§ 33.234. Signal system.
(a) Each hoisting engine operating in a slope or shaft shall have an efficient signal system. No hoisting engine shall be operated when the signal system is out of order. Calling or rapping shall not be used as a method of signaling except in case of accident or emergency.
(b) The signal code in use in a cavern shall be prominently posted in the engine room within easy sight of the hoisting engineer. It shall also be posted at all places from which signals are given. These signal codes shall be printed in heavy plain type.
(c) Each signal system operated in connection with a hoisting engine shall be constructed and located so as to be audible and visable to the hoisting engineer at all times.
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