installing over-sink water heater

[Outtheway]

i am installing a redring 3kw over-sink water heater as a direct replacement for a old one, alls well with the fittings etc. but i want to make sure i fit the correct electric cable (type & size). The supply is 240v single phase AC. The instructions say 3 core flexible PVC 1.25mm min. The existing cable looks more like 2.5mm. Your advise would be very much appreciated!

[heathfield]

1.25mm cable is rated at 13 amps, with a maximum load capacity of 3.12kw. You might consider a 1.5mm cable with a 15amp rating and a maximum load of 3.6kw. 2.5mm cable provides for up to 4.8kw, and would be overkill.

[johnk]

If the 2.5 is already in it would be a waste of time replacing it unless it's in poor condition.

[ianmunt]

an earth leakage trip should also be in circuit

[Outtheway]

many thanks, heathfield, johnk & ianmunt for your help cable is in poor condition will look to replace with 1.5mm

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