Unit 5 Flashcards
What is the minimum pallet displacement necessary to activate a pallet level device as per the ASME A17.1/CSA B44 code?
3mm (0.125in)
What safety device is required in the machinery space of an escalator other than a main line disconnect as per the ASME A.17.1/CSA B44 code?
Stop switch
When shall the step up thrust device activate as per the ASME A17.1/CSA B44 code?
UPWARD MORE THAN 5mm (.20in)
What percentage of handrail speed deviation in relation to step/treadway speed will initiate the monitoring alarm to activate, as per ASMEA17.1/CSA B44 code?
15% or more
What device is installed in a moving walk to remove power from the driving machine if the connecting means between pallets or the belt breaks, as per the ASME A17.1/CSA B44 code?
Broken treadway device
How many positions must an escalator starting switch have, as per the ASME A17.1/CSA B44 code?
3 - down, run, up
How must a broke drive chain device be reset, as per the ASME A17.1/CSA B44 code?
Manually
Where are the step level switches located, as per the ASME A17.1/CSA B44 code?
Top & bottom
What is the maximum treadway speed for a walkway with a slope of 8 degrees or less, as per the ASME A17.1/CSA B44 code?
0.9m/s (180ft/min)
What is the maximum allowable average stopping rate for escalator brakes, as per the ASME A17.1/CSA B44 code?
No greater than .91m/s2 (3ft/s2)
What is the maximum applied vertical force allowed in the upward direction to a comb-step impact device before it must remove power to the driving machine, as per the ASME A17.1/B44 code?
670n (150lbf)
What is the maximum speed at which an escalator can operate, as per the ASME A17.1/CSA B44 code?
100fpm
What device is unique to a curved escalator , as per the ASME A17.1/CSA B44 code?
Step lateral displacement device
How must a reversal stop switch device be reset?
Manually
Where must emergency stop buttons be located on an escalator ?
Top & bottom landing on right side
