A minimum clearance from overhead lines must be worked out before starting and then kept; extra caution is needed at height, where a small shock can cause a fatal fall, and fall-arrest systems, safety equipment and PPE must be used; any safety observer must be skilled in rescue. Poles and structures must be tested and inspected for soundness before climbing or accessing by EWP, and EWPs should be used where practicable; climbing should be a last resort, justified against higher-order height controls. Climbing a pole or structure is only allowed for a person who is authorized, trained and competent, a safe-to-climb assessment shows no danger of collapse (wooden poles in service 25 years or more may need reinforcing; changing loads need particular care), minimum approach distances to other live circuits are maintained or those circuits are de-energized, safety equipment including fall arrest and pole-top rescue kits is on site, and a safety observer is present if the risk assessment requires one.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.