29 CFR 1910.146: OSHA Confined Space Standard – General Industry
Date adopted: January 14, 1993
In January, 1993, OSHA promulgated a standard that requires employers to protect employees assigned to enter Permit-Required Confined Spaces from these hazards. Subsequent revisions clarified several provisions of the rule and revised the "Atmospheric Monitoring" section of non-mandatory Appendix E, "Sewer System Entry."