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No, 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.
What else can I help you with?
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.
When does a motor not need a neutral wire?
If the motor is operated from a three phase three wire distribution system the motor will not need a neutral wire.
What is the limit or range of the neutral current in an unbalanced three phase system for it to be regarded as faulty?
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.
What conductor should be grounded in a four wire three phase system?
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.
Why neutral is required?
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.
Does a 208 volt outlet need a neutral?
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.
When wiring a range the outlet has a neutral ground and 2 hots you have three wires do you put the bare wire in the neutral or ground on the outlet?
the bare copper is always a ground
Condition of three phase in which there is no need of neutral?
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.
How do you connect a new convenience outlet to a 3 way switch in different locations?
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.
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.
When does a motor not need a neutral wire?
If the motor is operated from a three phase three wire distribution system the motor will not need a neutral wire.
On a standard three prong AC outlet what should the AC voltage measure between neutral and hot?
Nominally 120 Volts.
On a standard three prong AC outlet what should the AC voltage measure between neutral and ground?
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!
What is the difference between neutral point and earthing?
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
What is break load?
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.
How much current will flow in neutral line for three phase supply 100amps?
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.
What is line phase neutral?
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.
