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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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