What types of devices can be used as disconnecting means according to the NEC?

What types of devices can be used as disconnecting means according to the NEC?

• A. Only circuit breakers
• B. Molded case switches, circuit breakers and general-use switches
• C. Only power-operated switches
• D. Only snap switches

Answer: (B)

The answer is supported by the requirements set forth in the National Electrical Code (NEC) regarding disconnecting means. According to NEC, disconnecting means must be able to safely isolate a circuit or equipment from the power source for maintenance or emergency purposes. Molded case switches, circuit breakers, and general-use switches are all classified as acceptable devices that can serve this purpose. Each of these devices is capable of interrupting the flow of electricity and providing a safe means to disconnect electric equipment from its supply, depending on the application. Molded case switches are designed to break the current under both normal and short-circuit conditions, while circuit breakers provide similar functionality with the added advantage of automatic tripping during overloads. General-use switches, which may be manually operated, are also included to provide disconnect capability in various installations. Utilizing any of these devices ensures compliance with safety standards and the NEC, allowing for a versatile approach to disconnecting means across different electrical systems and installations.

The answer is supported by the requirements set forth in the National Electrical Code (NEC) regarding disconnecting means. According to NEC, disconnecting means must be able to safely isolate a circuit or equipment from the power source for maintenance or emergency purposes.

Molded case switches, circuit breakers, and general-use switches are all classified as acceptable devices that can serve this purpose. Each of these devices is capable of interrupting the flow of electricity and providing a safe means to disconnect electric equipment from its supply, depending on the application.

Molded case switches are designed to break the current under both normal and short-circuit conditions, while circuit breakers provide similar functionality with the added advantage of automatic tripping during overloads. General-use switches, which may be manually operated, are also included to provide disconnect capability in various installations.

Utilizing any of these devices ensures compliance with safety standards and the NEC, allowing for a versatile approach to disconnecting means across different electrical systems and installations.