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C-class flame retardant copper core PVC insulated wire before ZR is now divided into ABC three grades of standards: According to the national standard GB / T-2005 "Flame retardant and fire-resistant wire and cable general"
"GB-1994 Code for Design of Electric Power Cables" 3.3 Cable Insulation Level 3.3.1 The rated voltage of the cable core of the power cable in the AC system is not lower than the working line voltage of the circuit. The selection of the rated voltage between the cable and the insulation or metal sleeve of the power cable in the AC system shall meet the following requirements: Neutral point direct grounding or low impedance grounding system When the earthing protection action does not exceed 1 min, Should be used 100% of the working phase voltage of the circuit. for the of the power supply system, should not be less than 133% of the use of circuit work voltage; in a single ground fault may last more than 8h, or generator circuit and other high security requirements, should take 173 % Of the working phase voltage using the loop. 3.3.3 AC system cable impact voltage level, should meet the system with the requirements of insulation. 3.3.4 DC power transmission cable insulation level, should be included in the load changes factors to meet the internal over-voltage requirements. For the situation mentioned by the landlord, such as the use of the gap control is used in the voltage level of 450/750 KVV4X1.5 control cable, such as long-term power supply, you should use the rated voltage of 0.6 / 1KV VV4X1.5 power cable.
Up to the upstairs According to the national standard GB / T-2005 "flame retardant and fire-resistant wire and cable general" 4.4 product representation; ZC-BV name should be called: copper core PVC insulated flame retardant C fixed wiring wire The Common specifications are: rated voltage 300 / 500V (0.75 ~ 1.0mm?) national machinery industry standard JB / T8734.2-. rated voltage 450 / 750V (1.5 ~ 400mm?) equipment with wire and cable national standard GB / T5023.3-2008 "Rated voltage 450 / 750V and below PVC insulated cable"; Thank you for adoption! Our company is specialized in manufacturing wire and cable, absolutely correct.
