Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

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Date Title Standard Number
Duty of building owners to determine the presence, location, and quantity of ACM and PACM. 1910.1001(j)(2)(i), 1910.1001(j)(1), 1910.1001(b)
Verification procedures for group lockout/tagout. 1910.147(d), 1910.269(d), 1910.333(b)(2)(iv)(B)
Confined space requirements for a testing chamber with/without limited access. 1910.146(c), 1910.146(c)(5)
Guarding/hazards of using woodcutting sawblades on a cut-off machine 1910.243(a)(1)(i), 1910.212, 1910.213(r)(4)
OSHA policies concerning employees working at home. 1904.14, 1910.1200(g), 1910.147, 1910.146, 1910.132
Disclosure of OSHA 200 log; SIC 87 exempt from 200 log maintenance. 1904.8, 1904.16, 1904.17, 1904.21
OSHA has no specific regulations regarding minors 1975.3
LOTO of hydraulic systems; postal workers' exposure to hazardous material spills. 1910.147, 1910 Subpart S, 1910.120(q), 1910.1030, 1910.1200
OSHA policy regarding PEL adjustments for extended work shifts. 1910.95, 1910 Subpart Z
Stair rail height must be between 30-34 inches. 1910.24(h), 1910.23(e)(2)
OSHA will not currently pursue a national MSDS repository. 1910.1200(g)
Application of hatch covers to the Bilco Type "S" Roof Scuttle. 1910.27(c)(7)
Clarification of OSHA's CPL 2-1.30 regarding tractor trailer chocking. 1910.178(k)(1), 1910.178(m)(7)
Training for travel lift (mobile gantry crane) operators. 1910.178(l), 1910.179(a)(35), 1910.179(b)(8)
Clarification of HIV and HBV research and clinical laboratories. 1910.1030(b), 1910.1030(e)
Questions regarding the cleaning of asbestos-containing floor tile. 1910.1001(k)(7), 1926.1101(l)(3)
PSM coverage of oil and gas production and separation facilities. 1910.119(a), 1926.64(a)
Use of "generic" LOTO procedures in conjunction with "work authorization permits". 1910.147(c)(1), 1910.147(d)(3), 1903.14(f)
Powered industrial truck requirements regarding "split-forking" and "bulldozing." 1910.178(o)(1), 1910.178(l)(3)(i)(M)
Bloodborne Pathogens: Handwashing facilities must be readily accessible. 1910.1030(d)(2)(iii), 1910.1030(d)(2)(v), 1910.1030(d)(2)(vi)