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29 C.F.R. § 1919.28

Unit proof tests—cranes and gear accessory thereto.

§ 1919.28 Unit proof tests—cranes and gear accessory thereto.

(a) Except as noted in paragraph (e) of this section, cranes and other hoisting machines, together with gear accessory thereto, shall be tested with a proof load which shall exceed the safe working load as follows:

Safe working load Proof load
Up to 20 tons25 percent in excess.
20–50 tons5 tons in excess.
Over 50 tons10 percent in excess.

(b) The proof load shall be lifted and swung as far as possible in both directions. If the jib or boom of the crane has a variable radius, it shall be tested with proof loads, as specified in paragraph (a) of this section, at the maximum and minimum radii. In the case of hydraulic cranes, when due to the limitation of pressure it is impossible to lift a load 25 percent in excess of the safe working load, it will be sufficient to lift the greatest possible load.

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