Urgently needed: For a capacity of 667 kW at 380 V, what size cable and what rating circuit breaker should be used?
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For the distribution cabinet, the design institute specified 2 cables of 240 amperes; I don’t think that’s correct. The design institute specified circuit breakers with a capacity of 1000 amps. I believe 2 cables of 300 amperes each would be appropriate. What should be the capacity of the circuit breakers? I need the help of experts, urgently! ! !
From personal experience, the cable heating was a real problem; we resolved it by cutting the cable and switching to a weather-resistant copper busbar system. . .
I’m sorry, I misread it; I thought it was a single device
1. I’m not aware of the length of your power supply cable; based on the distance, at least 3 pieces of 240V cable should be connected in parallel. 2. The circuit breaker is too small; at least a 1600A model should be chosen. According to the data provided by this design institute, accidents are likely to occur under full load.
For this marine customer with a load of 667 KW, it is necessary to consider the nature of the load as well as its simultaneous coefficient (the coefficient required according to design specifications) in order to determine the rated capacity of the automatic switch； At the same time, the breaking current of the 380V busbar is calculated based on the capacity of the power distribution system and the power distribution transformers, so as to determine what value in KA the breaking current of the circuit breaker should be. Too little information is provided to make an accurate calculation. If I were to give it to you, it might mislead you! At the same time, the choice of cable also depends on your company’s requirements regarding busbar voltage drop; a voltage drop range of 5% to 10% has a significant impact on the selection of cable size.