Standard Interpretations - Table of Contents
• Standard Number: 1910.179; 1910.179(i)



March 30, 2010

Mr. Bill Schroeder
2308 Pahounui Drive
Honolulu, HI. 96819

Dear Mr. Schroeder:

Thank you for your May 8, 2009, letter to the Occupational Safety and Health Administration's (OSHA's) Directorate of Enforcement Programs (DEP). Your letter has been referred to DEP's Office of General Industry Enforcement for an answer regarding OSHA's Crane Standard 1910.179. Your question has been restated below for clarity.

Question 1: Does OSHA consider a visual rotating beacon or strobe light an acceptable warning signal on a radio operated crane?

Response: Title 29 CFR 1910.179(i), warning devices, states: [e]xcept for floor operated cranes a gong or other effective warning signal shall be provided for each crane equipped with a power traveling mechanism. Although the source of 29 CFR 1910.179 did not provide specific examples of an "effective warning signal," ANSI standard B30.2-1967, Overhead and Gantry Cranes, a subsequent revision of this standard, ASME B30.2-2005, Overhead and Gantry Cranes 2-1.15.3 Types of Devices, states that [one]ne or more of the following devices shall be provided when require:

  1. Manually operated gong
  2. Power-operated bell, siren, or horn
  3. Rotating beacon
  4. Strobe light

Under OSHA's de minimis policy, which allows employers to comply with updated versions of a source standard if the newer standard provides equal or greater employee protection, no citation would be issued. De minimis conditions are those which have no direct or immediate relationship to safety and health. Beca