Ungrounded conductor identification

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I thought that the rule for the grounded conductor (200.6(a)) also applied to the ungrounded conductor, but I can't find it.
Only ungrounded I’m aware of having to be identified is the “high-leg” of a delta 240/120 3ph system. Which has to be identified orange.
 
I assume you mean colors of ungrounded conductors., no. Except orange.

Welcome aboard!
 
200.6(A) is the rule that says, in general, that you cannot re-identify a conductor 6AWG and smaller as a grounded conductor. This requires that the grounded conductor have white or gray insulation. There is no similar rule for the re-identification of ungrounded conductors. Where ungrounded conductors are being identified by choice or to comply with a rule like the one in 210.5(C), you can use any identification method you choose, including markings on the conductors to re-identify it.
 
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