In card access, a portion of the identifying characteristic of an access credential that is common to a group of users in secured facility.

An electric lock that automatically unlocks with any power interruptions.

An electric lock that requires power to unlock.

A door that has been certified as a fire and smoke barrier. Special rules govern fire doors, including permissible hardware that can be installed.

A relay or switch mechanism that contains three terminals (normally open, common, and normally closed).