Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 7 - ELEVATORS, LIFTS, ESCALATORS, DUMBWAITERS, HOISTS ANDTRAMWAYS › Subchapter B - PASSENGER ELEVATORS › GENERAL PROVISIONS › Section 7.59 - Safety equipment

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Slack cable device.
A slack cable device shall be used in
					 connection with all passenger elevators of the winding drum type, which will
					 automatically shut off the power, apply the brake, and stop the machinery, in
					 case the car is obstructed in its descent. The device shall be so designed and
					 installed that, after functioning, the mere resetting of the device shall not
					 be sufficient to move the elevator car unless the operator is in the car and
					 starts it in the regular manner.
(b)
Limit switches and terminal
					 stops.
Normal terminal stopping devices for electric traction
					 elevators may be located on the car or in the hatchway or in the machine room
					 and shall be operated by the movement of the car. Electric passenger elevators
					 shall be provided with top and bottom final limit switches so connected that
					 the functioning of either switch will automatically shut off the power, apply
					 the brake, and prevent the operation of the elevator in either direction until
					 necessary adjustments are made to again place the elevator in operation. Such
					 switches shall be in addition to directional switches. Limit switches may be
					 located in the shaftway with a cam on the car or on the car with cams in the
					 shaftway. When necessary because of flood conditions, lower shaftway limit
					 switches may be actuated by the counterweight at the top of the shaftway. Cams
					 actuating limit switches shall be composed of metal. Automatic terminal stops
					 shall be provided on the machines of power-driven passenger elevators of the
					 winding drum type, such devices to operate independently of the car-controlling
					 mechanism.
(c)
Brake.
All passenger elevators, except hydraulic, shall be
					 equipped with an effective magnet release brake which is automatically applied
					 when the controlling mechanism of the car is in a stop position. The brake
					 magnet shall be so installed that its action is not retarded by any motor field
					 discharge or counter electro-motive force or by any single ground or accidental
					 short circuit. When direct current elevator motors derive current from an
					 alternating current power source through a nonrotating rectifying unit, means
					 shall be provided to absorb a sufficient amount of energy regenerated by the
					 motors under overhauling load conditions to prevent any elevator from attaining
					 at any time, or under any conditions of load, more than 120% of the contract
					 speed of the elevator. When a single rectifier is installed to supply power for
					 a number of elevators, or elevators in conjunction with other electrical
					 equipment in the building, separate means for absorbing the generated power
					 shall be installed for each elevator and other equipment in the building shall
					 not be depended upon for the absorption of this power.
(d)
Car safeties.
Passenger
					 elevators shall be provided with car safeties as follows:
(1) All passenger elevator cars suspended
					 from cables shall be provided with safeties, located under the car floors. Such
					 safeties shall be capable of stopping or holding the elevator car at any point
					 of its travel.
(2) Passenger
					 elevators having a speed of 100 or less feet per minute shall be provided with
					 car safeties actuated by a centrifugal speed governor, except when the car
					 travel does not exceed 20 feet, in which case car safeties of the spring grip
					 or broken rope type may be used.
(3) When the speed is in excess of 100 feet
					 per minute, regardless of car travel, the car shall be provided with car
					 safeties of the friction clamp or other approved type, actuated by a
					 centrifugal speed governor in such a manner as to bring the elevator car to a
					 gradual stop within a distance of approximately eight feet.
(4) A rack and pawl is not acceptable as a
					 car safety device.
(5) Governor
					 cables shall be iron or steel, monel metal, phosphor bronze or equivalent and
					 shall be not less than 3/8 inch in diameter. Tiller rope construction shall not
					 be used for governor cables except that it may be used for the portion of the
					 cable wound on the safety drum.
(6)
					 The size, material, and construction of the governor rope, and the proper
					 tripping speed of the governor, shall be stamped on the governor stand or on a
					 brass plate attached to it in letters not less than 1/4 inch in
					 height.
(7) Friction-type governors
					 without cable clamp dogs may not be used.