18 P. Jack operation. a. The base of the jack shall be blocked or cribbed when it is necessary to provide a firm foundation. Where there is a possibility of slippage of the metal cap of the jacks, a wood block shall be placed between the cap and the load. b. Never work under a vehicle that is supported only by a jack. 5-10 Welding Precautions A. Only employees trained in the use of welding equipment shall operate either electric or acetylene welding equipment. B. Welders must be constantly alert to the hazards of such activity and shall take necessary precautions to protect themselves, other employees, and the public. C. Welders and helpers shall wear suitable gloves, shoes, clothing, and helmets when cutting and/or welding. 5-11 Electrical Installation (Both Permanent and Temporary) A. Prior to performing any work on energy systems, a lockout and tag shall be installed at the point of de-energization. Other employees may not remove the lockout/tag. B. No employee shall work in such proximity to any part of an electrical power circuit that he/she may contact the same in the course of work unless personal protective equipment against electrical shock is provided and in use or unless the circuit has been de-energized, grounded, or insulated in some other way. C. Before commencing work, employees must determine whether any part of an electric power circuit, exposed or concealed, is so located that the performance of the work may bring the employee into contact with it. All employees shall obey warning signs posted around such work. D. In work areas where the exact location of underground electric power line is unknown, employees using jack-hammers, bars, or other hand tools which may contact a power line must locate lines prior to commencing work and shall use insulated protective gloves. 5-12 Material Handling and Lifting A. Since the handling of material is one of the most frequent sources of accidents resulting in back injuries, sprains, strains, lacerations, bruises, and crushed hands and toes, the teaching and enforcement of safe methods of lifting and handling material is one of the supervisor’s most essential functions. B. Employees are limited to continuous lifting of weights of 50 pounds or less.
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