CET Traveling Cables & Wiring Methods 3

Question 1

Per ASME A17.1, the minimum conductor size permitted for elevator power circuits is:

Accepted Answer

14 AWG, ensuring adequate current capacity and mechanical strength

Answer

22 AWG, consistent with low-voltage control circuit minimums

Answer

18 AWG, the standard minimum for fixture wiring

Answer

10 AWG, providing a conservative safety margin for motor loads

Question 2

When making terminations on elevator control panel wiring, which practice is NOT acceptable?

Accepted Answer

Twisting conductors together without a connector and wrapping with electrical tape

Answer

Using listed wire connectors appropriate for the conductor type and size

Answer

Using compression-type terminals properly sized for the wire gauge

Answer

Using screw terminals torqued to the manufacturer's specified values

Question 3

THWN-2 conductor insulation is rated for which maximum temperature in wet locations?

Accepted Answer

90°C in both wet and dry locations

Answer

60°C in dry locations only — not rated for wet locations

Answer

75°C in wet locations and 90°C in dry locations

Answer

105°C in all locations including continuous submersion

Question 4

Conductors from different systems (such as lighting, power, and signal circuits) installed in the same elevator wireway must:

Accepted Answer

Be separated by a metal barrier or otherwise comply with NEC requirements for system separation

Answer

Always be the same AWG gauge to prevent voltage differences

Answer

Have identical insulation color coding throughout the installation

Answer

All be grounded to a single common point within the wireway

Question 5

Per NEC 250.119, which color identifies the equipment grounding conductor in elevator wiring?

Accepted Answer

Green, green with yellow stripe, or bare copper

Answer

White or gray, consistent with neutral conductor identification

Answer

Orange, reserved for ungrounded conductors in high-leg delta systems

Answer

Blue, used universally for grounding in three-phase systems

Question 6

When replacing conductors in an existing elevator installation, the new conductors must:

Accepted Answer

Meet or exceed current applicable code requirements regardless of the original installation date

Answer

Match the original manufacturer's wire type and part number exactly

Answer

Be the same insulation color as the original wiring being replaced

Answer

Be installed using the original wiring methods even if those methods are now outdated

Question 7

Why are stranded conductors preferred over solid conductors in elevator installations?

Accepted Answer

Stranded conductors withstand repeated flexing and vibration without fatigue cracking

Answer

Stranded conductors have significantly lower electrical resistance per foot

Answer

Stranded conductors have higher current-carrying capacity for the same AWG size

Answer

Stranded conductors are simpler to terminate at control panel lug connections