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