Which device restricts access to authorized personnel only?

Which device restricts access to authorized personnel only?

• A. Key Switch
• B. Access Card Reader
• C. Alarm System
• D. Coded Lock

Answer: (A)

Access to operate and service the escalator is controlled by devices that limit who can engage the control circuits. A key switch sits on the control panel and requires a physical key to enable operation. With the key, authorized personnel can switch the system into run or service modes; without it, the control circuit remains in a safe state, preventing unauthorized use. An access card reader restricts entry to the equipment area but doesn’t necessarily lock the actual control functions at the panel. An alarm system alerts to unauthorized access rather than preventing it, and a coded lock can be bypassed if codes are shared or guessed. The key switch provides a straightforward, verifiable way to restrict control to those with the proper key.

Access to operate and service the escalator is controlled by devices that limit who can engage the control circuits. A key switch sits on the control panel and requires a physical key to enable operation. With the key, authorized personnel can switch the system into run or service modes; without it, the control circuit remains in a safe state, preventing unauthorized use. An access card reader restricts entry to the equipment area but doesn’t necessarily lock the actual control functions at the panel. An alarm system alerts to unauthorized access rather than preventing it, and a coded lock can be bypassed if codes are shared or guessed. The key switch provides a straightforward, verifiable way to restrict control to those with the proper key.