The Medway Handyman presented the following explanation :
If an appliance is plugged into an extension lead, and the lead is plugged
into a socket outlet - will a fault in the appliance blow (a) the fuse in its
own lead, (b) the fuse in the extension lead or (c) both?

If both are the same value of fuse, either or both could blow -
assuming the washing machine is the only load on the extension.
Normally an MCB would be the first to trip.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk