The neutral point refers to a point in an electrical circuit that is at zero voltage relative to ground. Some key points about the neutral point:
• It is common to all the current-carrying conductors in the circuit. So no voltage exists between the neutral point and any of the current-carrying wires.
• It provides a reference point for determining voltages in the circuit. The voltage of any point in the circuit can be determined by measuring its voltage with respect to the neutral point.
• It allows connecting electrical devices that require three terminals - live, neutral and earth. The neutral terminal is connected to the neutral point in the circuit.
• In AC power circuits, the neutral point oscillates at the same frequency as the AC voltage but with an amplitude of zero volts. So it provides a mid-point reference for the alternating current.
• Faults or short circuits to the neutral point can be dangerous as it allows high currents to flow through equipment earthing conductors. Proper insulation and fusing is required for the neutral wire.
• In many circuits, the neutral point is connected to ground or earth. This helps ensure that the neutral point remains at essentially zero voltage at all times. But this is not always the case.
• In high voltage circuits, the neutral point is frequently derived from a transformer's center tap. This helps produce two equal voltage outputs from the transformer with respect to the neutral point.
That covers the basic highlights about the neutral point in electrical circuits. Let me know if you need more details.