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In electrical cables what is U and U0 refers?

Answer Posted / sivasubramanian

U0 is the r.m.s. value between any insulated conductor and
earth , i.e. metal covering of the cable or the surrounding
medium;
U is the r.m.s. (root mean square voltage) value between
any two phased conductors of a multicore cable or of a
system of single core cables.

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