Current carrying capacity calculation | Formula for calculating the current carrying capacity of wires

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How to calculate the current carrying capacity of a cable?

1. Comparison table of three-phase cable current carrying capacity is as follows:

2. Calculation method of three-phase cable current carrying capacity:

1. According to the calculation formula of three-phase electric phase line current: I=P ÷ (U × 1.732 × cos Φ), where P - power (W);

1. Radiation cross-linked power cables (voltage level: 0.6/1KV; execution standard: GB/T12706.1-2002) 2. Medium voltage cross-linked polyethylene insulated power cables (voltage level: 6/6KV-26/35KV; Execution standard: GB/T12706.2-2002) 3. High voltage cross-linked polyethylene insulated power cables with caution (voltage level: 64/110KV, execution standard: GB/T 11017-2002; 127/220KV, 290/500KV) 4. Control cables (comply with standard: GB9330-88; Voltage level: 450/750V) 5. Computer cable (voltage level: 0.45/0.75KV, enterprise standard) 6 Overhead insulated cables (voltage levels: 0.6/1KV, 8.7/15KV, 26/35KV; Execution standard: Multiple) 7 Aluminum stranded wire and steel core aluminum stranded wire (voltage level: 0.6/1KV; execution standard: GB/T 1179-1999) 8. Fire resistant cable (voltage level: 0.45/0.7

5, 0.6/1KV; Execution standards: GB/T 19666-2005, GB/T12706.1-2002) 9. Low smoke halogen-

2. Three phase cable current carrying capacity comparison table, how to calculate it?

The comparison table of three-phase cable current carrying capacity is as follows

1. According to the calculation formula of three-phase electric phase line current, I=P ÷ (U × 1.732 × cos Φ) - P: power (W) - U: voltage (380V) - cos Φ: power factor (0.85) - I: phase line current (A). Input data: motor power P=7.5kw, voltage Shen Sou U=380V; According to the calculation, the phase line current I=13.3A2. In a three-phase balanced circuit, the current carrying capacity of a typical copper wire is 5-8A/mm ^ 2. 13.3 ÷ 8=1.66mm ^ 2, the latest specification of the cable is 2.5mm ^ 2. Additional information: - Purpose of cable current carrying capacity: The cable is used to transmit electrical energy, and the three-phase power calculation formula is P=1.732UIcos φ. -The maximum allowable current carrying capacity for each specification of wire is specified in national regulations. When in use, the maximum load current required by the chain load must be less than the long-term allowable current carrying capacity of the wire in the air. For example, a 25 square millimeter copper core wire has a long-term allowable current carrying capacity of 105A in air. When the main equipment is running, the operating current should be small and equal to or greater than 105A.

3. Calculation formula for wire current carrying capacity

The cable current carrying c

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