For on-off of any inductive load like an electric motor the current wants to continue to flow as you break the connection. This results in a spark between the previous connected conductors. If the spark is intense enough, i.e. hot enough you will ionize the air and current will flow through the ionized air. Motor starters are designed with this in mind and break connections quickly and with larger distances than switches. So for long life use a motor starter, for less life use a contactor, for almost no life use a Double Pole Single Throw switch, for almost zero life use a Single Pole Single Throw switch.
The cheapest solution is a 220 volt socket and a mating 220 volt plug. Start the motor by forcefully plugging the plug into the socket. Stop the motor with a forceful quick jerk of the plug. The quick jerk gives a large distance for the spark arc and it will quickly extinguish. Sometime cheap is not the way to go.
It's a good thing you know I'm serious , or I mean joking. What are you building . Come on give it up , sketches, diagrams, big explainations and alot of hand waving. Why the 1.5 horsepower motor? isn't that a little large for a homeade setup? Scott
well one reason for using the 1.5 hp motor is --- I got one in stock from some drug deal of a past life I have too many folks that think my contraptions - while still dealing with solid fuel - since its not hard, shiny, delivered wet, and a black material of color --- is shouldn't be chatted about here - so I lurk
Last edited by Richard S. on Mon Dec 16, 2013 8:10 am, edited 1 time in total. Reason:<removed dead image link>