"Bonding" (?) of Boxes

[charlie b]

If I have a light switch installed in a metal "outlet box," with let us say three wires that allow it to perform its "lights-on, lights-off" function, do I also need to bring an EGC (or would it be called something else) to the location, to attach to the metal box? If so, where is the other end of that wire landed? Perhaps to the EGC that serves the nearest light fixture that is controlled by the switch?

Reason for question: I am reviewing a lighting design layout. They are using "tick marks" [I hate those] to show numbers and types of conductors. They show three ungrounded conductors to the switch, but no ground wire. I am not certain that one is needed, but I should think it would be needed.

 

[roger]

Charlie, does 404.9(B) cover your scenario?

Roger

 

[al hildenbrand]

If I have a light switch installed in a metal "outlet box," with let us say three wires that allow it to perform its "lights-on, lights-off" function, do I also need to bring an EGC (or would it be called something else) to the location, to attach to the metal box?

What is the wiring method. With this question, it sounds like it's a nonmetallic raceway, but, with a metal box. . .

If so, where is the other end of that wire landed? Perhaps to the EGC that serves the nearest light fixture that is controlled by the switch?

It may not be a wire. The EGC could be anything in 250.118.

 

[charlie b]

Roger: Yes that will answer my question.
Al: The specs are presently unclear (60% design stage) about whether metal conduit is required. But they do state that any PVC conduits will include a separate EGC.

Thanks to you both.