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220V 3 Wire vs. 4 Wire - 11 replies
I’m wiring a new shop and have a question regarding using 3 conductor vs. 4 conductor wire for the 220V circuits. Every 220V machine I have ever purchased (some recent) recommend using either a 3 prong twist lock or 3 prong spade plugs. Even new machines are recommending this type plug. I’m being told that the code is electrical c...