California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 4 - Construction Safety Orders
Article 4 - Dusts, Fumes, Mists, Vapors, and Gases
Section 1533 - Internal Combustion Engines
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Internal combustion engine-driven equipment shall be operated inside buildings or enclosed structures, or, if they are 20 feet or less in depth, inside shafts, culverts, and pipelines, only when such operation does not result in exposure to dangerous gases or fumes in concentrations above the maximum acceptable limits listed in Section 5155 of the General Industry Safety Orders. Some acceptable methods of control are:
(b) When internal combustion engine-driven equipment is operated in shafts that are 20 feet or less in depth into which employees enter, culverts into which employees enter, or pipelines into which employees enter and when a hazardous atmosphere exists or could be reasonably expected to exist, a mechanical ventilation system shall be provided to prevent exposure to internal combustion engine emissions. The ventilation system, which may consist of a mechanical exhaust system, a forced air ventilation (blower) system or a combination of the two, shall:
(c) When internal combustion engine-driven equipment is operated in excavations that are greater than 4 feet in depth into which employees enter, and a hazardous atmosphere exists or could be reasonably expected to exist, employees shall be protected in accordance with the requirements of Section 1541(g).
(d) If any work location subject to subsection (b) is subject to confined space safety orders contained in these orders, the General Industry Safety Orders or other Title 8 safety orders, and if the provisions of subsection (b) are less protective than a confined space safety order, the confined space safety order shall take precedence.
NOTE: For shafts greater than 20 feet in depth and excavations subject to the Tunnel Safety Orders, refer to Title 8, Division 1, Chapter 4, Subchapter 20, the Tunnel Safety Orders.
1. Amendment filed 12-13-84; effective thirtieth day thereafter (Register 84, No. 50).
2. Amendment of subsection (a) and new subsections (b)-(c) filed 5-1-2012; operative 5-31-2012 (Register 2012, No. 18).
3. Amendment of subsections (a) and (b), new subsection (c) and subsection relettering filed 8-29-2013; operative 10-1-2013 (Register 2013, No. 35).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.