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My question is if I have a metal outlet box and equipment grounding conductors in the box, do I have to connect the EGC to the box using a listed green grounding screw?
Thanks for participating. No, the connection to the metal box should be made using one of the methods provided in 250.8. If a screw is used to accomplish this connection, it should be in accordance with 250.8(5) and be a machine screw that engages not less than two threads or is secured by a nut. No requirements for such screws to be green or listed. If the connection is made with a grounding clip (pressure connector), the clip would have to be listed.
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