I have an electric shower which keeps blowing the fuse.IT is connected with 10mm wiring,to a pull cord of 45 amp fusage,then on to my fuse box,the fuse in it for shower is 30amps,it keeps blowing,it is a brand new shower.I just replaced it beacause old one kept bloing too,it is an 8.5 kw shower.

Hello jsimmons1

I fear you have your mm and KW ratings incorrect...

10 mm wiring? That is good for 200 Amps+
8.5 KW shower? That would require at 220 Volt around 39 Amps, and at 110 Volt 78 Amps.
As far as I know "electric" showers have capacities in the order of around 1 or 2 KW maximum.

Please check your data !

:>)

JS, how about starting by telling us what country you are in?

Sorry,I'm in uk,as far as I, know 10mm is fine for 8.5 kw shower,and 30 amp fuse sufficient,was wondering if fuse holder and cable going into it could be damaged,as fuse holder is a bit blackened