Adds requirements for substations and work in them. The employer provides and maintains enough access and working space around electric equipment for ready and safe operation and maintenance; installations that meet ANSI/IEEE C2-2012 comply, and others are judged by conformity with the C2 edition in force when installed, whether employees can keep the employer-established minimum approach distances while working on exposed energized parts, and whether work precautions give equivalent protection. Draw-out circuit breakers are removed or inserted only in the open position, with the control circuit made inoperable where the design allows. Conductive substation fences are grounded, and when a fence is expanded or a section removed, sections are isolated, grounded or bonded as needed against hazardous potential differences. Rooms and spaces holding electric supply lines or equipment must be guarded where exposed live parts at between 50 and 150 volts to ground sit within 8 feet (2.4 m) of the floor or working surface; where live parts at 151 to 600 volts within 2.4 m are guarded only by location; or where live parts above 600 volts are present, unless enclosed in grounded metal-enclosed equipment with openings designed to deflect inserted objects or mounted high enough to give protection equal to 2.4 m at 50 volts. Such spaces are enclosed by fences, screens, partitions or walls to minimize entry by unqualified persons, who may not enter while equipment is energized; entrances carry warning signs keeping unqualified persons out and are kept locked unless attended by someone preventing unqualified entry. Live parts above 150 volts to ground without insulating covering must be guarded unless their location gives enough clearance to minimize accidental contact (ANSI/IEEE C2-2002 clearances comply, with similar criteria for other installations). Guarding within compartments is maintained during operation and maintenance, apart from fuse changes and other access qualified persons need, to prevent contact and dropped tools. Before guards come off energized equipment, barriers go up around the work area to keep others in the area from the exposed parts. On entering an attended substation, employees other than those regularly working there check in with whoever is in charge of substation activities to learn of special system conditions affecting safety. The 1926.952 job briefing must cover those conditions, including where energized equipment sits in or beside the work area and where any deenergized area ends.
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