What cable section is needed to connect a 9 kW electric boiler?
Hello! In a house of 100 m2 it is planned to install an electric three-phase boiler of 9 kW. What cable section is needed to connect the boiler, and what cable section is needed for input from the meter (380) from the street to the house?
Hello! Three-phase consumer current is considered as follows:
9000 / (380 * 1.73) = 13.6A.
Then 2.5 mm² wires are more than enough. I don’t know what wire you need from the meter. That he 380 says nothing. You should at least indicate that a volt, not an ampere. See the value of the input machine and read the current using the same formula. If there are standard 15 kW, then at least 4 mm², you can 6 mm² (it will not be worse, but no longer needed).
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