CET Modernization & Upgrades 3

Question 1

An elevator modernization includes upgrading the safeties. When must a new governor be installed along with new safeties?

Accepted Answer

When the governor's tripping speed is incompatible with the new safety's design speed

Answer

The governor must be replaced if its tripping speed does not match the rated speed requirements of the newly installed safeties.

Question 2

During modernization, an elevator's buffer is found to be oil-type but undersized for the new higher contract speed. What must be done?

Accepted Answer

Replace the buffer with one rated for the new contract speed and stroke

Answer

Buffers must be rated for the actual contract speed; an undersized oil buffer cannot absorb the kinetic energy at the new speed.

Question 3

What is a primary electrical code requirement when new wiring is installed during an elevator modernization?

Accepted Answer

New wiring must comply with the NEC and ASME A17.1 in effect at the time of the permit

Answer

New electrical installations during modernization must comply with the NEC and the current edition of ASME A17.1 adopted by the authority having jurisdiction.

Question 4

A property owner wants to increase an elevator's speed from 100 FPM to 200 FPM during a modernization. Which component is most likely to require replacement due to this speed increase?

Accepted Answer

The governor

Answer

The governor must be replaced because its tripping speed is calibrated for the original contract speed, not the new higher speed.

Question 5

When a hydraulic elevator is converted from a two-speed AC motor to a VVVF pump unit, what operational benefit is achieved?

Accepted Answer

Smoother acceleration and deceleration with improved leveling accuracy

Answer

VVVF drives allow variable pump speed, producing smooth, precise car movement and accurate floor leveling compared to two-speed motor systems.

(CET) Certified Elevator Technician Practice Test

(CET) Certified Elevator Technician Practice Test

CET Modernization & Upgrades 3