I assume you're using "grounding" switches. You'll notice that one of the mounting screw holes has a piece of metal in it that rubs against the screw to ensure a good electrical bond between the switch and box. So as long as the switch is mounted in the box it should be grounded OK. Now I wouldn't be surprised if the latest NEC requires a separate ground wire, but I didn't use one in my shop when I wired it several years ago. I did run redundant ground wires through the conduit as you describe.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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