A 3-pole, 250-volt safety switch can be used as the disconnecting means for which motor circuit?

A 3-pole, 250-volt safety switch can be used as the disconnecting means for which motor circuit?

• A. A 2-wire, 120-volt, 1-phase
• B. A 2-wire, 208-volt, 1-phase
• C. A 3-wire, 208-volt, 3-phase
• D. A 3-wire, 240-volt, 3-phase

Answer: (D)

A 3-pole, 250-volt safety switch is designed to handle the disconnection of 3-phase circuits, which makes it suitable for 3-wire, 240-volt, 3-phase systems. The 3-pole design allows for disconnection of all three phases of the power supply simultaneously, ensuring safety and compliance with electrical codes when servicing or maintaining the equipment. In a 3-wire, 240-volt, 3-phase setup, this switch can efficiently disconnect the motor from all three phases, providing a reliable means to ensure that the circuit can be safely maintained. The voltage rating of the safety switch, which is up to 250 volts, is also adequate for this application, as it matches the 240-volt circuit without exceeding it, which is crucial for the protectiveness of the switch. Other options presented, such as the 2-wire configurations and the 3-wire, 208-volt application, do not align with the requirements for using a 3-pole switch effectively. The 2-wire arrangements only require a single-pole switch, whereas a 3-pole switch would be unnecessary and inefficient. The 3-wire, 208-volt scenario also does not meet the voltage specification of

A 3-pole, 250-volt safety switch is designed to handle the disconnection of 3-phase circuits, which makes it suitable for 3-wire, 240-volt, 3-phase systems. The 3-pole design allows for disconnection of all three phases of the power supply simultaneously, ensuring safety and compliance with electrical codes when servicing or maintaining the equipment.

In a 3-wire, 240-volt, 3-phase setup, this switch can efficiently disconnect the motor from all three phases, providing a reliable means to ensure that the circuit can be safely maintained. The voltage rating of the safety switch, which is up to 250 volts, is also adequate for this application, as it matches the 240-volt circuit without exceeding it, which is crucial for the protectiveness of the switch.

Other options presented, such as the 2-wire configurations and the 3-wire, 208-volt application, do not align with the requirements for using a 3-pole switch effectively. The 2-wire arrangements only require a single-pole switch, whereas a 3-pole switch would be unnecessary and inefficient. The 3-wire, 208-volt scenario also does not meet the voltage specification of