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.