when is ground wire required

[dean ransome]

was wondering when it is required to run a ground wire in metal conduit because the conduit is not considered a ground.

 

[iwire]

The NEC rarely requires a 'ground wire' in metal conduit.

Job specifications or local amendments might.

 

[bphgravity]

See 250.118 to make sure your metallic raceway qualifies for an equipment ground. And don't forget about specific rules for special occupanices and equipment like in health care facilities...

 

[iwire]

And don't forget about specific rules for special occupanices and equipment like in health care facilities...

Health care was the only application I could think of that the NEC requires a redundant EGC.

Anyone know any others?

 

[charlie b]

I once heard, but cannot now confirm, that the city of Chicago had in their amendments the requirement that an EGC be pulled inside conduit, even if the conduit were metal. In any event, local codes may have that requirement.

 

[ron]

I don't work with pools or Jacuzzis, but I think I remembered an application when the conduit was metallic and required a dedicated EGC.

 

[ryan_618]

I'm trying to remember, but it seems there was a 2008 accepted proposal to assembly that was similiar to this. I am not 100% on that, however.

 

[petersonra]

hazardous areas?

 

[dsteves]

Perhaps in the instance where an isolated ground is required or specified?

Dan

 

[matt n.]

Flexible Metallic Conduit, Liquidtight Flexible Metal conduit, and Flexible Metallic Tubing all require a ground wire if there combined length is over 6' or they are used where flexibility is required after installation. Like at a motor or drop in light. Also patient care areas in health care facilities require redundant grounding

 

[infinity]

Flexible Metallic Conduit, Liquidtight Flexible Metal conduit, and Flexible Metallic Tubing all require a ground wire if there combined length is over 6' or they are used where flexibility is required after installation. Like at a motor or drop in light. Also patient care areas in health care facilities require redundant grounding

Is one required for a lay-in style troffer fixture?