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One or a combination of several types of signal systems may be used: manual signals, audible signals, or electrical signals. Whatever the system in use, a copy of the signals shall be posted in a conspicuous place on or near each landing and at the hoist operator's position. The height of the tower and the number of wells in the tower shall be the determining factor in selecting the type of signals for safe operation.
(a) One-Hand Signals to Hoist Operators.
(1) Hoist: Forearm vertical and forefinger pointing upward, move hand in small horizontal circle.
(2) Lower: Arm extended and palm down, move hand in small vertical circle.
(3) Stop: Arm extended horizontally and palm down, hold position rigidly.
(4) Emergency Stop: Both arms extended horizontally but move hands rapidly right and left.
(5) Dog Off Load: With forearms extended vertically, clasp and unclasp fists several times.
(b) Two-Hand Signals to Hoist Operators.
(1) Hoist: Hold both arms horizontal at sides, fully extended, move upward and return.
(2) Lower: Let arms hang at sides, fully extended, move out and return.
(3) Stop: Hold both arms horizontal at sides, fully extended; hold position rigidly.
(4) Emergency Stop: Hold both arms horizontal at sides, fully extended; move both arms rapidly from back to front.
(5) Dog Off Load: Clasp fingers of one hand with fingers of the other, palms facing each other.
(c) Audible Signals.
Audible signals shall not be used when there are surrounding noises of the same, or nearly the same, frequency and octave level. Signals given by means of a whistle, bell, horn, or other audible means are as follows:
(1) Hoist: Two short blasts or gongs.
(2) Lower: Three short blasts or gongs.
(3) Slow: Four long blasts or gongs.
(4) Stop: One short blast or gong.
(5) Emergency Stop: Series of short blasts or gongs.
(6) Dog Off Load: One long blast or gong.
(d) Electrical Signals.
An electrical signal system utilizing bells or lights may be used. A bell signal system that does not register landing calls shall use the signals indicated in the preceding paragraph to control movement of the platform or bucket. One of two types of light systems, either a general system or a specific call system, may be installed.
(1) General Light Systems.
The necessary light or lights shall be so located at the hoist operator's station that they are readily visible to him at all times. A call button must be installed at each landing. Control of the hoist platform or bucket is governed by the following light signals:
(A) Hoist: Two lights or two light flashes.
(B) Lower: Three lights or three light flashes.
(C) Stop: One light or one light flash.
(D) Emergency Stop: Series of light flashes.
(E) Dog Off Load: One long light or lighting of separate dog-off light.
(2) Specific Call Light Systems.
A light to indicate each floor landing shall be installed in the most visible position at the hoist operator's station. A call signal button shall be installed at each landing. When the platform or bucket is needed at a certain floor, the call signal button registers that location on the proper light at the operator's station. Signals for movement may be given by audible or visible means.
(e) Electrical Intercommunication Systems.
(1) Electrical intercommunication systems may be installed. The wiring for such systems shall comply with the pertinent provisions of the Electrical Safety Orders.
(2) Speakers shall be so located at the hoist operator's position that he can communicate with all stations. A speaker shall also be located at each landing so that communication can be maintained with the hoist operator.
(3) Mechanical and electrical signal systems shall be inspected daily. Excessively worn or damaged parts shall be replaced immediately.
(4) All wires, cords, or other devices used in connection with signal systems shall be protected against unauthorized or unintentional use, breakage, or interference.