If a tech measures the voltage to a 3-phase 240 VAC blower motor and gets readings of L1 to L2: 238V, L1 to L3: 240V, and L2 to L3: 241V, what does this indicate?

The measurement of the voltages between the phases of a 3-phase system provides valuable insights into the health and functionality of the electrical supply. In this specific scenario, the voltage readings between the three lines are very close to the expected nominal voltage of 240 VAC.

For a 3-phase system, it's normal for voltage measurements between phases to fluctuate slightly due to variations in load and supply, but these readings fall well within typical acceptable tolerances. The voltage between L1 to L2 is 238V, L1 to L3 is 240V, and L2 to L3 is 241V. All these values are sufficiently close to the nominal voltage, typically allowing for a tolerance of ±10% for 240 VAC systems. Since the readings do not exceed this allowable range, they indicate that the electrical supply to the blower motor is functioning properly and is providing suitable voltage levels.

Understanding the tolerances for voltage in a 3-phase system is crucial for maintaining equipment longevity and performance. Thus, these measurements indicate that the voltages are acceptable and indicate healthy electrical supply conditions.