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Some tools don't have ground wires because the tool exterior is plastic or some other material that will not conduct electricity. The ground is not required unless the case is metal and can become electrified if the "hot" wire touches it.

Sometimes the tool's plug is "polarized" by having one contact larger than the other so it can only be inserted into an outlet in one direction, insuring that the same wire is always the ground or neutral and the other is always the "hot" wire. That insures that the tool's ground is always connected to the outlet ground.

Other times the plug has a third prong that is the ground or neutral prong and can only be inserted one way in the outlet to insure the ground of the tool is always connected to the ground of the outlet.

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Q: Some tools dont have ground wire?
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