How to connect three nichrome spirals to increase power?

Sergey asks:
There are three spirals of 5 kW each. If we connect them with a triangle
with a voltage of 380 volts, then in total you get a power of 15 kW?
The answer to the question:
5 kW at what voltage? Not the fact that they will work fine. Power is not all the necessary characteristics for an answer, they are designed for some kind of rated voltage. If on 220V - then you need to connect with a star, and then yes, there will be 15 kW, if at 380 - a triangle, and the answer too - yes, it will.

Why do you want a triangle?

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