Archive Notice - OSHA Archive

NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.

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. This 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. To keep apprised of such developments, you can consult OSHA's website at

September 8, 1978

Mr. J. A. Torres
Division Chief Architect
Bechtel Power Corporation
P. O. Box 607
15740 Shady Grove Road
Gaithersburg, Maryland 20760

Dear Mr. Torres:

This is in response to your letter requesting OSHA concurrence on the use of 3/4" square bars for rungs on fixed ladders.

A fixed ladder rung configuration using 3/4" square bars with the rungs placed on an angle (flat surfaces are in a 45-degree angle with the ground), satisfying the design requirements in 29 CFR 1910.27(a)(1), meets the requirements of 29 CFR 1910.27(b)(1)(i) of the General Industry Safety and Health Standards.

If I may be of any further assistance, please feel free to contact me.



John K. Barto, Chief
Division of Occupational
Safety Programming

[Corrected January 22, 2008]