Denis Caissie wrote:

What are the advantages of a 220V connection vs a 115V connection for power
tools?


Draws fewer amps on a given wire. Instead of say 15 amps @ 115V, the
load will draw 7.5 amps @ 220V, although it will draw it on two circuits
since to get 220 (actually 230) you would be using a pair of 115V circuits.