In an industrial setting. 30amp 480volt Flexible Drop cords to supply power to machinery. These Cords must have Strain relief at the top. My question, must the twist lock plugs which are located 6' off the floor also have special strain relief built in? 400.10 in the 2002 NEC does not go into a lot of detail. What's your take? Thanks
Yes, that was my question. I did'nt think it would be an issue although I recalled seeing strain reliefs on the female plug in several factories. It may have been a policy within the factory or perhaps the local AHJ specified them.
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