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

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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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    For me it's a C2 because the cable could be overloaded if, e.g. the heater were inadvertently left running with the plug out. No fault to danger! My recommended remedy would be to downsize the MCB to 20 A. There should be no nuisance tripping given the intended use. (Or 25 A if RM C.)

    Chris, the heater is rated at 7.3kW 240 Volts and draws just over 30 Amps.

    433.1

    433.1.1.

     

    Z.

Reply
  • 0

     

    For me it's a C2 because the cable could be overloaded if, e.g. the heater were inadvertently left running with the plug out. No fault to danger! My recommended remedy would be to downsize the MCB to 20 A. There should be no nuisance tripping given the intended use. (Or 25 A if RM C.)

    Chris, the heater is rated at 7.3kW 240 Volts and draws just over 30 Amps.

    433.1

    433.1.1.

     

    Z.

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