In the UK a residual current detector (RCD) would notice this and cut the power off but we run on 240 volts* (lethal) whereas most of America uses 120 volts (safer) so I would assume an RCD is not mandatory.
* 240 volts is one 'phase' of 415 volt 3 phase which is what most factories use. Commercial site powertools use 110 volts which is powered by a 'step down' transformer, this will give a nasty 'belt' if electrical problems occur but is rarely fatal.
We also have a way safer design of plug which is all down to one pioneering women. Who was an expert in home safety via being a member of electrical installations committee. Dame Caroline Harriet Haslett was a giant in the world of electrical engineering.