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7,300 Watts supplied on a 2.5mm2 T&E.

Zoomup

Yes a 2.5mm2 T&E cable can supply a 7,300 Watt instantaneous water heater at 240 Volts. I came across this today. The supply was from a B32 M.C.B. So why do we use bigger cable than 2.5mm2 if it will do the job?

The run was about 5m maximum. 

Z.

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    AJJewsbury: 
     

    533.2.1 3rd paragraph is concerned with choosing the values of In and I2 surely.

    Read it again… ".. based on values of Ib and Iz for the thermally equivalent constant load".

       - Andy.

    I have read it several times. It assumes a constant load with no consideration of duty cycles as my previous observations mentioned.

     

    Z.

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