2.7.5 Working Areas Inside the Hoistway and in the Pit
(b) support not less than the unbalanced weight of the system with no load and up to rated load (see also 2.16.8) in the car and all suspension ropes in place. The minimum factor of safety shall be not less than 3.5, and the materials used shall not have an elongation of less than 15% in a length of 50 mm (2 in.) when tested in accordance with ASTM E8.
(d) not cause stresses and deflections that exceed the applicable requirements for the structure(s) to which the means transmits load based on 100% of the static unbalanced weight of the system (see also 2.16.8).
(e) have a sign in conformance with the requirements of ANSI Z535.2 or CAN/CSA-Z321, whichever is applicable, that shall be prominently posted in the work area stating, "WARNING! Engage_________ before maintaining or inspecting brake, emergency brake, or controller. Follow the manufacturer's instructions for use of __________" (see 22.214.171.124). Unless the means has been designed to support not less than the unsuspended car with rated load (see also 2.16.8), it shall also contain the following wording: "Elevator suspension means must be in place during use." Where there is no maintenance or inspection required that could cause unexpected car motion and where it is not necessary to engage the means, the words "brake, emergency brake, or" may be omitted from the sign.
NOTE: Substitute the actual name of the means for "__________" in the above signage.
(f) be designed to prevent accidental disengagement.
(g) when engaged, not require electrical power or the completion or maintenance of an electrical circuit to remain engaged.
The use of the car top emergency exit for egress and reentry is permitted subject to the following:
(a) All edges of the exit opening are smooth and free of burrs.
(b) Means shall be provided to descend safely to the floor of the car and to subsequently ascend safely to the car top.
(c) The means required in 126.96.36.199.1 shall not be arranged to be engaged at a position that would permit a vertical gap between the bottom of the vertical face of the platform guard and the elevator landing sill.
(a) a key-operated lock capable of being locked without a key
(b) a mechanical device to stop vertical car movement to create a vertical clearance as required by 27.4.5 between the floor of the working area and the lowest part of the car, and between the floor of the working area and the counterweight where a counterweight guard in conformance with 2.3.2 is not provided
(1) The mechanical device shall be able to stop vertical car movement at up to and including 115% of rated speed with rated load. The retardation shall not exceed that required by 2.22.3 or 2.22.4, as applicable.
(2) The mechanical device shall be permitted to be moved into the active position manually or automatically.
(3) When the mechanical device is in the active position, it shall operate an electrical contact that, when in the open position, shall permit the car to move only on inspection operation [see 188.8.131.52.1 and 184.108.40.206.1(d)]. The electrical contact shall be positively opened mechanically and its opening shall not depend solely on springs.
(4) A sign in conformance with the requirements of ANSI Z535.2 or CAN/CSA-Z321, whichever is applicable, shall be prominently posted in the work area stating, "WARNING! Position________ before maintaining or inspecting brake, emergency brake, or controller. Follow manufacturer's instructions for use of _______" (see 220.127.116.11).
NOTE: Substitute the actual name of the device for "_________" in the above signage.
(5) The mechanical device shall be designed to prevent accidental movement from the active position.
(6) The mechanical device shall not require electrical power or the completion or maintenance of an electrical circuit to be maintained in the active position.
(a) Where the egress is through the landing door
(1) the landing door shall be openable from the hoistway side
(2) the means shall be arranged to provide vertical clearance of not less than 1220 mm (48 in.) between the bottom edge of the platform guard and the elevator landing
(a) where retractable stops are provided and the car is
(1) below the platform, the travel of the elevator shall be limited by a retractable stop(s) in such a manner that the car shall be stopped below the platform atleast the distance required for top-of-car clearance (see 2.4.7)
(2) above the platform, the travel of the elevator shall be limited by a retractable stop(s) in such a manner that the car shall be stopped above the platform at least the distance required in 18.104.22.168
(a) be equipped with a retractable stop electrical device(s) (see 22.214.171.124), which shall cause the power to be removed from the elevator driving-machine motor and brake, unless the stops are completely in the retracted position.
(b) be permitted to be equipped with an electrical device(s) that permits operation of the car only on inspection operation when the platform is in the operating position and the stop(s) is in the fully extended position. When provided with such an electrical device and the stop(s) is in the extended position, an additional stopping device conforming to 126.96.36.199 and 188.8.131.52 through 184.108.40.206 shall cause the car to stop before it strikes the movable stop(s). This additional stopping device shall be rendered ineffective when the stop(s) is in the retracted position. Any electrical device(s) used to render the additional stopping device ineffective shall be in conformance with 220.127.116.11, 18.104.22.168.1(a), 22.214.171.124.2, and 126.96.36.199.
(c) be operable from outside the hoistway or from the platform.
(e) be designed to prevent accidental disengagement.