This STD provides clarification for 29 CFR 1910.179(e)(6)(i) - Overhead and Gantry Cranes and (g)(2)(i) and 1910.181(j)(1)(i) - Derricks, and 1926.550(d)(4) and (e); clarification of the term "normal operating conditions." Old STD number: 3-12.4 - Interpretation of "Normal Operating Conditions" for Overhead and Gantry Cranes, and Derricks. Note: 1926.550 is "Reserved". For overhead & gantry cranes in construction, reference 1926.1438.

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