CET Traveling Cables & Wiring Methods 2

Question 1

Which NEC article specifically governs electrical wiring and equipment for elevators, dumbwaiters, escalators, and moving walks?

Accepted Answer

NEC Article 620 — Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Lifts

Answer

NEC Article 620 is the dedicated article covering all electrical requirements for vertical and horizontal transportation equipment including elevators, escalators, and moving walks.

Question 2

Per NEC Article 620, which wiring method is approved for use inside elevator hoistways?

Accepted Answer

Rigid metal conduit (RMC), intermediate metal conduit (IMC), or electrical metallic tubing (EMT)

Answer

NEC Article 620 requires conductors in hoistways to be installed in metal raceways such as RMC, IMC, or EMT to protect wiring from the mechanical hazards present in the hoistway environment.

Question 3

Which of the following wiring methods is NOT permitted in an elevator machine room per NEC Article 620?

Accepted Answer

Non-metallic sheathed cable (NM-B, commonly called Romex)

Answer

NEC Article 620 prohibits non-metallic sheathed cable in elevator machine rooms; only metallic raceways and other specifically permitted methods are allowed.

Question 4

Per NEC 620.24, the elevator pit lighting circuit must be:

Accepted Answer

A separate lighting circuit with a disconnect means accessible at the pit entrance

Answer

The pit must have a dedicated lighting circuit with a disconnect accessible at the pit entrance so technicians can control pit lighting before entry, ensuring they can see safely without depending on others.

Question 5

Per NEC 620.22, elevator car lighting circuits must not exceed which voltage rating?

Accepted Answer

120V to protect car occupants from high-voltage hazards

Answer

NEC 620.22 limits elevator car lighting to 120V maximum because the car is an occupied space, and lower voltage reduces shock hazard risk to passengers and technicians.

(CET) Certified Elevator Technician Practice Test

(CET) Certified Elevator Technician Practice Test

CET Traveling Cables & Wiring Methods 2