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

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.

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0 broadgage over 3 years ago

Whilst the 2.5mm cable will indeed do the job, Use of that size can not be recommended under any ordinary circumstances.
Even if use is intended to be intermittent, consider mechanical failure or human error or misuse that runs it for hours, on a hot day.
Consider later enclosing or boxing in of the cable, for neatness.
Consider replacement of the water heater with an 8 kw version “that must be OK as it is only very slightly larger”
Consider a short circuit after the cable has already exceeded its intended operating temperature.
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0 broadgage over 3 years ago

Whilst the 2.5mm cable will indeed do the job, Use of that size can not be recommended under any ordinary circumstances.
Even if use is intended to be intermittent, consider mechanical failure or human error or misuse that runs it for hours, on a hot day.
Consider later enclosing or boxing in of the cable, for neatness.
Consider replacement of the water heater with an 8 kw version “that must be OK as it is only very slightly larger”
Consider a short circuit after the cable has already exceeded its intended operating temperature.
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7,300 Watts supplied on a 2.5mm2 T&E.

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