Only if it has holes to fit a padlock in the off position.
These will allow between 7.2kW and 7.7kW, if we are generous and allow 240V
for our calculations. The shower is 8.4kW. I'd go with a 40A/30mA Type B
RCBO. The thought of having an instananeous shower on a rewirable fuse with
no RCD makes my spine shudder (and will probably make your's shudder pretty
uncontrollably in the event of an earth fault).
I haven't got the tables in front to check the cable's suitability. 6mm
seems marginal and certainly needs to be calculated properly to be sure it
Bearing in mind the duty cycle of an electric shower, wouldn't the
overloading be tolerable, in practice? I know of at least one
installation with an 8.5 kW shower on a 32A breaker.
If the OP is using a former cooker circuit, he might be well advised
to move it to the RCD protected side of his CU.
Also, he isn't running his new oven from the 13A outlet on the cooker
switch, is he?
I'd be amazed if it didn't work, I have to say. I don't have the curves in
front of me, but suspect a 10% overload would take tens of minutes to blow,
if ever. It would still be very bad practice, though.
I agree it would probably work but it's the kind of practice reserved for
qualified sparkies houses - you know like decorators houses always need
painting and plumbers houses still have lead piping etc. etc. ;-)
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