Answer Posted / prakash

A 3-phase 3-wire system does not contain a neutral. This
occurs when you have 3-phase loads such as motors that do
not require a neutral. A 3-phase 4-wire system has a
neutral. A neutral is required to obtain either 120 or 277
volts in a 3-phase system. Both of these scenarios can
occur on wye and delta systems.

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