If the disconnect switch requires a key for activation, what must be true about the access key?

• A. It shall be removable while the switch is disconnected
• B. It shall not be removable while disconnected
• C. It shall be stored outside the facility
• D. It shall be duplicated and kept in multiple locations

Answer: (B)

Key-controlled isolation is used to enforce lockout and keep control of the disconnection point with authorized personnel. If the switch requires a key to activate, that access key must stay in place and not be removable while the switch is in the disconnected (off) position. Keeping the key in the switch or in a retained lockout device prevents someone from removing the key and re-energizing the system without proper authorization and procedure. If the key could be removed, it opens the door to bypassing the lockout, which is why storing the key outside the facility or duplicating it elsewhere would undermine safety and is not acceptable.