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when we r using 3.5 cable for a bldg. and put laod on each
phase using the neutral and neutral is the return paht for
the phase so the current of the neutral must be Ir+Ib+iY
(return).But the size of the netural is .5 as comper to the
phase.

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when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is ..

IN 3PH. NEUTRAL CARRIES ONLY UNBALANCE CURRENT MEANS IF ALL
PHASE ARE CARRYING SAME FOR EXAMPLE 20AMPS THEN CURRENT IN
NEUTRAL WILL BE ALMOST ZERO AMPS.

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when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is ..

3.5 c cable neutral is not the return path for the face but only that current which r unbalance among 3 phase, and that is sufficient to keep size 1\2 as compare to phase.

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