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The inspector puts on his I am in a bad mood hat and makes the EC tap out the panel threads for 10/32 screws. Impat tools are for long screws into wood and not tightening machine threads to teh point of stripping out.
It po me just enough that I can make a contractor fix the panel threads and I have. The cover relies on 2 full threads of contact to ensure the cover is bonded and that the screw threads can keep the cover on in a fault. Strip out those threads and safety is compromised.
Many electric screwdriver/drills have tourque settings plently low enough you can spin in the screws but the clutch is light enough to stop before the screws are stripped.
Right tool for the job and an impact driver is not the correct tool for machine screws unless they are seized.
2 full threads of a 10-32 won't keep a cover on in a real fault