Which introductory machine to choose for SIP 4 * 50 cable
Hello. Help is needed. The situation is as follows: the owner promised tenants a capacity of 120 kW. A SIP 4 * 50 cable enters the building. It is laid along the wall of the neighboring building and through the air only about 50 m. Please tell me which input circuit breaker should be installed to protect this cable and what real capacity can tenants expect?
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Hello! Rated current of a cable with a section of 50 sq. mm - 145 A per phase. The closest rating of the machine is 125 A. That is, for a phase of 27.5 kW for a purely active load, the total load is 82.5 kW.
If the load is not purely active - for example, electric motors, then in this case it all depends on cos - consumers. For example, if cosφ is 0.8, then in this case the power will not be 82.5 kW, but 66 kW - this is if the motor windings are connected to a star. Also, if electric motors will be powered, then it is necessary to take into account their starting currents, which significantly exceed the nominal ones - that is, the load that this line can feed will be even less.