Escalator & Moving Walk Systems Flashcards

What type of lubrication system is commonly used on modern escalator step chains?

Answer: Automatic oil drip or spray lubrication system

Modern escalators use automatic chain lubrication systems that periodically apply oil or grease to minimize wear and reduce maintenance intervals.

Which NFPA standard governs fire safety requirements for escalators and moving walks in buildings?

Answer: NFPA 101

NFPA 101 (Life Safety Code) addresses escalator use as a means of egress and includes fire safety requirements for escalator openings between floors.

What is the primary purpose of the tension carriage (take-up) on an escalator?

Answer: Maintains proper step-chain tension to prevent slack and skip

The tension carriage applies a constant load to the return-run step chain to maintain proper tension, preventing sagging, skipping, or derailment.

An escalator's rated speed is defined as speed measured at the:

Answer: Step tread surface in the direction of travel

Rated speed refers to the velocity of the step tread surface in the direction of travel, typically measured in feet per minute.

What does a 'step sag' or 'step level' device detect on an escalator?

Answer: A step that has dropped below the plane of adjacent steps

A step level switch detects when a step sags or rises out of the normal tread plane, triggering an emergency stop to prevent a tripping hazard.

Under ASME A17.1, what is the required minimum width of the escalator step tread (clear width between balustrades)?

Answer: 32 inches

ASME A17.1 requires a minimum nominal step width of 24 inches, though 32-inch and 48-inch widths are the most common commercial sizes.

Which component prevents passengers from inserting objects between the handrail and the balustrade deck at the newel?

Answer: Handrail entry guard (deflector)

Handrail entry guards are installed where the handrail enters the newel to prevent hands, clothing, or objects from being drawn into the handrail slot.