~The Miele requires a 15 amp circuit.
MINIMUM is the missing word.
(Is there any other kind?)
Well, actually I believe general lighitng circuits may have been all of 10a in the WAY beginning of electricity.
20amp appliance circuits and 15a general lighting circuits are frequently used interchangably, from the end-user's point of view.
One exception is that a washer was 10a and a gas dryer 6a so that one needed a 20a circuit to handle it, (out of one duplex outlet and one circuit/line) rather than a 15a one.
Of course if you are a purist and paranoid and have a fuse box, you COULD put a 15a fuse on a dedicted DW circuit that has 20a wire. (But NOT the other way around). Make a note of it to reverse it later (in years), as needed.
If you have circuit-brekaers. Leave it alone!
The puropse, BTW, of grounding ("earthing") is that should there be a current/voltage leakage, it will run via the frame of the machine and the ground wire/conductor to the earth. A short-circuit like this would theoretically pull so much current that it will blow a fuse or trip the circuit breaker. This is preferable to having an ungrounded unit that will leak current through you (and yoru heart) killing ya, in that you, the person touching the machine who becomes the link to ground.
A GF(C)I (ground-fault [circuit] interruptor a/k/a a residual-current detector overseas) takes this one setp further, if current "out" doesn't equal current "in", there is a leakage to ground and the electronics shut-off the power before it can kill you.
oooh I'm rambling and pontificating again. Sorry. Thanks for the shout-out!
You should be just fine, as is. Go forth fearlessly and be fabulous.