| 項目 |
英語 |
| C/N比 | carbon-nitrogen ratio |
| CAB | cable box |
| CAD | computer aided design |
| CAD/CAM | computer aided design、computer aided manufacturing |
| CAE | computer aided engineering |
| CAFM | Computer Aided Facility Management |
| CALS | Computer Aided Logistic Support |
| CAM | computer aided manufacturing |
| CASBEE | Comprehensive Assessment System for Building Environmental Efficiency |
| CATV | community antenna television system、cable television service |
| CAVユニット | constant air volume unit |
| CAV方式 | constant air volume system |
| CA冷蔵倉庫 | controlled atmosphere refrigerated warehouse |
| CB | circuit breaker |
| CB形キュービクル受電設備 | cubicletype unit substation with CB |
| CCD | charge coupled device |
| CCPケーブル | color coded polyethylene insulated cable |
| CCTV | closed circuit television |
| CCU | coronary care unit |
| CDM | clean development mechanism |
| CD管 | combine duct |
| CEC | co-efficient of energy consumption |
| CEC/AC | co-efficient of energy consumption for air conditioning |
| CEC/EV | co-efficient of energy consumption for elevator |
| CEC/HW | co-efficient of energy consumption for hot water supply |
| CEC/L | co-efficient of energy consumption for lighting |
| CEC/V | co-efficient of energy consumption for ventilation |
| CES | centralized extension system |
| CFC | chloro-fluoro-carbon |
| CFD | computational fuluid dynamics |
| CGI | common gateway interface |
| CGS | co-generation system |
| CIB | Conseil International du Bâtiment pour la Recherche、I"Etude et la Documentation |
| CIE | Commission International del" Eclairage |
| CIS | community information system |
| CMOSセンサー | CMOS sensor |
| CMマシン | commercial message machine |
| CO | carbon monoxide |
| COD | chemical oxygen demand |
| COP | coefficient of performance |
| COP3 | 3rd Conference of the Parties |
| CPC集熱器 | compound parabolic concentrator |
| CPEEケーブル | city pair polyethylene insulated and sheathed cable |
| CPEVケーブル | city pair polyethylene insulated PVC sheathed cable |
| CRT | cathode-ray tube |
| CS | communication satellite |
| CSR | Corporate Social Responsibility |
| CT | current transformer |
| CVCF | constant-voltage constant-frequency power supply unit |
| CVTケーブル | crosslinked polyethylene insulated PVC sheathed triplex type cable |
| CVV | PVC insulated PVC sheathed control cable |
| CV値 | CV value |
| CVケーブル | crosslinked polyethylene insulated PVC sheathed cable |
| CWV方式 | constant water volume system |
| Cx | commissioning |
| Cチャンネル | C shape channel |
| C火災 | class C fire |
| C級冷蔵倉庫 | class C refrigerated warehouse |
| C種接地工事 | class C grounding work（100 ohms and below） |
| C種絶縁 | class C insulation |
| C重油 | fuel oil C |
| C特性 | C scale |