CET Machine Room & Pit Equipment Flashcards
6 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CET Machine Room & Pit Equipment flashcards as text
What is the minimum headroom clearance required above elevator machine room equipment per ASME A17.1?
Answer: 7 feet
ASME A17.1 requires a minimum headroom clearance of 7 feet (2134 mm) above the working surfaces in machine rooms.
Which device in the elevator pit is used to slow and stop the car or counterweight in the event of an overspeed descent?
Answer: Car safety device
The car safety device (safeties) clamps onto the guide rails to stop the car when the governor detects an overspeed condition.
What is the purpose of the pit stop switch on a traction elevator?
Answer: De-energizes the elevator for pit maintenance
The pit stop switch is a red emergency stop switch that cuts power to the elevator to allow safe maintenance work inside the pit.
What is the minimum pit depth required for most standard traction elevators under ASME A17.1?
Answer: 48 inches
ASME A17.1 typically requires a minimum pit depth of 48 inches (1219 mm) for standard traction elevators to accommodate buffers and clearances.
What type of lighting is required in an elevator machine room?
Answer: Permanent artificial illumination of at least 19 foot-candles
ASME A17.1 requires permanent artificial lighting providing a minimum of 19 foot-candles (200 lux) at the floor level in machine rooms.
What is the function of the oil buffer in the elevator pit?
Answer: Absorbs kinetic energy to decelerate the car or counterweight
Oil buffers absorb and dissipate the kinetic energy of an elevator car or counterweight running into them, preventing sudden impact.