Side By Side Refrigerator,Side By Side Fridge,Side By Side Refrigerator With Ice Maker,Side By Side Fridge Freezer Guangzhou wanbao group refrigerator Co. Ltd. , https://www.wanbao-refrigerator.com
The Standardization Technical Committee of Electrical Installations of Buildings and the International Copper Association are now compliant with the IEC60364-5-523 standard for copper-cored cable and cable current-carrying capacity and provide reference for design, production, construction and installation, quality inspection, operation and management. In 1995, the International Electrotechnical Commission began to revise the ampacity standards for the 1983 edition and it has now entered the final approval stage. After a detailed comparison of the two, the following circumstances and changes have been told to the reader:
1. The applicable voltage range is changed to AC 1KV and DC 1.5KV.
2. The current carrying capacity of copper wire 1.0mm2 and aluminum core 1.0mm2, 1.5mm2 was deleted.
3. There is basically no change in the current carrying capacity, and individual variations do not exceed 7%.
4. There is no change in the cable wire type and temperature rise limit.
5. Increase the correction coefficient when the soil thermal resistance is not 2.5Km/W.
6. The textual description of the cable wiring in the table is changed to diagram.
7. Table 52-E4, E5 cancel the non-porous tray's current-carrying capacity data.
8. The following changes have been made to 523.5:
(1). 4-phase and 5-core cables can have larger current-carrying capacity only when the three-phase conductors have load current and balance;
(2) When the three-phase load is unbalanced, the temperature rise caused by the neutral current will be offset by the reduced heating of the line current. In this case, the conductor cross section should be selected according to the maximum phase current;
(3) When there is a load current at the neutral line, and the phase current does not reduce accordingly, the neutral harmonic current is greater than 10%, and the neutral section should not be less than the phase section. See Appendix C for the larger harmonic current correction factor.
9. Increase the requirements for the parallel conductor to reach the load current distribution balance. Cable current-carrying standards and cheat sheet:
Single core current carrying capacity (25°C) (A) Two-core current carrying capacity (25°C) (A) Three-core current carrying capacity (25°C) (A) Four-core current carrying capacity (25°C(A) VV YJV VV YJV VV YJV VV YJV 1.5mm2 20 25 16 16 13 18 13 13 2.5mm2 28 35 23 35 18 22 18 30 4mm 2 38 50 34 38 23 34 28 40 6mm 2 48 60 40 55 32 40 35 55 10mm 2 65 85 55 75 45 55 48 80 16mm2 90 110 70 108 60 75 65 65 25mm2 115 150 100 140 80 100 86 105 35mm2 145 180 125 175 105 130 108 130 50mm2 170 230 145 210 130 160 138 165 70mm2 220 285 190 265 165 210 175 210 95mm2 260 350 230 330 200 260 260 260 120 mm2 300 410 270 410 235 300 255 300 150mm2 350 480 310 470 275 350 340 360 185mm2 410 540 360 570 320 410 400 415 240mm2 480 640 430 650 390 485 470 495 300mm2 560 740 500 700 450 560 500 580 400mm2 650 880 600 820 500mm2 750 1000 630mm2 880 1100 800mm2 1100 1300 1000mm2 1300 1400
Wire and cable current-carrying standards and checklist
The cable current-carrying standards and the cactus table copper-core wire and cable current-carrying capacity standards were translated from section 523 ampacity of the fifth part of the electrical installations of the International Electrotechnical Commission. The standard number is IEC60364-5-523 in 1983. Since the reform and opening up, public utilities and housing construction have developed rapidly, and household electrical equipment and other electrical equipment have increased. However, it cannot be overlooked that in the fires that occur every year, electrical fires also show an upward trend. In a few short years, the proportion of electrical fires has more than doubled, and a considerable part of this has been caused by faults in the insulation of cables and cables, overheated spontaneous combustion, poor contact, single-phase grounding of cables, and short-circuits between phases. Therefore, how to use cables and wires scientifically and reasonably, and accurately select the current carrying capacity of cables and cables, and comply with the norms for management and maintenance, is crucial. As there is no national standard for cable and wire current carrying capacity below 1000V, and the most extensive use of this part of cable and wire, in view of this, the National Building Electrical Installation Standardization Technical Committee has proposed the preparation of a standard plan to report the national technology. The Bureau of Supervision supervised the adoption of the International Electrotechnical Commission's IEC 60364-5-523 standard as a national standard (China's cable and wire comply with the IEC cable and cable manufacturing standards).