CET CET Machine Room & Pit Equipment

Question 1

What is the minimum headroom clearance required above elevator machine room equipment per ASME A17.1?

Accepted Answer

7 feet

Answer

ASME A17.1 requires a minimum headroom clearance of 7 feet (2134 mm) above the working surfaces in machine rooms.

Question 2

Which device in the elevator pit is used to slow and stop the car or counterweight in the event of an overspeed descent?

Accepted Answer

Car safety device

Answer

The car safety device (safeties) clamps onto the guide rails to stop the car when the governor detects an overspeed condition.

Question 3

What is the purpose of the pit stop switch on a traction elevator?

Accepted Answer

De-energizes the elevator for pit maintenance

Answer

The pit stop switch is a red emergency stop switch that cuts power to the elevator to allow safe maintenance work inside the pit.

Question 4

What is the minimum pit depth required for most standard traction elevators under ASME A17.1?

Accepted Answer

48 inches

Answer

ASME A17.1 typically requires a minimum pit depth of 48 inches (1219 mm) for standard traction elevators to accommodate buffers and clearances.

Question 5

What type of lighting is required in an elevator machine room?

Accepted Answer

Permanent artificial illumination of at least 19 foot-candles

Answer

ASME A17.1 requires permanent artificial lighting providing a minimum of 19 foot-candles (200 lux) at the floor level in machine rooms.

(CET) Certified Elevator Technician Practice Test