Detailed description of copper core cable capacity

First, the wire and cable about the flow-carrying instructions 1. flow-carrying: in the specified conditions (laying conditions; temperature conditions), the conductor can continuously carry (non-short-circuit) and does not cause its stable temperature (too high is burned) more than the specified value (insulator of the higher temperature) of the greater current. 2. insulation: attached to the outside of the copper-core cable materials, generally PVC (poly recording vinyl chloride), XLPE (crosslinked vinyl chloride), EPR (ethylene-propylene composite paste), mineral, etc. 3. General copper-core cable standard cross-section specifications (square mm): 0.3; 0.5; 0.75; 1; 1.5; 2.5; 4; 6; 10; 16; 25; 35; 50; 70; 95; 120. 2. General copper-core cable load capacity provisions based on the allowable core of the higher temperature, cooling conditions, laying conditions to be determined. Determined by the different conditions of the current-carrying capacity is completely different. Can be calculated according to the cross-section of the aluminum and copper core cable flow, but also according to the current to calculate the cable copper core aluminum core cross-sectional area. Third, the factors affecting the copper core cable flow-carrying factors 1. ambient temperature: the value of the ambient temperature is considered in the cable or conductor is not loaded with the temperature of the surrounding medium. 2. soil thermal resistivity: for buried cables in the ground, the actual soil thermal resistivity is higher than 2.5K.m / W place, you must appropriately reduce the amount of flow-carrying or will be immediately around the cable of soil to the more suitable materials to replace. 3. multiple Loop grouping: When more conductors or cables are installed in the same group, they must be multiplied by a specified correction factor. Group correction factor is calculated based on the assumption that the group of each circuit cable load is the same. 4. number of loaded wires: the number of wires to be considered in a circuit is the number of wires that carry the load current. In the multiphase circuit can be assumed that the conductor carries a balanced current, there is no need to consider the neutral line. 5. parallel wires: in the same phase of the system or the same pole in parallel with two or more wires, measures should be taken to ensure that the parallel wires average share of the load current. 6. along the route of the laying of the change in conditions: wiring path in the cooling conditions of the various parts of the path is not the same, the amount of flow-carrying should be suitable for the path to determine the most unfavorable conditions. 7. insulation: the number of conductors to be considered in a circuit is those that carry load current. 7. Insulation materials: different insulation materials have different current-carrying capacity, you can refer to the standard.

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