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The answer should be shown on the electrical appliance itself, often near where the cord enters, or near the main switch. If not, you can find it in the owner's manual. Different mowers have differently sized motors and other features that will determine the minimum amperage necessary.
Note that the longer cord you use, the larger the wires must be, as otherwise it will lose voltage due to the resistance and your lawnmower could be damaged by operating at the lower voltage.
What else can I help you with?
What size breaker do you need for a 40 gallon electric water heater?
Usually 30 amp
Can a 30 amp fuse replace a 40 amp fuse on a lawnmower?
You can replace a higher rating fuse with a lower rating provided it works with the device without constantly blowing. So try the 30 amp fuse in your lawnmower and if it doesn't blow and the mower works okay, you are fine. If it blows you will have to go back to 40.
What size wire for 72 amp motor?
You will need AWG #3 if it is a short run.
What size wire do you need to run 100 ft 75 amp 230 volt?
Depends on the size of the circuit which you did not list.
What size service do you need for 2 fifty AMP circuits?
Either #3 Copper or #2/0 Aluminum.
