What is the correct interpretation regarding the use of a manually operable switch as a disconnecting means?

• A. A manually operable switch is permitted as a disconnecting means
• B. A manually operable switch is not permitted as a disconnecting means
• C. A manually operable switch is permitted only for outdoor installations
• D. A manually operable switch is permitted only for lighting circuits

Answer: (A)

A manually operable switch can serve as a disconnecting means as long as it can reliably isolate the circuit. The essential requirement is that the device provides a visible, easy-to-operate break in the circuit and is readily accessible to personnel. If the switch is rated for the circuit’s voltage and current and is installed in a location where it can be opened to de-energize the equipment, it fulfills the role of the disconnecting means.

This isn’t restricted to outdoor installations or exclusively to lighting circuits—the switch’s ability to disconnect is what matters, provided it’s properly rated and accessible. Remember that a disconnecting means is separate from the overcurrent protection upstream; you still need appropriate protection in the system, but the manually operable switch can be the means to isolate the circuit when needed.