184.108.40.206 Working Areas in the Car or on the Car Top
(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 220.127.116.11). 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 18.104.22.168.1 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