A 3Ø safety switch that is rated at which voltages can be used as the disconnecting means for a 208-volt, 1Ø motor?

A three-phase safety switch rated at either 240 volts or 600 volts can effectively serve as the disconnecting means for a 208-volt, single-phase motor due to the appropriate voltage range and compatibility within the motor's operational specifications.

When evaluating the scenarios and voltage ratings, the 208-volt supply in a typical three-phase system can be derived from a wye configuration. A safety switch rated at 240 volts is acceptable because it slightly exceeds the 208-volt requirement, offering a suitable margin for operation. Similarly, a switch rated at 600 volts can also be used, as it is well above the required voltage and ensures that the device can handle the current without issues.

This allows for flexibility in choosing the appropriate safety switch that meets the motor's requirements without compromising on safety or performance. Therefore, both of these voltage options are valid, making the choice of utilizing either a 240-volt or a 600-volt safety switch an appropriate solution for disconnecting a 208-volt, single-phase motor.