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OSHA 29 CFR 1910.147 requires documented energy control before servicing equipment where unexpected startup could injure a worker. On residential and light-commercial jobs this most often means an electrical disconnect, a gas valve, or stored pressure in a refrigerant circuit.
HVAC service techs, electricians, plumbers and mechanical crews servicing energized or pressurized equipment.
Requirements around this document change at the state line. Pick your state for the rules that apply to your license.
Requirements vary by jurisdiction. Always confirm final submittal requirements with the authority having jurisdiction before filing.