Yes, the proposal was sent in by an electrical inspector in Madison, Wisconsin and his substantiation indicated that sheet metal screws were unreliable when used to secure an equipment grounding conductor to the enclosure. The code uses the term "means provided" in many areas, when the rule covers the termination of the EGC. This "means provided" is usually a threaded hole, or other termination where "GR" or "GRND" will be engraved in the metal.
