UL 104-2020 pdf free download

UL 104-2020 pdf free download.Elevator Door Locking Devices and Contacts.
3.2 CAR DOOR OR GATE INTERLOCK — A device having two related and interdependent functions, which are;
a) To prevent the operation of the driving machine by the normal operating device unless the car door Is locked in the closed position.
b) To prevent the opening of the car door from inside the car unless the car Is within the landing zone and Is either stopped or being stopped.
3.3 CLOSED POSITION OF CAR AND HOlS1’NAY DOORS AND GATES – As defined in the Safety Code for Elevators and Escalators, ASME Al 7.1:
a) Horizontally sliding hoistway doors and gates (ASME A17.1, Clause 2.12.2,2):
b) Horizontally sliding car doors and gates (ASME Al 7.1. Clause 2.14.4.11): and
c) Vertically sliding counterweighted and counterbalanced hoistway doors (ASME A17.1, Clause
2.12.3.2).
3.4 DOOR OR GATE ELECTRIC CONTACT — An electrical device, the function of which is to prevent operation of the driving machine by the normal operating device unless the door or gate is in the closed position.
3.5 HOISTWAY DOOR COMBINATION MECHANICAL LOCK AND ELECTRIC CONTACT – A
combination mechanical and electric device with two related, but entirely independent, functions, that are:
a) To prevent operation of the driving machine by the normal operating device unless the hoistway door is in the closed position and
b) To lock the hoistway door in the closed position and prevent it from being opened from the landing side unless the car is within the landing zone.
As there is no positive mechanical connection between the electric contact and the door locking mechanism, this device ensures only that the door will be closed, but not necessarily locked, when the car leaves the landing. Should the lock mechanism fail to operate as intended when released by a stationary or retiring car-cam device, the door can be opened from the landing side even though the car is not at the landing. If operated by a stationary car-cam device, it does not prevent opening the door from the landing side as the car passes the floor.
3.6 HOISTWAY-DOOR OR GATE INTERLOCK — A device having two related and interdependent functions, that are;
a) To prevent the operation of the driving machine by the normal operating device unless the hoistway door is locked in the closed position and.UL 104-2020 pdf free download.