NEC标准对桥架电缆填充率计算的规定
725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits 727 Instrumentation Tray Cable: Type ITC 728 Fire-Resistive Cable Systems 750 Energy Management Systems 760 Fire Alarm Systems 770 Optical Fiber Cables ...
#178) 690.31(C)(2) Cable Tray. #179) 690.31(G) Over 1000 Volts DC. #180) 690.43(C) Equipment Grounding Conductor Location. #181) 695.6(D) Fire Pump Wiring. #182) 700.11 Wiring, Class-2-Powered Emergency Lighting ... #183) 700.12(H) Battery-Equipped Emergency Luminaires. #184) 700....
NEC 760.139 (A) Two or more PLFA Circuits. Power-limited fire alarm circuits, communications circuits or Class 3 circuits can be installed in the same cable enclosure, cable tray, raceway or cable routing assembly. NEC 760.139 (B) PLFA and Class 2 Circuits. Power-limited fire alarm circuits ...