How are interlocks typically wired in elevator systems?

In elevator systems, interlocks are crucial safety devices designed to ensure that certain conditions are met before the elevator can operate. They are typically wired in series because this configuration allows for a fail-safe system where all conditions must be satisfied for the elevator to function.

When interlocks are wired in series, the current must pass through each interlock in sequence. If any one of the interlocks is not properly engaged—for instance, if a door is open or a safety condition hasn’t been met—the circuit is broken, and the elevator cannot operate. This series wiring ensures that the elevator will not move unless all relevant safety interlocks are activated, thereby enhancing user safety and reducing the risk of accidents.

In contrast, parallel wiring would allow the elevator to operate even if some interlocks are disengaged, which poses a safety risk. Open and closed circuit terminology relates to the flow of electrical current but does not directly describe the arrangement of interlocks in a way that ensures the necessary safety precautions are maintained. Thus, the series configuration is the most appropriate for interlocks in elevator systems.