Newbie, back gear questions

It is a good practice to use a double pole switch as a line (ON/OFF) switch in most any condition. Especially if the machine has a dual voltage motor. It is quite possible, especially for home grown electrical installations, to have the polarity reversed on the 120V socket. Or even back at the fuse panel. Remember, black is hot and white is neutral, theoretically at ground on 120 volt systems in the States. For 240 volt installations, in any country, a double pole is a given.

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