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What else can I help you with?
How many wires are in a 3 phase circuit?
A ground, or earth, conductor is never included in the conductor count. So, a three-phase, three-wire, system has three line conductors, whereas a three-phase, four-wire system, has three line conductors and a neutral conductor.
What is the volts per phase on a 480 3 phase system?
The (ideal) voltage is 480V line to line. The line to neutral voltage (if it is a grounded system - 4 wires) is 480 / 1.732 = 277 volts. The actual measured voltage may be slightly higher or lower than this.
Why neutral cross section is half the phase in three phase cable while it has to carry current of summation of all phase..?
The current carried by the neutral of a three phase four wire system is the un balanced current. If the three phase system was completely balanced on all three phases there would be no need for a neutral, eg a three phase motor. This neutral current will be less that the phase current so a reduction in the neutral size is allowed.
Shock on a phase wire not on a neutral wire?
That's because the neutral is a grounded conductor.AnswerThe line (not 'phase'!) conductor has a potential of 230 V (Europe) or 120 V (North America) with respect to the neutral, which is earthed (grounded) at the supply panel.As you are more than likely 'earthed' (or 'grounded') by virtue of standing on it, this means that if you come into contact with a line conductor you will experience a potential difference of 230 V (or 120 V) between your point of contact with that line conductor and your point of contact with the earth, and you will receive a shock.However, as the neutral conductor is already at, or close to, earth potential, should you come into contact with the neutral conductor, you will experience no (or very little) potential difference, and receive no shock.
If the loads were only 240v on a single phase 240v system with a center tapped transformer the neutral conductor would carry?
If the loads are balanced, the neutral conductor in a single-phase 240V system with a center-tapped transformer would carry no current, as the currents flowing in opposite directions would cancel each other out. If the loads are unbalanced, the neutral conductor would carry the difference in currents between the two lines.
What is the purpose of a phase conductor?
There is no such thing as a 'phase conductor'; the correct term is 'line conductor'. In a single-phase system, the line conductor is the energised conductor; in a three-phase system, there are three (energised) line conductors.
What is the difference between a phase to ground connection and a grounded wye connection?
A 'grounded-wye' connection describes a wye-connected supply, whose star-point (or common point) is grounded. This is essential in order to ensure stable phase voltages. I'm not sure what you mean by a 'grounded-phase' connection; if you mean a 'grounded-line' connection, then this is a short-circuit to ground from a line conductor.
Is there a neutral conductor in a 3 phase 4 wire wye system?
no
What is the difference between a Grounded conductor and a Grounding conductor?
In residential 120 VAC, single-phase electrical wiring, there are three main types of electrical wires: 1. Ungrounded conductor (Hot, and sometimes called "Line" or "Phase") 2. Grounded conductor (Neutral), and 3. Grounding conductor (Safety Ground or Protective Earth) The groundED conductor is the power return, intended as a current return path from the load back to the source to complete the "circuit." Its insulation is White, gray or a non-green color with white stripes. The National Electric Code requires it be connected to earth ("groundED ") at the service entrance and usually only there. The groundING conductor is usually the safety ground which serves as an emergency current return path in the event of a circuit fault or overvoltage. Like the groundED conductor, it too is grounded at the service entrance, but is also connected to metal surfaces and parts along the circuit, groundING them. It conducts current only if the current "seeks" to return to the service entrance along a path other than the Neutral (like through your chest, should a Hot wire becomes loose and contact metal in the circuit that you may touch). Since the grounding conductor doesn't normally carry current, its cross-section is sometimes smaller than the groundED conductor's. The grounding conductor's insulation is green (no other conductors can have green insulation) though sometimes it is bare copper. Sometimes the steel metal conduit enclosing the Hot and Neutral acts as the grounding conductor.
How many wires are in a 3 phase circuit?
A ground, or earth, conductor is never included in the conductor count. So, a three-phase, three-wire, system has three line conductors, whereas a three-phase, four-wire system, has three line conductors and a neutral conductor.
What is a 240 volt 3 phase 3 wire grounded b phase system?
It's highly probably that the '240 V' refers to the machine's phase voltage. In which case, its line voltage will be 1.732 times larger -i.e. 415 V. Phase voltages are measured between any line conductor and the neutral conductor, whereas line voltages are measured between any pair of the three line conductors.
What is the volts per phase on a 480 3 phase system?
The (ideal) voltage is 480V line to line. The line to neutral voltage (if it is a grounded system - 4 wires) is 480 / 1.732 = 277 volts. The actual measured voltage may be slightly higher or lower than this.
What is phase conductor?
There is no such thing as a 'phase conductor'. The correct term is 'line conductor'. Line conductors are the three energised conductors that supply a three-phase load.
Why neutral cross section is half the phase in three phase cable while it has to carry current of summation of all phase..?
The current carried by the neutral of a three phase four wire system is the un balanced current. If the three phase system was completely balanced on all three phases there would be no need for a neutral, eg a three phase motor. This neutral current will be less that the phase current so a reduction in the neutral size is allowed.
Shock on a phase wire not on a neutral wire?
That's because the neutral is a grounded conductor.AnswerThe line (not 'phase'!) conductor has a potential of 230 V (Europe) or 120 V (North America) with respect to the neutral, which is earthed (grounded) at the supply panel.As you are more than likely 'earthed' (or 'grounded') by virtue of standing on it, this means that if you come into contact with a line conductor you will experience a potential difference of 230 V (or 120 V) between your point of contact with that line conductor and your point of contact with the earth, and you will receive a shock.However, as the neutral conductor is already at, or close to, earth potential, should you come into contact with the neutral conductor, you will experience no (or very little) potential difference, and receive no shock.
What is current in three phase and single phase?
All current is the passage of electric charges from one terminal to another through a conductor so there is no real difference in the type of current that flows in a 3 phase system compared to a single phase system.
Should there be voltage between ground and each hot of a three phase power system?
There are two types of connections in three phase systems. One is a delta connection where there is no connection to ground, so you should not get any voltage to ground. This is classed as a three phase three wire system. In this type of system any one of the phase wires could become grounded and no one be the wiser. Code requires that grounding lights be added to a delta system to visually show what the phase condition is in relationship to ground. The other type of system is a wye or star point connection. This is classed as a three phase four wire system. In this type of connection the coil ends are all joined together and grounded. You would have voltage between the phases and a lower voltage to ground. The voltage to ground would be the phase voltage divided by 1.73.Yes. If there is no voltage between a hot and a ground, either the hot isn't really a hot or the ground isn't really a ground.AnswerThere is always a potential difference between a line conductor and ground, regardless of whether it is a three-wire system or a four-wire system. This is due to the capacitance between line and ground.
