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Q: What color should be marked on a conductor for x3 on 480 v delta?
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A wild high leg should always be marked in what color?

NEC 230.56 Conductor with higher voltage to ground on a 4 wire delta service should be ORANGE in color. Use orange wire or mark with orange tape at the ends.


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What is the color assigned to the high leg conductor of a 4-wire delta secondary three phases?

Assuming you are talking about a 120/240v delta system the color coding is as follows. Phase A(120v)-Black Phase B(208v "Wild leg/High phase")-Orange Phase C(120v)-Blue There are other color coding methods but this is the most common.


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What is the meaning of any derivative instrument should be accounted for on a delta adjusted basis?

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Why there is no neutral conductor in power transmission lines?

Using a distribution system (e.g. 11 kV in the UK) as an example, the primary of a three-phase distribution transformer is delta-connected, which requires to be supplied by three line conductors. So a neutral conductor is superfluous.