Traveling Cables & Wiring Methods Flashcards
7 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Traveling Cables & Wiring Methods flashcards as text
Per ASME A17.1, the minimum conductor size permitted for elevator power circuits is:
Answer: 14 AWG, ensuring adequate current capacity and mechanical strength
ASME A17.1 specifies No. 14 AWG as the minimum conductor size for elevator power circuits, balancing current-carrying capacity with mechanical durability in the hoistway environment.
When making terminations on elevator control panel wiring, which practice is NOT acceptable?
Answer: Twisting conductors together without a connector and wrapping with electrical tape
Bare twisted connections without proper connectors create high-resistance, unreliable joints that can cause intermittent faults, overheating, or fires — particularly dangerous in elevator control circuits.
THWN-2 conductor insulation is rated for which maximum temperature in wet locations?
Answer: 90°C in both wet and dry locations
THWN-2 insulation is rated for 90°C in both wet and dry locations; the '2' suffix specifically denotes this higher temperature rating compared to standard THWN rated at 75°C wet.
Conductors from different systems (such as lighting, power, and signal circuits) installed in the same elevator wireway must:
Answer: Be separated by a metal barrier or otherwise comply with NEC requirements for system separation
NEC Article 620 and ASME A17.1 require separation of conductors from different systems to prevent electrical interference, cross-talk, and safety hazards from mixing incompatible circuit types.
Per NEC 250.119, which color identifies the equipment grounding conductor in elevator wiring?
Answer: Green, green with yellow stripe, or bare copper
NEC 250.119 requires equipment grounding conductors to be green, green with yellow stripes, or bare copper — this standard applies uniformly across all NEC applications including elevators.
When replacing conductors in an existing elevator installation, the new conductors must:
Answer: Meet or exceed current applicable code requirements regardless of the original installation date
Replacement conductors must comply with current code requirements; the original installation date does not allow grandfathering of substandard replacement materials or methods.
Why are stranded conductors preferred over solid conductors in elevator installations?
Answer: Stranded conductors withstand repeated flexing and vibration without fatigue cracking
Stranded conductors consist of multiple small wires that distribute bending stress, allowing them to withstand the constant vibration and movement in elevator environments without the fatigue cracking that would quickly destroy solid conductors.