1. (a) Doors or removable panels which could provide non-qualified persons access to high-voltage energized parts shall be locked or secured by other approved means. When high-voltage metal-enclosed switchgear or control assemblies are accessible only to qualified persons, bolted-on or hinged and bolted cover plates shall be permitted to be used.
2. (b) Low-voltage control equipment, relays, motors, and the like (except instrument or control transformers which are connected to the high voltage) shall not be installed in compartments with exposed high-voltage energized parts or high-voltage wiring unless the access door or cover is interlocked with the high-voltage switch or disconnecting means to prevent the door or cover from being opened or removed unless the switch or disconnecting means is in the open position.
3. (c) Switchboards with exposed live parts. Switchboards that have any exposed live parts shall be located in permanently dry locations and shall be accessible only to qualified persons.
4. (d) Panelboard enclosures. Panelboards shall be mounted in cabinets, cutout boxes, or enclosures designed for the purpose and shall be dead front. However, panelboards other than the dead front externally-operable type are permitted where accessible only to qualified persons.
5. (e) Knife switches mounted in switchboards or panelboards. Exposed blades of knife switches mounted in switchboards or panelboards shall be dead when open.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

History

1. Editorial correction filed 11-2-83 (Register 83, No. 45).

2. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

3. Amendment of subsection (b), new subsection (c) and amendment of Note filed 4-1-2009; operative 4-1-2009. Submitted to OAL for printing only pursuant to Labor Code section 142.3 (Register 2009, No. 14).