Adds rules for overhead line work, both on and near the lines, and for the live-line barehand method. Before employees climb or load poles, towers or other elevated structures, the employer confirms they can bear the added or unbalanced stresses, bracing or supporting any that cannot (Appendix D offers wood-pole test methods). When a pole is being set, moved or taken down close to an exposed energized overhead conductor, it must not touch the conductor; handlers wear electrical protective equipment or use insulated devices and avoid touching the pole with uninsulated body parts. Pole holes are physically guarded or attended whenever anyone works nearby. Installing and removing overhead lines: where lines being installed or removed could contact energized parts, the tension-stringing method, barriers or equivalent measures limit that possibility. The 1926.959(d)(3) protections apply when failure of pulling or tensioning equipment, of the conductor being pulled, or of existing lines could energize the equipment or conductor. Where new conductors cross over energized conductors above 600 volts, automatic reclosing on the protecting devices is disabled if their design permits. Before stringing lines parallel to energized lines, the employer determines the approximate induced voltage or assumes it hazardous, and places temporary protective grounds to prevent hazardous potential differences unless it shows no hazardous induction or treats the lines as energized. A hazard exists at 1 mA through a 500-ohm resistor if involuntary-reaction hazards are not controlled, or above 6 mA if they are. Reel-handling, pulling and tensioning equipment must be in safe operating condition, leveled and aligned; load ratings of stringing and pulling lines, grips, hardware, rigging and hoists are not exceeded; defective pulling lines and accessories are repaired or replaced; conductor grips go on wire rope only when designed for it; the reel tender and pulling-rig operator keep reliable two-way communication; the rig runs only when safe; and while a power-driven device pulls moving conductor, nobody is directly beneath the overhead work or on the crossarm, apart from guiding the stringing sock or board through the sheave. Live-line barehand work: employees who use or supervise the technique first complete 1926.950(b)-conforming training in it. The employer first ascertains nominal circuit voltage, clearances to ground of the lines and parts, and voltage limits of the equipment. Insulated tools, equipment and aerial devices are designed, tested and made for barehand work and kept clean and dry. Automatic reclosing is disabled where possible. No barehand work is done when adverse weather (for example nearby thunderstorms, high winds, snow or ice storms) would leave it hazardous even with the required practices in place, or when wind cuts clearances below the MAD unless insulating guards cover grounded objects and other lines. A conductive bucket liner or device bonds the aerial device to the line, with the employee connected by conductive shoes, leg clips or similar, plus electrostatic shielding where potential differences are hazardous; the bond is made by positive connection before contact and kept until work ends. Lifts have upper controls within easy reach and lower controls near the boom base able to override, used with an employee aloft only in emergencies; all controls are checked before elevating; the truck body is grounded or barricaded and treated as energized. A boom-current test is done at the start of each day, when a higher voltage is met, and when conditions warrant: the bucket contacts a source at the working voltage for at least 3 minutes with leakage no more than 1 microampere per kV of nominal phase-to-ground voltage, and work stops at any sign of malfunction. Employer-established MADs are kept from grounded objects and other potentials, including while approaching, leaving and bonding, and phase-to-ground MAD from grounded ends of bushings and insulator strings. No handlines between bucket and boom or ground (nonconductive handlines from conductor to ground are allowed if not supported from the bucket), barehand ropes are not reused for other jobs, uninsulated items are not passed between structure and bonded bucket, and a nonconductive measuring device is readily available. Towers and structures: nobody works beneath a tower or structure during work unless shown necessary to assist those above; tag lines control tower sections being raised unless more hazardous; load lines are not detached until the load is secure; and except in emergency restoration, work stops in hazardous adverse weather.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.