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

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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.

Question Posted / mughauri

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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 ..

Answer / k.p.sharma

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 ..

Answer / saireen

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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