Sets the clearance procedure for deenergizing transmission and distribution lines and equipment to protect employees; anything deenergized by any other procedure must be treated as energized. Where a system operator controls the lines and disconnecting means, the employer names one crew member as the clearance holder and follows paragraph (c) in order. With no system operator, the clearance holder also performs the operator's functions and paragraph (c) applies in order, except that for a single crew whose employee in charge has the means of disconnection accessible, visible and under sole control, the request, remote-switch and tag-content steps ((c)(1), (c)(3), (c)(5)) drop away and no tags are needed. Multiple crews on the same lines either work under one employee in charge as a single crew, or each complies independently and, without a system operator, uses its own tags and coordinates deenergizing and reenergizing with the others. Disconnecting means reachable by people outside the employer's control, such as the public, must be made inoperable while open for employee protection. Sequence: the employee in charge asks the system operator to deenergize the specific section and becomes responsible for the clearance. Every switch, disconnector, jumper, tap or other path by which a known energy source could feed the section is opened, made inoperable where the design permits, and tagged to show employees are at work. Automatic and remotely controlled switches able to reclose the opened means are tagged at their control points and their automatic or remote feature disabled where possible. Tags on network protectors may be omitted for primary feeder work if the employer can show every protector trips open immediately when closed onto a deenergized primary, cannot be closed manually without tools with any manual override blocked, locked or disabled, and override procedures first confirm the line is not deenergized for anyone's protection and that the primary is energized. Tags must prohibit operating the disconnecting means and say employees are at work. After the clearance is given, the lines are tested with a voltage-detecting device, grounds are installed per 1926.962, and only then are lines considered deenergized. A clearance is transferred by the employee in charge (or that person's supervisor if illness or emergency forces the holder to leave) telling the system operator and the crew, after which the new holder is responsible. To release, the employee in charge notifies everyone under the clearance, ensures all are clear and all protective grounds are removed, reports this to the system operator and then releases. Only the employee who requested the clearance may release it unless it was transferred. Tags stay until the clearance is released, and nobody begins reenergizing at a disconnection point until grounds are removed, every crew has released its clearance, all employees are clear and all tags there are removed.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.