To all my fellow electrical types, I have also been on both sides of the fence, (Mechanic, Installer, Contractor, Engineer, Owner and State Inspector). I have been on jobs that the AHJ required or liked one connector/coupling over the other. I was also on one job that two journeymen got into a fist fight over this same issue. Both serve a purpose. So far no one has brought up: NEC 2008, Article 110.3 Examination, Identification, Installation, and Use of Equipment, (A) Examination. (B) Installation and Use. If the EMT connector/coupling is properly installed as listed you should not have any problems? I have been doing electrical work for 27 years, for me the use of these parts is based on: Environment, Time, Cost, Code Rules and also if I can make my local inspector feel good about the job. Compression fitting do cover more surface area. A ½” EMT connector/coupling, set screw has a No.10 set screw, this has a contact area of 0.02761” at one contact point. A ½” EMT compression fitting with an inside diameter of 0.7150” has two contact points on the bushing this contact area is 2.24624” x 2 = 4.49248”surface area. So if I was to use the EMT as a ground path as listed in Article 358.60, I think I would use a compression fitting. Just my opinion. Remember no fist fights.

Ozzie Woodcock