250.8 Termination of Grounding and Bonding Conductors.
The termination of equipment grounding and bonding conductors must be by exothermic welding, listed pressure connectors of the set screw or compression type, listed clamps, or other listed fittings. Sheet-metal screws cannot be used to connect grounding (earthing) or bonding conductors or connection devices to enclosures. Figure 250.42
The rule still doesn't prohibit drywall screws or wood screws from being used for this purpose, just a€śsheet-metala€ť screws!
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