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Open delta high leg identification requirement

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    Open delta high leg identification requirement

    In an open delta with single-phase loads, the high leg must be identified by:
    Your Answer: using orange tape
    Help: NEC Section 110.15

    This was marked incorrect, but I do not understand how this is wrong after reviewing the NEC Section 110.15 It tells you to mark the high leg as orange.

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    Quote Originally Posted by Spanky123 View Post
    In an open delta with single-phase loads, the high leg must be identified by:
    Your Answer: using orange tape
    Help: NEC Section 110.15

    This was marked incorrect, but I do not understand how this is wrong after reviewing the NEC Section 110.15 It tells you to mark the high leg as orange.
    After reading NEC 110.15, it seems like the question is not accurate, as it talks about a 4 wire Delta system in which one winding is grounded in the middle and a neutral is landed at that point. This would not be an open delta system as Open delta is a 3 wire system with B phase grounded.

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    Quote Originally Posted by Kalbi_Rob View Post
    After reading NEC 110.15, it seems like the question is not accurate, as it talks about a 4 wire Delta system in which one winding is grounded in the middle and a neutral is landed at that point. This would not be an open delta system as Open delta is a 3 wire system with B phase grounded.
    Agree that this question should read 4-wire Delta system rather than open delta. As for the orange marking, 2015 edition states "orange in color or by other effective means."

    Not sure what the other options are but "other effective means" implies that markings other than orange are still acceptable. Pic related.

    Click image for larger version. 

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    Quote Originally Posted by SecondGen View Post
    Agree that this question should read 4-wire Delta system rather than open delta. As for the orange marking, 2015 edition states "orange in color or by other effective means."

    Not sure what the other options are but "other effective means" implies that markings other than orange are still acceptable. Pic related.

    Click image for larger version. 

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    In an open delta with single-phase loads, the high leg must be identified by:


    tagging or numbering

    using orange tape

    using violet tape

    any of the above


    Are we agreeing that the question is wrong ? it should be 3-Phase /4wire and Orange is the marking?

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    Quote Originally Posted by akumaleon View Post
    In an open delta with single-phase loads, the high leg must be identified by:


    tagging or numbering

    using orange tape

    using violet tape

    any of the above


    Are we agreeing that the question is wrong ? it should be 3-Phase /4wire and Orange is the marking?
    Per NEC 110.15 (2017) it should be 4-wire delta, marking can be orange or "other effective means." Seems like tagging, numbering, or using any other color not prohibited by NEC (such as green) would be allowed.

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