No employer may allow a worker to work so near an electric power circuit that the worker could contact any part of it during the work unless the worker is protected against shock by de-energizing and grounding the circuit or by effectively guarding it with insulation or other means. Where the exact location of underground power lines is not known, workers using bars, jack-hammers or other hand tools that might contact a line must be given insulated protective gloves. Before work starts, the employer must determine, by inquiry, direct observation or instruments, whether an energized power circuit, exposed or concealed, lies where the work could bring workers, their tools or machines into contact, physical or electrical, with it; if so, the employer must post and maintain proper warning signs and tell workers where the lines are, what the hazards are and what protective measures to use. While live parts of electrical equipment are exposed, barriers or other guarding keep its workspace from being used as a passageway, and working spaces, walkways and similar areas are kept clear of cords that would create a hazard. In existing installations circuit protection may not be changed to raise the load above the rating of the circuit wiring. When fuses are put in or taken out with either or both terminals live, special tools insulated for the voltage are used. Worn or frayed cords or cables are not used, and extension cords may not be stapled, hung on nails or suspended by wire.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.