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According to the wording ,2 different phase wires "can" run through the same conduit.

Not only can they, but if they are part of the same circuit they must. And in cases where conductors are paralleled, meaning more than one conductor per phase as is common in commercial and industrial installations, you put one conductor of each phase and a neutral, if one exists, and a ground in each conduit. Not doing so, meaning to put all of one phase in one conduit, causes a voltage to be induced into the conduit and a tremendous amount of heat builds up. Even when using pvc or other non-metallic conduit, somewhere along the way you have something metallic and have the same problem.

To simplify, you must put all conductors associated with the same circuit in the same conduit.

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Q: Why 2 different phase wire are not supposed to pass through same conduit?
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