SkillsUSA preliminary contest Industral Motors Controls Written test Q9

[fmtjfw]

In a building with 120/240V and 277V/480V services, if the 120V neutral is White, what color can the 277V neutral be?

Also Code References?

 

[don_resqcapt19]

This question has more than one correct answer based on the information in the question.

 

[fmtjfw]

This question has more than one correct answer based on the information in the question.

OK, which of the 5 possible answers are correct?

I guess you are speaking of large conductors, so that expands the list a little. If you had answered, say purple, I'd ask you where the white/gray supplemental marking was in the answer?

 

[Little Bill]

OK, which of the 5 possible answers are correct?

I guess you are speaking of large conductors, so that expands the list a little. If you had answered, say purple, I'd ask you where the white/gray supplemental marking was in the answer?

There could be two correct answers.

With some stipulations.

 

[fmtjfw]

There could be two correct answers.

With some stipulations.

Fine, What are the two answers?

There is a lot of overthinking going (as I would expect). These are High School Kids taking a 10 question MULTIPLE CHOICE test.

 

[Little Bill]

Fine, What are the two answers?

There is a lot of overthinking going (as I would expect). These are High School Kids taking a 10 question MULTIPLE CHOICE test.

White or gray, but with two different voltages they would have to be identified by voltages.

 

[don_resqcapt19]

White or gray, but with two different voltages they would have to be identified by voltages.

Not unless they are in the same raceway or enclosure, and that was the point of my post.

There is no requirement to identify the grounded conductors by system, unless you have grounded conductors from more than one system in a common enclosure.

As long as the question does not specify a common enclosure, both white and gray are correct answers.

 

[fmtjfw]

Not unless they are in the same raceway or enclosure, and that was the point of my post.

There is no requirement to identify the grounded conductors by system, unless you have grounded conductors from more than one system in a common enclosure.

As long as the question does not specify a common enclosure, both white and gray are correct answers.

OK -- got it.
Thanks.

 

[Little Bill]

Not unless they are in the same raceway or enclosure, and that was the point of my post.

There is no requirement to identify the grounded conductors by system, unless you have grounded conductors from more than one system in a common enclosure.

As long as the question does not specify a common enclosure, both white and gray are correct answers.

I guess I (wrongly) assumed the OP was talking about in the same inclosure.

 

[don_resqcapt19]

I guess I (wrongly) assumed the OP was talking about in the same inclosure.

That assumption is as good as mine...there was just not enough information to be sure of getting the correct answer.

 

[fmtjfw]

My Answer

My Answer

D

(9) In a building with 120/240V and 277V/480V services, if the 120V neutral is White, what color can the 277V neutral be?
According to 200.6(D) neutrals of different system must be distinguished from each other. 200.6(A) and (B) allow you to use White and Gray.
Code Ref:
200.6(A), (B), (D)
Index:
Color code ? Grounded conductor

 

[fmtjfw]

Revised question per input

Revised question per input

In a building with 120/240V and 277V/480V services where branch circuits from both are found in the same conduits, if the 120V neutral is White, what color can the 277V neutral be?

 

[Little Bill]

In a building with 120/240V and 277V/480V services where branch circuits from both are found in the same conduits, if the 120V neutral is White, what color can the 277V neutral be?

:thumbsup: