Capacitors: before work, the employer disconnects capacitors from energized sources and short circuits them, with the employee applying the short waiting at least 5 minutes after disconnection. Before handling units in series-parallel banks, each unit is short circuited between all terminals and the case or rack, and cases on ungrounded substation racks have their racks bonded to ground. Any line connected to capacitors is short circuited before being treated as deenergized (deenergizing and grounding otherwise follow 1926.961 and 1926.962). Current transformers: employees may not open an energized current transformer secondary; if the primary cannot be deenergized before work on an instrument, relay or other part of the secondary circuit, the circuit is bridged to prevent an open-circuit condition. Series streetlighting with open-circuit voltage above 600 volts is worked under whichever of 1926.964 or 1926.965 fits, and before a series loop is opened the streetlighting transformer is deenergized and isolated from supply, or the loop is bridged. The employer provides enough illumination for safe work (1926.56 sets levels). Where an employee may be pulled, pushed or fall into water with a drowning danger, a 1926.106-compliant personal flotation device is provided and used, kept in safe condition and inspected often enough to catch rot, mildew, water saturation or other defects; streams and other water are crossed only where a safe passage such as a bridge exists. Excavations follow Subpart P. In public work areas, traffic-control signs and devices meet 1926.200(g)(2); before work begins where passing vehicles or pedestrians could endanger employees, warning signs or flags and other devices are placed conspicuously to alert and channel traffic; barricades are used where further protection is needed and around excavated areas; and warning lights are displayed prominently at night. Where voltage backfeed from cogeneration or the secondary system is possible, 1926.960 applies to energized work and 1926.961 and 1926.962 to deenergized work. Lasers are installed, adjusted and operated per 1926.54. Hydraulic fluid in insulated equipment sections must insulate for the voltage. Employees must never look into an open waveguide or an antenna fed by an energized microwave source; accessible areas where radiation exceeds the 1910.97(a)(2) guide are posted with signs bearing the 1910.97(a)(3) symbol whose lower half states that radiation here may exceed hazard limits, that special precautions are needed and that specific instruction must be obtained before entry (or an equivalent the employer can demonstrate), and measures such as administrative and engineering controls and PPE keep exposure within the guide. Power-line carrier work, including coupling equipment, follows the subpart's energized-line requirements.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.