What cable and automatic machines to use to connect electricity in the bath?
I want to get 5 kW of electricity from the shield on the street to the bathhouse. Distance 40 meters. SIP-4 cable, in the PND pipe. Please tell me the cable cross-section, how many lived and which machines to put on the street in the shield and at the entrance to the shield in the bath. Write in detail if possible to understand. I want to understand for my own safety. I will not connect it myself.
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Hello! The cable for any electrical installation is selected based on the current consumed by the load, the ambient temperature in which it will be laid, the number of cables in the pipe, etc. As already mentioned, the cable section is selected based on the current consumed. According to the table of permissible currents, for two aluminum cores when laying in a pipe (PUE-7 p.1.3.10-1.3.11 Permissible continuous currents for wires, cords and cables with rubber or plastic insulation) then for 5 kW, and this is 22, 7 Amperes, you need a cable with wires of at least 3 square meters. mm, but in the cross-sectional area of conductors of common cable products there is no such size, so we take the next - 4 sq. mm, according to the table it can withstand up to 28 A, which equals 6.16 kVA. You can use the following section, since the line is quite long. In addition, I could not find a SIP-4 cable with conductors with a cross section lower than 16 square meters. mm Therefore, you can use the cable brand AVVG or armored AVBBSHV.
There are no circuit breakers for such current, so we select the closest one, for example, 20 or 25A - it is used as an input automaton. In the bath, install the machine according to the current consumption by the load, but no more than the current of the input machine.