AC\DC
Senior Member
- Location
- Florence,Oregon,Lane
- Occupation
- EC
Taking courses on Solar energy International. Got a question wrong and don't know if I am right or they are here it is
I chose White or gray
The insulation on a functionally grounded conductor must be:
Select one:
white or gray
green or bare copper
red or black
any color except white, gray, or green
any color except white, gray, or green
Explanation
The National Electrical Code requires that equipment grounding conductors be green, green with a yellow stripe, or bare copper. It also requires that solidly grounded conductors, like the neutral wire on the AC side of a PV system, be white or gray. There are no Code required colors for ungrounded or functionally grounded conductors, so they can be any color except white, gray, or green.
MY RESPONSE
NEC article 100 defines the difference between functionally and solidly grounded. But it also has definition for -grounded conductors- and there is no definition for a functionally grounded conductor so grounded conductor covers both functional and solidly.
Grounded conductor article is 200 it does not state in that section that functional ground is not associated with this section. And article 690 also has no distinction.
So a functional grounded conductor is a ( grounded conductor ) and is dictated by article 200 so 200.7 applies for identification.
It can’t be colored green because that dictated in article 250.
But gray or white is what it should be labeled.
One could argue if we don’t consider this a grounded conductor per article 100 and there is no definition for this conductor. Then it may be what ever color you want, if the NEC does not define in an article a mandatory rule then it is up to installer to decide what to do.
I chose White or gray
The insulation on a functionally grounded conductor must be:
Select one:
white or gray
green or bare copper
red or black
any color except white, gray, or green
Feedback
Your answer is incorrect.any color except white, gray, or green
Explanation
The National Electrical Code requires that equipment grounding conductors be green, green with a yellow stripe, or bare copper. It also requires that solidly grounded conductors, like the neutral wire on the AC side of a PV system, be white or gray. There are no Code required colors for ungrounded or functionally grounded conductors, so they can be any color except white, gray, or green.
MY RESPONSE
NEC article 100 defines the difference between functionally and solidly grounded. But it also has definition for -grounded conductors- and there is no definition for a functionally grounded conductor so grounded conductor covers both functional and solidly.
Grounded conductor article is 200 it does not state in that section that functional ground is not associated with this section. And article 690 also has no distinction.
So a functional grounded conductor is a ( grounded conductor ) and is dictated by article 200 so 200.7 applies for identification.
It can’t be colored green because that dictated in article 250.
But gray or white is what it should be labeled.
One could argue if we don’t consider this a grounded conductor per article 100 and there is no definition for this conductor. Then it may be what ever color you want, if the NEC does not define in an article a mandatory rule then it is up to installer to decide what to do.
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