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6.1.4.1.1
The rated speed shall be not more than 0.5 m/s (100 ft/min), measured along the centerline of the steps in the direction of travel.
The speed attained by an escalator after start-up shall not be intentionally varied, except as permitted by 6.1.4.1.2.
6.1.4.1.2
Variation of the escalator speed after start-up shall be permitted, provided the escalator installation conforms to all of the following:
(a) The acceleration and deceleration rates shall not exceed 0.3 m/s2 (1.0 ft/s2).
(b) The rated speed is not exceeded.
(c) The minimum speed shall be not less than 0.05 m/s (10 ft/min).
(d) The speed shall not automatically vary during inspection operation.
(e) Passenger detection means shall be provided at both landings of the escalator such that
(1) detection of any approaching passenger shall cause the escalator to accelerate to or maintain the full escalator speed conforming to (a) through (d)
(2) detection of any approaching passenger shall occur sufficiently in advance of boarding to cause the escalator to attain full operating speed before a passenger walking at normal speed [1.35 m/s (270 ft/min)] reaches the combplate
(3) it shall remain active at the egress landing to detect any passenger approaching against the direction of escalator travel and shall cause the escalator to accelerate to full rated speed and sound the alarm (see 6.1.6.3.1) at the approaching landing before the passenger reaches the combplate
(f) Automatic deceleration shall not occur before a period of time has elapsed since the last passenger detection that is greater than 3 times the amount of time necessary to transfer a passenger between landings.
(g) Means shall be provided to detect failure of the passenger detection means and shall cause the escalator to operate at full rated speed only.

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