Which statement correctly distinguishes the primary power supply from a backup power source in gate systems?

• A. They are the same thing
• B. Primary power feeds normal operation; backup (battery or generator) provides continued operation during power outages with automatic switch-over
• C. Backup power feeds normal operation; primary power provides continued operation during outages
• D. Primary power is used only for lighting

Answer: (B)

The main idea is that the gate system runs on the primary power supply during normal operation, and a backup power source keeps the system running when the main power fails. The primary feed powers all aspects of the gate system—motorized movement, control electronics, sensors, and safety features—so everything operates as intended day to day. A backup power source, such as a battery or generator, sits ready to take over during an outage. The switchover is automatic, so if the main power drops, the system seamlessly continues to operate without requiring manual intervention. This arrangement is essential for reliability and safety, ensuring the gates can still function during power interruptions and that access control isn’t compromised.

If you consider the other ideas: primary power is not only for lighting but powers the whole system, so that option isn’t correct. Saying the backup powers normal operation would swap their roles, which isn’t how these systems are designed. And treating the primary as the same as the backup ignores the deliberate separation between the regular supply and the fail-safe reserve.