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How much current can 220 V 0.5 square line bear If it's 0.75 square millimeter, what's their formula
It has nothing to do with how many volts, it's a withstand voltage problem
The current is only related to the cross-sectional area of the wire, and different current densities are selected according to different wiring modes and wires
The unit of current density is a / mm2 (ampere / square millimeter). Generally, 10a / mm2 can be selected for overhead line. For surface laying, such as indoor wiring, 5A / mm2 can be selected. For dark line, such as threading in the pipe, 3A / mm2 can be selected. These are only for reference. Please refer to the national standard for details
The higher the current density is, the higher the heat will be. This is related to the wiring mode. Moreover, this number is not a fixed value, but is artificially selected. Therefore, how much current can be withstood is mainly to bear safely, rather than to burn out as the bearing value when the overcurrent is like insurance
In calculation, the current can be obtained by multiplying the cross-sectional area by the current density
If it is laid on the surface of open wire, 0.5 square wire can carry 550W load under 2.5A, 220V environment; 0.75 square wire is 3.75a
How much current can the 220 V 3 * 0.75 square line bear?
3 * 0.75 control cable with outer sheath for home lighting,
3 * 0.75mm ^ 2 wire is aluminum core, which can withstand current of 3.5A
3 * 0.75mm ^ 2 wire is copper core, which can withstand current 5A
How to calculate the rated current of the cable is to know the cross-sectional area of the cable and how to determine its current carrying capacity
Is there a simple calculation formula? There are too many parameters in the standard, and I have a lot of wealth. If I can answer the questions, I will add 50
Man, what I want is a formula. I know the answer of iec287 standard or the corresponding national standard. I also have that formula, but I don't know how to obtain the internal parameters such as thermal resistance. If you can tell me all the parameters of thermal resistance, it's OK to add 100 points. I can see what I know at a glance
Current carrying capacity of 0.6/1kv ～ 3.6/6kv PVC insulated and sheathed power cables (VV Series)
Cross section (mm2) laying in air
\X05 one core, X05 two core, X05 three core, X05 four core, x056kv three core, X05 one core, X05 two core, X05 three core, X05 four core, x0566kv three core
\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1\x05G1\x05A1
1.5\x0524\x05\x0520\x05\x0517\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05
2.5\x0532\x0525\x0528\x0521\x0528\x0518\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05
4\x0545\x0534\x0536\x0529\x0531\x0524\x0528\x0522\x05\x05\x05\x05\x0545\x0535\x0538\x0529\x0536\x0527\x05\x05
6\x0556\x0543\x0547\x0536\x0539\x0531\x0533\x0528\x05\x05\x05\x05\x0556\x0543\x0547\x0537\x0546\x0536\x05\x05
10\x0580\x0561\x0566\x0561\x0556\x0543\x0551\x0540\x0560\x0547\x05101\x0578\x0577\x0559\x0565\x0550\x0561\x0547\x0561\x0546
16\x05106\x0586\x0589\x0569\x0576\x0559\x0566\x0553\x0581\x0561\x05132\x05104\x05102\x0579\x0587\x0566\x0581\x0562\x0580\x0561
25\x05143\x05111\x05117\x0591\x05102\x0578\x0592\x0571\x05105\x0581\x05175\x05132\x05125\x0597\x05109\x0584\x05106\x0582\x05104\x0579
35\x05175\x05133\x05143\x05111\x05122\x0594\x05115\x0589\x05127\x0599\x05212\x05164\x05148\x05115\x05130\x05100\x05134\x05108\x05128\x0599
50\x05228\x05170\x05180\x05138\x05154\x05122\x05144\x05111\x05159\x05122\x05280\x05201\x05181\x05140\x05160\x05128\x05168\x05125\x05157\x05121
70\x05285\x05207\x05217\x05170\x05191\x05146\x05178\x05136\x05191\x05148\x05307\x05288\x05220\x05170\x05195\x05150\x05196\x05151\x05188\x05144
95\x05324\x05254\x05\x05\x05266\x05180\x05208\x05168\x05289\x05188\x05371\x05288\x05\x05\x05229\x05176\x05234\x05181\x05228\x05174
120\x05382\x05297\x05\x05\x05270\x05207\x05258\x05195\x05275\x05212\x05424\x05339\x05\x05\x05262\x05201\x05267\x05206\x05258\x05198
150\x05445\x05339\x05\x05\x05313\x05244\x05297\x05228\x05313\x05244\x05488\x05375\x05\x05\x05299\x05229\x05301\x05281\x05295\x05226
185\x05519\x05392\x05\x05\x05360\x05281\x05344\x05288\x05360\x05281\x05541\x05419\x05\x05\x05334\x05259\x05338\x05281\x05331\x05256
240\x05609\x05472\x05\x05\x05429\x05334\x05\x05\x05429\x05334\x05686\x05498\x05\x05\x05383\x05298\x05\x05\x05381\x05295
How much is the copper wire of 70 square millimeter per meter
0.623kg/m
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