What type of wire is specified for door locks in elevator systems?

The specification of fire wire for door locks in elevator systems is essential due to its ability to withstand high temperatures and potential fire conditions. Fire wire is designed to continue functioning even when exposed to flames or extreme heat, making it crucial for maintaining safety in elevator systems during emergencies. This type of wire is typically used in fire alarm systems and any equipment where the integrity of the wiring must be maintained in the event of a fire.

Using fire wire in door locks supports the overall safety and reliability of the elevator system, ensuring that emergency protocols can be effectively implemented without failure caused by wiring issues. In contrast, the other types of wiring mentioned may not provide the necessary fire resistance required for safety-critical applications like elevator door locks.