Electronics & Software – Tips & Guide

ac dc supply

What is the purpose of a neutral wire?

What is the purpose of a neutral wire?

The purpose of the neutral wire is to complete the 120 volt AC circuit by providing the path back to the panel where the neutral wire is connected and connected to the ground. The neutral wire is an insulated wire because it is part of the circuit in which electrical current flows.

What is a neutral wire?

The “neutral” is simply a cable attached to a center tap of a utility-provided electrical transformer. This neutral wire is then connected via a cable to the ground of the transformer and clamped in the ground at the pole / pad on which the transformer is located.

For the standard US power supply, the mains transformer reduces the high voltage (distribution voltage) on the secondary side to 240 VAC (phase to phase) or 120 VAC (phase to neutral or the center of the coil).

The green wire or ground is connected directly to a ground bar in the ground of your panel. The neutral is the 0V AC reference for the 120V AC. Without this neutral, you will not have the “potential difference” your electronic devices can “see” for 120V AC operation.

This is also the way back for the power in normal operation. The ground (green wire) is mainly used for protection in case of failure, so that the current flows through a sufficiently low impedance path (Z or R for resistance) to earth, so that a circuit breaker / relay can be triggered (I = V / Z, high current = release switch (15A, 20A, etc.) and protects people / property.

Why do we need neutral wire?

The neutral wire is only present in star connections and this also helps to maintain a single-phase supply. In a symmetrical 3-phase star system there is no current in the neutral wire . In a single-ended system, however, a certain current flows through the neutral wire.

In our home connection, there is a phase wire and a neutral wire. In this large system, keeping the system in a balanced state is almost impossible, so we provide a neutral wire through which a certain amount of current flows.

Another feature of our system is that it provides a single-phase supply to our homes. The three-phase supply is more efficient than the single-phase supply, but there is a high risk of life, because if you get a single-phase shock, there is a possibility that you get a shock-free state The power is in tact, but in the 3-phase supply the performance never becomes zero.

Once you get stuck, there is no way to get rid of them until someone turns off the supply.

In this way, at the risk of death, we can reduce efficiency, but the entire transmission and distribution system is three-phase, but at home you need a single-phase supply. At this time, a neutral wire is created. It delivers a single-phase supply and our household appliances are designed for 220 or 230 volts. This voltage is phase-to-neutral voltage, not phase voltage phase. That’s why we need a neutral wire in our system.

What are the works of neutral wires?

Neutral is the return path for an AC circuit, which should carry current in the normal state. This current can be due to many reasons, mainly an imbalance of the phase current and sometimes also to the 3rd and 5th harmonic.

There may also be other reasons, but the magnitude of this current is a fraction of the phase current and in some cases may even be double the phase current. It is therefore always assumed that the neutral wire is charged. This neutral wire is grounded to bring the second terminal of the neutral to zero potential. A wire with zero potential with respect to the earth is a neutral.