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∙ 12y agoNo, never use the neutral conductor for anything but a neutral. If the house has no grounding system then there is no need to connect the fan ground wire to anything. Just keep in mind that the wiring in the house could be 70 plus years old and the insulation on this wire will be starting to break down if handled too much. Just cap the wire off and install the fan. Old two wire knob and tube systems were used in the 20's and they never used a ground with them. In the 40's NMD cable was used but it also never had a ground wire. It was in the early 60's that the third wire was added to NMD cable, it was a bare copper wire that was used for grounding equipment. Now the new wiring code states that there must be a grounding system in place for new installations.
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∙ 10y agoNo, the neutral wire cannot be used to convert a two-wire system into a three-wire outlet. A proper grounding wire is needed to create a safe and compliant three-wire system. Attempting to use the neutral wire as a ground can be dangerous and is not recommended.
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∙ 12y agoGround and neutral are only supposed to be bonded at a single location at main panel. If you do this at an outlet and plug in a grounded device you could create what is known as a ground loop and create a possible shock hazard.
In a three-phase system, the neutral conductor only carries the unbalanced current resulting from the imbalances between the three phases. Since the sum of the three phase currents is zero in a balanced system, the neutral conductor's current will be half the current in each phase conductor when there is full load. This is due to the cancellation of currents in a balanced system.
If the motor is operated from a three phase three wire distribution system the motor will not need a neutral wire.
The limit or range of the neutral current in an unbalanced three phase system is the third harmonic in single phase non-linear load current is the major contributor to neutral current.
The neutral conductor is typically grounded in a four-wire three-phase system to provide a path for fault currents to return to the source and to stabilize the system voltage. Grounding the neutral also helps to protect equipment and personnel from electrical hazards.
Neutral is the current return for the hot leg(s). Neutral is grounded, so as to limit the maximum voltage of any of the hots with respect to earth ground. In a typical residential 120/240VAC split phase system, either of the hots with respect to neutral is 120VAC. In a three phase system, neutral is at the center of the wye configuration, and each of the three hots returns power to it.
No a 208 volt outlet does not need a neutral. 208 volts is the line voltage between any two legs of a three phase 208 volt system.
the bare copper is always a ground
A delta-connected system is described as being a three-phase, three-wire, system, and doesn't have a neutral. But a balanced star (wye) connected load (e.g. a three-phase induction motor) doesn't actually require a neutral.
This can be tricky. You can only place a receptacle from the location of the box where the three way circuit is fed from. The wires from the three way to three way boxes only carry the "hot' traveller wires. There is no neutral carried from box to box even though there might be a white wire in the three wire group. So you have to locate where in the three way system the hot and neutral wires are located. From this location you can extend new black and white wires to your new receptacle outlet.
In a three-phase system, the neutral conductor only carries the unbalanced current resulting from the imbalances between the three phases. Since the sum of the three phase currents is zero in a balanced system, the neutral conductor's current will be half the current in each phase conductor when there is full load. This is due to the cancellation of currents in a balanced system.
Nominally 120 Volts.
If the motor is operated from a three phase three wire distribution system the motor will not need a neutral wire.
Zero, or very close to it. If there is a large neutral current flowing, voltage drop on the neutral leg could cause a volt or so to read between the two. If you read full line voltage, the outlet is wired wrong!
Earthing point is where conductor is directly connected to ground and its potential is always zero. Neutral is a return path in single phase system and in three phase system Neutral point will have zero potential if all the loads are balanced in the system. In un balanced three phase system even neutral point will have some potential
TPN Load break switch: Is basically a main switch used in three phase system and know as Three pole neutral or Three phase neutral having four connectors for three phases and one neutral.
If all three legs of the system are balanced then zero amps will flow all the way up to 100 amps if only one leg of the three phase system is used. The neutral in a wye three phase system carries only the unbalanced current. This is why in services for a three phase four wire system you are allowed to reduce the size of the neutral conductor.
Line, phase, neutral are terms used to describe the conductors in a three-phase system. The three live wires are called 'lines', and less correctly, 'phases'. Neutral is used for the fourth wire which in a balanced system carries no current.