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If the escalator driving-machine brake is separated from the main driveshaft by chain used to connect the driving machine to the main driveshaft, either
(a) a mechanically applied or permanent magnet brake capable of stopping and holding a down-running escalator with brake rated load (see 6.1.3.9.3) shall be provided on the main driveshaft
(b) multiple and separate chains, each with an individual drive-chain device in accordance with 6.1.6.3.4 and each with connection to the escalator driving-machine brake(s) and/or other brake(s) with capacity capable of stopping and holding a down-running escalator with brake rated load (see 6.1.3.9.3), shall be provided
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6.1.5 Escalators and Moving Walks, Driving Machine, Motor, and Brake
-machine brake is separated from the main driveshaft by chain used to connect the driving machine to the main driveshaft, either (a) a mechanically ...