34 Pa. Code § 7.72 - Electric passenger elevators
(a)
Electric passenger elevators operated by polyphase alternating current motors
shall be provided with relays of the potential type or other approved devices
which prevent the starting of the motor if the phase rotation is in the wrong
direction, or if there is a failure in any phase.
(b) No potential difference in excess of 250
volts shall be used in connection with the car switch or automatic control
circuits of electric passenger elevators. When direct current is the only
available source of power supply and it is impracticable to keep within this
requirement, application may be made to the Department for special permission
to use a higher voltage. Full information shall be given with every application
for special permit. When stepdown transformers are used in connection with
alternating current car switch and automatic control circuits, they shall be of
the two-winding type.
(c) The
machine controllers of electric passenger elevators shall be equipped with a
potential switch of either the manually or power-closing type, so designed that
when the current is interrupted from any cause whatever it will automatically
apply the brake and stop the elevator car.
(d) An emergency switch shall be installed in
every electric elevator car except automatic control. Such emergency switch
shall operate to open a main line switch independent of the car-controlling
circuit wiring.
(e) When the power
for elevator control circuits is dependent upon main line circuit breakers,
potential switches, or other similar electric apparatus, connections shall be
made so that the operation of any fire alarm system which may be connected to
such main line circuit breakers, potential switches, or other similar electric
apparatus, does not cut off the power to the elevator control
circuit.
(f) Switches shall be
provided in connection with electric passenger elevators so that the motor
control circuit and the brake control circuit shall be opened before or at the
time the governor trips, or, in existing installations, when the safety
operates as well.
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