You first need to calc tha current per phase
so 18500/230 = 80.4
80.4/3 = 26.8A
The Design Current is therefore 26.8A
So MCB is 32A
Assuming 1 cable and ambient temp of 30 and no insulation
Then cable(SWA) from tables is 4mm Voltage drop is 10.7 volts <5%
Anyone can check this I'm not betting my life on it
You first need to calc tha current per phase
so 18500/230 = 80.4
80.4/3 = 26.8A
The Design Current is therefore 26.8A
Not very well worded Sparkyspike
the oven is 18500W
so 18500/230 = 80.4A
3 Phases at 230V so
80.4 / 3 = 26.8A The circuit needs to be able to handle at least this.
Next nearest MCB is 32A so The cable needs to be able to handle 32A so selecting SWA 4mm should suffice.
But need to check V.Drop by calc this less than 5% assuming no insulation or grouping factors to consider
So 4mm SWA should suffice on a 32A Breaker!!!
Any better????
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