What OSHA regulation states that commercial vacuums need to have 3 prong cords?

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This is technically for safety reasons. The National Electric Code Section 406.4(D)(1) states that any grounding path must be grounded. Prevents of electrical shocks, fires, or malfunctions. Especially if being used outside or on wet surface areas.
 
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Don't have to be 3 prong. They just have to have UL certification for proper grounding cord size etc.
 

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