This information is provided free of charge by the Department of Industrial Relations
from its web site at www.dir.ca.gov. These regulations are for the
convenience of the user and no representation or warranty is made that the information
is current or accurate. See full disclaimer at http://www.dir.ca.gov/od_pub/disclaimer.html.
Subchapter 5. Electrical Safety Orders
Group 1. Low-Voltage Electrical Safety Orders
Article 3. Work Procedures
§2320.4. De-Energized Equipment or Systems.
Lockout/Blockout Methods and Sample Procedures
(a) An authorized person shall be responsible for the following before working on de-energized electrical equipment or systems unless the equipment is physically removed from the wiring system:
(1) Notifying all involved personnel.
(2) Locking the disconnecting means in the “open” position with the use of lockable devices, such as padlocks, combination locks or disconnecting of the conductor(s) or other positive methods or procedures which will effectively prevent unexpected or inadvertent energizing of a designated circuit, equipment or appliance. Note:See also Section 3314 of the General Industry Safety Orders (GISO) for lock-out requirements pertaining to the cleaning, repairing, servicing and adjusting of prime movers, machinery and equipment.
Exception: Locking is not required under the following conditions: (A) Where tagging procedures are used as specified in subsection (a)(3), and (B) Where the disconnecting means is accessible only to personnel instructed in these tagging procedures.
(3) Tagging the disconnecting means with suitable accident prevention tags conforming to the provisions of Section 2320.6 and GISO Section 3314(e).
(4) Effectively blocking the operation or dissipating the energy of all stored energy devices which present a hazard, such as capacitors or pneumatic, spring-loaded and like mechanisms.
1. Editorial correction (Register 79, No. 15).
2. Amendment of subsection (a)(4) filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).
3. Amendment filed 3-3-99; operative 4-2-99 (Register 99, No. 10).
Go Back to Article 3 Table of Contents