1, L2, and L3 represent the three phases of a three-phase power supply.

Each phase carries an alternating current of the same frequency but is shifted by 120 degrees from the others. This phase difference ensures continuous and balanced power delivery.

Meaning of each term:

• L1 (Line 1): First phase
• L2 (Line 2): Second phase
• L3 (Line 3): Third phase

Key characteristics:

• All three lines carry current
• Voltage between any two phases is constant
• Used for efficient transmission and distribution of electricity

Where they are used:

• Industrial machinery
• Large commercial buildings
• Power distribution networks

Additional point:
In some systems, a neutral wire (N) is also present along with L1, L2, and L3 to complete the circuit and provide phase-to-neutral voltage.

In simple terms:
L1, L2, and L3 are the three different electrical phases used together to supply stable and efficient power in large-scale systems.