184.108.40.206.1 Escalator Driving-Machine Brake
(a) Each escalator driving machine shall be provided with an electrically released and mechanically or magnetically applied brake. If the brake is magnetically applied, a ceramic permanent magnet shall be used. There shall be no intentional time delay designed into the application of the brake, except as permitted in 220.127.116.11.4(b).
(b) The brake shall be applied automatically if the electrical power supply is interrupted. The brake shall be capable of stopping the down-running escalator with any load up to the brake rated load [see 18.104.22.168.3(a)(2) or 22.214.171.124.3(b)(2)]. The brake shall hold the stopped escalator with any load up to the brake rated load [see 126.96.36.199.3(a)(1) or 188.8.131.52.3(b)(1)].
(c) Driving-machine brakes shall stop the down-running escalator steps at an average rate not greater than 0.91 m/s2 (3 ft/s2) as measured over the total retardation time. No peak horizontal retardation value exceeding 0.91 m/s2 (3 ft/s2) shall have a time duration greater than 0.125 s (see Nonmandatory Appendix I, Figure I-11). (See also 184.108.40.206.6.)
(d) The escalator brake shall be provided with a data plate that is readily visible and located on the machine brake, and when necessary, a duplicate data plate with the certification mark shall be placed adjacent to the machine brake. The data plate shall indicate
(1) brake torque and related data as follows:
(-a) for fixed-torque brakes, the range of brake torque that complies with 220.127.116.11.1 and 18.104.22.168.6
(2) the method of measuring the torque, designated "BREAKAWAY" or "DYNAMIC," based on the method used when measuring the torque
(4) the type of brake, i.e., fixed or variable torque
(5) the maximum stopping distance with rated load in the down direction that corresponds to the minimum distance between either
(e) Where means other than a continuous shaft, mechanical coupling, or toothed gearing is used to connect the motor to a gear reducer, the escalator driving-machine brake shall be located on the gear reducer or main driveshaft.