These are not suitable for industrial fan plugs. I also cannot return an item through a UPS store as the nearest store is more than two hours away in either direction. So I think I'm stuck with a product I can't use. First time for Revain and I've been a regular customer since I worked at BNA5 (and flex rider at BNA1). They are suitable for Christmas tree lighting but twice the size required for grounding plugs. Someone in the DC where these houses are should contact the troubleshooter to tellβ¦