§ 33.112. 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 such signal system is out of order. A pull bell system for emergency use when the regular system is out of order shall be accepted, if its use is limited to emergency situations only. Calling or rapping shall not be used as a method of signaling except in accident or emergency situations.
(b) The signal code in use in a mine 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 so constructed and located as to be audible and visible to the hoisting engineer at all times.
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