This section requires that where a disconnecting means is required by NFPA 70 in the Code, the lockable disconnecting means has to be capable of being locked in the open position. In addition, the locking means must remain in place even when the lock is not installed.
Example sections where a disconnecting means is required to be lockable, include but are not limited to the following:
225.25 Location of Outdoor Lamps
235.352 Disconnecting Means.
410.141 Control
422.31 Disconnection of Permanently Connected Appliances
426.51 Controllers
430.102 Location
430.113 Energy from More Than One Source
450.14 Disconnecting Means
495.44 Fused Interrupter Switches
495.46 Circuit Breaker Locking
514.13 Provisions for Maintenance and Service of Dispensing Equipment
600.6 Disconnects
647.8 Lighting Equipment
626.22 Wiring Methods and Materials
626.24 Electrified Truck Parking Space Supply Equipment Connection Means
626.31 Disconnecting Means and Receptacles
690.15 Disconnecting Means for Isolating Photovoltaic Equipment