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§ 1926.305 Jacks—lever and ratchet, screw, and hydraulic.
(a) General requirements. (1) The manufacturer's rated capacity shall be legibly marked on all jacks and shall not be exceeded.
(2) All jacks shall have a positive stop to prevent overtravel.
(b) [Reserved]
(c) Blocking. When it is necessary to provide a firm foundation, the base of the jack shall be blocked or cribbed. Where there is a possibility of slippage of the metal cap of the jack, a wood block shall be placed between the cap and the load.