mounting switches and receptacles

[boatfull]

I know at one time I seen a code article regarding mounting switches and outlets, in boxes weather it be metal or plastic, having to use machine screws. Does that article exist?
Thanks

 

[rcarroll]

I don't see anything in articles 404 or 406 that require machined screws.

 

[resistance]

Never heard of it!
:?

 

[Gaffen99]

Metal to metal box grounding, but thats about it. The article just calls for metal screws.404.9B

 

[boatfull]

Guess I must have imagined it. Thanks all for the reply

 

[Dennis Alwon]

Guess I must have imagined it. Thanks all for the reply

Are you thinking of 250.8(A)(5) & (6) for grounding?

250.8 Connection of Grounding and Bonding Equipment.
(A) Permitted Methods. Equipment grounding conductors, grounding electrode conductors, and bonding jumpers shall be connected by one of the following means:
(1) Listed pressure connectors
(2) Terminal bars
(3) Pressure connectors listed as grounding and bonding
equipment
(4) Exothermic welding process
(5) Machine screw-type fasteners that engage not less than
two threads or are secured with a nut
(6) Thread-forming machine screws that engage not less
than two threads in the enclosure
(7) Connections that are part of a listed assembly
(8) Other listed means