Oklahoma Electrical Practice Exam

Wiring to an elevator or wheelchair lift door interlock conductor will be rated for what temperature?

1. Not below 150° C (302° F)

2. Not below 175° C (347° F)

3. Not below 200° C (392° F)

4. Not below 225° C (437° F)

The correct answer is: Not below 200° C (392° F)

Wiring to an elevator or wheelchair lift door interlock conductor is required to be rated for a minimum temperature of 200° C (392° F). This specification is crucial because elevator systems and wheelchair lifts may experience higher temperatures due to the operation of motors, the ambient environment, and the potential for heat generation during duty cycles. The 200° C rating ensures that the insulation material can withstand these conditions without degrading, which is vital for safety and reliability. If the wiring was rated for a lower temperature, there would be an increased risk of insulation failure, which could lead to short circuits, electrical fires, or malfunctions in the operation of the lift system. In practice, adhering to the correct temperature rating helps maintain the integrity and longevity of the electrical components used in these critical systems, ensuring they operate safely for users.