Floating 220V electrical box

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My shop is wired for 220V but I’ve never used anything other that 110V until this year. All my recepticals, including the new 220V, are metal surface mounts. All the 110V recepticals have the body of the device connected to the ground. The 220 receptical has the ground floating from the receptical body. That means my 220 electrical box is floating. Is this OK or should I connect the box to ground?

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cbxjeff 2020-05-16T14:08:46-04:00 3 Answers 201 views
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  1. Dominick Amorosso
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    2020-05-16T16:03:12-04:00
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    Every outlet, every box should be grounded. By the way. It’s 120 volt and 240 volt. Just so you know. But everyone calls it 220.

  2. cbxjeff
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    2020-05-16T16:29:14-04:00
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    Thanks for the reply. Am I correct in saying that I should add a wire from the ground lug of the 240V receptical to the electrical box where the 120V boxes are grounded by the design of the receptical itself?

  3. Dominick Amorosso
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    2020-05-16T20:06:14-04:00
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    Not really. The ground for any 220/240 should be of the same size wire. So it would really depend on if the other outlets are 15 or 20 amp. All of your 220/240 wires should go right to the panel and not use or trust any other wires.