Felt like doing some maths.
Single phase voltage is 230V with a 10% tolerance either way, so anything from 207V to 253V is acceptable.
So 25% of 60A = 15A.
So at the lowest acceptable voltage, the power will be 207V x 15A = 3.105 Kw.
At the highest acceptable voltage, the power will be 253V x 15A = 3.795 Kw.
It will be interesting to know how they calculated it to give a result of 4.6 Kw.
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