Is 2.5mm cable enough for a 3kW device?

[diynige]

My electrician, during the house rewiring, has made provision for my immersion elements with 2.5mm cable. However, the cylinder is a megaflo and both immersion heaters (an economy 7 setup) are rated 3kW.

In the case of both daytime and nighttime supply there shouldn't be anything else on the circuit/cable supplying the element that will increase the load. Do I need to replace the 2.5mm cable with 4mm cable, or will the 2.5mm be sufficient?

All feedback is appreciated.
Cheers

 

[ban-all-sheds]

It will be fine.

http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

 

[wingcoax]

Electric fires are 3kw on smaller cable so you are more than ok.

 

[ColJack]

are you saying 2.5 for EACH element?
or 2.5 for BOTH elements??

 

[Taylortwocities]

There should be two separate feeds though one for each immersion.

From your post, one would be from the off peak and one on the normal (24hr) supply.

 

[diynige]

Yes, that's right, there will be two separate feeds, one for each immersion (one from the off-peak supply and one from the normal supply). So two 2.5mm cables, one for each element.

Thanks for all the replies, they've put my mind at rest.