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What is the difference between a fireproof bridge and a fireproof bridge?

What does 35KV cable package mean? That manufacturers can do, thank you

Answer:

Control cable or communication cable products have this data to provide, with the product model, structure, materials and so on. A data for reference: 1mm2 copper wire, 4-pin, each core DC resistance value of 18 ~ 19Ω / km, the capacitance between the two cores is about pF. A two-core four-terminal network simulation device as shown:
. is not laying the ground! . with galvanized pipe itself is the conductor, with PVC do not have to ground
At room temperature, the copper wire resistance coefficient k = 1/. aluminum k = 1/35 .. R = (L / S) * L * k where L is the length of the wire and S is the area of the conductor. Note: The relationship between resistance and temperature The magnitude of the resistance of the resistive element is generally temperature dependent and the physical quantity that measures the magnitude of the resistance value by the temperature is the temperature coefficient, which is defined as the change in the resistance value for every 1 ° C rise in temperature percentage.
Control cable or communication cable products have this data to provide, with the product model, structure, materials and so on. A data for reference: 1mm2 copper wire, 4-pin, each core DC resistance value of 18 ~ 19Ω / km, the capacitance between the two cores is about pF. A two-core four-terminal network simulation device as shown:

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