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Construction Safety5 min

Lockout/Tagout (LOTO) for Construction

Reference: OSHA 1910.147

Key Talking Points

  • Lockout/Tagout prevents the unexpected startup or release of stored energy during maintenance and servicing. OSHA 1910.147 (general industry) and 1926.417 (construction electrical) both apply on construction sites depending on the energy source.
  • Hazardous energy includes electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and gravitational. On construction sites, you may encounter live panels, pressurized lines, heavy suspended loads, and equipment with stored spring energy.
  • The six-step LOTO procedure: (1) Identify all energy sources, (2) Notify affected employees, (3) Shut down the equipment using normal controls, (4) Isolate energy at the source, (5) Apply your personal lock and tag, (6) Verify zero energy by attempting to restart.
  • Each worker exposed to the hazard must apply their own lock. In group lockout situations, a single authorized employee coordinates the procedure, and each crew member places a personal lock on a group lockout device (hasp). No one removes another worker's lock.
  • Tags alone are not sufficient — they are warning devices only. A lock physically prevents the energy-isolating device from being operated. Always use a lock; add a tag for identification.

DO

  • Apply your own personal lock and tag — never rely on someone else's lock
  • Verify zero energy after lockout by trying the start button and testing with appropriate instruments
  • Account for all forms of stored energy — bleed pressure lines, block raised components, discharge capacitors
  • Follow your company's written LOTO procedure for each piece of equipment
  • Communicate with all affected workers before applying or removing locks

DON'T

  • Remove another worker's lock under any circumstances without the authorized removal procedure
  • Use a tag without a lock — tags warn but do not prevent activation
  • Assume a circuit is dead without testing — always verify with a rated voltage tester
  • Bypass interlocks, safety devices, or machine guards during servicing
  • Energize equipment until all workers are clear and all locks are removed by their owners

Discussion Questions

  1. What types of hazardous energy are present on our current jobsite, and where are the isolation points?
  2. Walk through the 6-step LOTO procedure for a piece of equipment we service regularly.
  3. What is the correct procedure if a worker leaves the site and their lock is still on the hasp?