28 30 00 Electronic Detection and Alarm 28 01 00 Operation and Maint. of Electronic Safety and Security 27 50 00 Distributed Communications and Monitoring Systems 10 71 00 Exterior Protection 28 00 00 Electronic Safety and Security 28 40 00 Electronic Monitoring and Control A01-00000 MISCELLANEOUS 01 50 00 Temporary Facilities and Controls 28 20 00 Electronic Surveillance 28 10 00 Electronic Access Control and Intrusion Detection / Surveillance