Across L1 to L2 in the schematic would be:

Across L1 to L2 in the schematic would be:

• A. 120 V
• B. 240 V
• C. 480 V
• D. 600 V

Answer: (B)

In a three‑phase setup, the voltage you read between two lines (L1 and L2) is the line‑to‑line voltage. If the equipment or schematic shows a delta connection, each winding is connected directly between two lines, so the line‑to‑line voltage equals the winding voltage. Therefore, for a 240 V delta system, the voltage from L1 to L2 is 240 V. This is different from a wye (Y) connection, where the line‑to‑line voltage is √3 times the line‑to‑neutral voltage. For example, with 120 V line‑to‑neutral in a 120/208 V system, the line‑to‑line voltage would be about 208 V, not 240. So the 240 V reading between L1 and L2 indicates a delta configuration rated at 240 V.

In a three‑phase setup, the voltage you read between two lines (L1 and L2) is the line‑to‑line voltage. If the equipment or schematic shows a delta connection, each winding is connected directly between two lines, so the line‑to‑line voltage equals the winding voltage. Therefore, for a 240 V delta system, the voltage from L1 to L2 is 240 V.

This is different from a wye (Y) connection, where the line‑to‑line voltage is √3 times the line‑to‑neutral voltage. For example, with 120 V line‑to‑neutral in a 120/208 V system, the line‑to‑line voltage would be about 208 V, not 240. So the 240 V reading between L1 and L2 indicates a delta configuration rated at 240 V.