Is it necessary to change the AVVG cable 4x25 mm² with an increase in power by 9 kW?
The question is: is it necessary to change the aluminum cable AVVG 4 * 25, or is there enough power reserve. I looked at all the sites, got confused in these calculations, I hope for your help, thank you in advance ...
Well, on the question - in general, you need to know the length of the line, but according to the data you provided (25 mm² and an automatic machine at 63A) it is enough to answer - no, you do not need to change the cable, it must withstand such a load. A 25 mm² aluminum cable can withstand a current of about 65 A (table 1.3.5 of the PUE in chapter 1.3.) when laying in a pipe, and with an open laying, even more, up to 105A, but I repeat - the length is IMPORTANT here ...
But when you plug it in, measure the voltage drops at your end of the line with the consumers turned on and draw conclusions. In general, it seems to me that you are mistaken about 63A, the fact is that in a three-phase circuit 63A - this is about 41 kW, and you write that it is allowed 20. Either the power is limited by anything else, or you were mistaken. Therefore, more information is needed for a more correct and accurate answer.
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