A three-phase star configuration motor has:

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2

Answer 1

A three-phase star configuration motor has 3 hot, 1 neutral and 1 ground wires.
A typical office wall outlet has three electrical connections, which are the hot, neutral and ground wires.
All office equipment requires only the hot and neutral wires to function. The third or grounding wire is connected to exposed metal parts on the equipment.
Within the building, the grounding connections of all electrical receptacles are wired to one another and are connected to the water piping.
This ensures that all electrical equipment with exposed metal parts has these parts electrically connected and to exposed metal fixtures in the building such as water fixtures
The hot and neutral wires are interchangeable as far as the equipment is concerned. Both are power carrying wires.
One of the power carrying wires is grounded at the source for reasons of safety (the origin of the 3-wire system). The only reason why the two wires are differentiated (hot and neutral) is to identify which of the wires is grounded (neutral wire).
The 3-wire system is derived from three-phase distribution, which uses a 5-wire system. In the 5-wire system, there are 3 hot wires, 1 neutral wire, and 1 ground wire.