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 430 — Motors, Motor Circuits, and Controllers

Answer

NEC Article 480 — Storage Batteries

Answer

NEC Article 517 — Health Care Facilities

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

Non-metallic sheathed cable (NM-B) stapled to hoistway concrete

Answer

Open wiring on porcelain insulators at 4-foot intervals

Answer

Armored cable (AC) stapled at 4-foot maximum intervals

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

Rigid metal conduit (RMC)

Answer

Electrical metallic tubing (EMT)

Answer

Metal wireways and auxiliary gutters

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

A 277V circuit shared with the machine room lighting to reduce wiring costs

Answer

A battery-backed emergency circuit providing only 90 minutes of illumination

Answer

Supplied from the same branch circuit as the car lighting

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

480V to permit use of standard building fluorescent fixtures

Answer

277V consistent with commercial branch circuit standards

Answer

24V for low-voltage safety compliance

Question 6

Per NEC 620.51, the main line disconnecting means for elevator equipment must be located:

Accepted Answer

In the machine room or machinery space, accessible only to qualified personnel

Answer

Inside the elevator car so occupants can shut off power in emergencies

Answer

At the building main service panel only, centralized for fire department access

Answer

In the pit to allow technicians to de-energize before pit entry

Question 7

When sizing elevator feeder conductors supplying multiple elevator motors per NEC 620.13, the ampacity must be based on:

Accepted Answer

125% of the largest motor nameplate current plus 100% of all remaining motor nameplate currents

Answer

The sum of all motor nameplate currents with no multiplier applied

Answer

200% of the total connected load to account for simultaneous starting

Answer

Only the highest demand motor, with other motors considered backup only