R 408.13838 Jacks; use.

Rule 3838. (1) The rated capacity of a jack shall not be exceeded. The rated capacity shall be permanently marked on the jack. (2) A jack shall be set on or against a firm foundation or blocking. If a jack, at the point of contact with the load, can slip, a wood block or nonslip device shall be placed between the cap and the load. (3) A jack shall be equipped with a means such as, but not limited to, a stop, a bypass, an indicator or other device which shall be watched to prevent overrun. (4) After a load has been raised or moved, it shall be secured by cribbing, blocks or stands before work is started under or between the supported load. (5) A hydraulic jack exposed to freezing temperatures shall be protected by use of an anti-freeze liquid.