"WeChat users ask for help: how much cross-section of cable is needed for 220V power supply to power 15KW equipment?"
To be honest, the question is a bit vague and not very clear.
First of all, is the 15KW power the total power of the equipment or the power of a single device? If it is a single-phase equipment, such a large power is not easy to say, it will cause three-phase current imbalance, and the electrical industry will not allow you to install it like this.
In addition, there are many ways to install electrical equipment, not how to install it, but also to consider the distance of the installation equipment, whether the cable should be laid through the pipe and so on. The installation conditions are different, the wire diameter of the selected wire is also different, and the distance is too far to produce a voltage drop, resulting in the equipment can not be used normally. High ambient temperature or pipe laying will cause the current carrying capacity of the cable to decrease.
At the same time, the properties of electrical equipment are different, and the current is not the same, and the current of resistive load and inductive load should be calculated separately. For example, an electric furnace is a resistive load, 1KW≈4.5A, while an electric motor is an inductive load, 1KW≈6A. Therefore, the cable diameter to be selected is also different for different properties.
To sum up, is it okay to follow the total power of the equipment of 15KW?
To be honest, with such a large power, it is best to adopt a three-phase four-wire power supply, so that the three-phase load can be balanced, which is conducive to the power supply quality of the power grid.
1. Resistive load:
If the total power of the equipment is 15KW together, after the three-phase equalization, the average resistive load of each phase is 5KW, that is, 5×4.5=22.5A, aside from the long-distance power supply and high-temperature laying of pipes, it is enough to use 4mm2 copper wire for single phase.
2. Inductive load:
If it is a single-phase motor, calculated according to 1KW≈6A, the three-phase equalization is 5KW, that is, 5×6×0.8 (power factor) = 24A, and 6mm2 copper wire can be selected.
analysis
Why can't a single 15KW equipment?
The power of a single 15KW can be said to be rare, if it is an inductive load, the current can reach 72A, and if it is a resistive load, the current is 67.5A, and the minimum is 16mm2 copper wire, even for safety reasons, 25mm2 copper wire should be chosen.
In this case, the investment is too high, not to mention, it will mainly cause a serious imbalance of three-phase current, resulting in the overheating and burning of the main power supply live line, or the phenomenon of zero line being electrified, which seriously affects the quality of power supply and is not conducive to the safe operation of the power grid.
Disclaimer: This article is transferred from the Internet, the copyright belongs to the original author, if it involves the copyright of the work, please contact us to delete it in time, thank you