Berkeley Lab

Subcontractor Lockout/Tagout (LOTO)

What is Lockout/Tagout (LOTO)?

  1. LOTO is a formal process for controlling hazardous energy.
  2. LOTO protects personnel working on equipment from the unexpected release of hazardous energy.
  3. Lockout/Tagout (LOTO) is composed of two principal process components:
      • Deenergization removes all energy sources from the system.
      • Control prevents re-energization.

For more information on the general principles of LOTO, please read Appendix C in the ES&H LOTO Program.

Apply to Perform LOTO

LOTO is generally required for all installation, servicing, and maintenance of equipment that has the potential to cause injury, including during construction and demolition.  All subcontractors who perform LOTO must adhere to PUB-3000, Chapter 18, Lockout/Tagout Program, Work Process I.


All non-construction subcontractors, vendors, and manufacturer representatives or other persons performing or participating in LOTO who are not Berkeley Lab employees are required to submit their LOTO Program and LOTO Authorized Person training statement,

Red Lock Keyed Alike

Construct LOTO Request

Non-Construct LOTO Request

and use the LOTO Permit process.

Subcontractor LOTO Permit Button


Subcontractors who will perform work involving lockout/tagout at LBNL are required to have LOTO training. The training explains the subcontractor LBNL Lockout/Tagout process so that each worker has a clear understanding of the safety expectations, the LOTO process, and the different roles and responsibilities associated with work that involves LOTO.

LOTO Training Button