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.

Date	Title	Standard Number
12/15/1977	Standards regulating access for tubular steel scaffolding.	1926.451(a)(13), 1926.450
12/14/1977	A knot in a wire rope is a recognized hazard for material handling.	1926.251(c)(3), 1915.112(b)(4), 1917.42(b)(5), 1918.62(b)(6)
12/12/1977	Insulate or guard the employee from the energized part.	1926.950(c)(1)(i)
11/30/1977	Roll-Over Protection Structures (ROPS) of the safety and health regulations for construction and agriculture.	1928.52, 1928.53
11/30/1977	Requirement for ground-fault circuit interrupter (GFCI) protection to the Ship Repairing Industry.	1910.309
11/30/1977	Elliott Company's plant-wide hard hat program.	1910.135
11/23/1977	Supports required for safety nets.	1926.105
11/18/1977	Use of silver chloride dry cells as a power source for testing electric blast caps.	1926.906, 1910.109
11/16/1977	Positive identification of persons working underground in tunnels and shafts, caissons, cofferdams, compressed air tunnels.	1926.800(c), 1926.803
10/27/1977	Requirements for marking safety cans.	1910.144
10/12/1977	Carbon zinc batteries in blasting galvanometers.	1926.906(q), 1910.109(e)(4)(vii)
10/11/1977	The point of operation guarding on the Biro Power Meat Cutters (bandsaws).	1910.212, 1910.213
10/07/1977	Double-insulated tools and ground-fault protection on construction sites.	1926.400
10/06/1977	Applicability of 29 CFR 1910.107 Spray Finishing Using Flammable and Combustible Materials as Referenced in 29 CFR 1910.94(c) Spray Finishing Operations.	1910.107, 1910.94(c)
10/05/1977	Requirements for wire rope fittings (CASTLOK Bend-Master) in construction.	1926.251(c)
10/03/1977	Non-Serious Becoming Serious article.
09/28/1977	What percent of detected flammable gas will require an employee withdrawal.	1926.800(c)(2)(vi)
09/27/1977	De minimis provision for Floor Loading Protection	1910.22(d)(1)
09/27/1977	"Normal operating conditions" for overhead and gantry cranes include maintenance activity.	1910.179(e)(6)(i), 1910.179(g)(2)(i)
09/22/1977	Flooring requirements for skeleton steel construction in tiered buildings.	1926.750

Letters of Interpretation

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