27 51 00 Distributed Audio-Video Communications Systems 27 53 00 Distributed Systems 27 00 00 Communications 28 30 00 Electronic Detection and Alarm 21 00 00 Fire Suppression 27 40 00 Audio-Video Communications 27 52 00 Healthcare Communications and Monitoring Systems 28 13 00 Access Control 27 11 00 Communications Equipment Room Fittings 27 13 00 Communications Backbone Cabling 27 15 00 Communications Horizontal Cabling 28 23 00 Video Surveillance 28 33 00 Gas Detection and Alarm 28 00 00 Electronic Safety and Security 28 31 00 Fire Detection and Alarm 28 10 00 Electronic Access Control and Intrusion Detection
CSI Codes : 21 00 00 Fire Suppression, 27 00 00 Communications, 27 11 00 Communications Equipment Room Fittings, 27 13 00 Communications Backbone Cabling, 27 15 00 Communications Horizontal Cabling, 27 40 00 Audio-Video Communications, 27 51 00 Distributed Audio-Video Communications Systems, 27 51 00 Distributed Audio-Video Communications Systems, 27 51 00 Distributed Audio-Video Communications Systems, 27 51 00 Distributed Audio-Video Communications Systems, 27 52 00 Healthcare Communications and Monitoring Systems, 27 53 00 Distributed Systems, 27 53 00 Distributed Systems, 28 00 00 Electronic Safety and Security, 28 10 00 Electronic Access Control and Intrusion Detection, 28 10 00 Electronic Access Control and Intrusion Detection, 28 13 00 Access Control, 28 23 00 Video Surveillance, 28 30 00 Electronic Detection and Alarm, 28 31 00 Fire Detection and Alarm, 28 31 00 Fire Detection and Alarm, 28 33 00 Gas Detection and Alarm
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