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Why neutral cross section is half the phase in three phase cable while it has to carry current of summation of all phase..?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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Why the neutral cable takes high current than the phase lines in three phase installation?
In a properly balanced three phase system, there is negligible current on neutral. If there is substantial current on neutral, then the system is not balanced and/or something is wrong.
Why half size of neutral conductor in 3.5 core cable?
Because neutral doesn't have to carry the load current .This is either used for unbalanced current (in Y-connection) or for earthing purpose which don't require high ampere rating....
What does the NEC section state regarding the white wire in romex if it is to be used as a hot leg to a switch?
The code stated that if the white wire in a two wire cable is used for a current carrying conductor that it be identified as a current carrying conductor by identifying it with a marker. Usually this marker is three wraps of black electrical tape. This way anyone working on the circuit knows that the wire could be "hot" and it is not a circuits neutral wire.
How do you reduce volt drops in cables?
You can draw less current, half the current gives half the amount of volt drop. Or use a thicker cable because doubling the cross-section area would also give half the volt drop.
What is current carrying capacity for 300mm2 cable?
The nearest equivalent in AWG is 600 MCM which is 304 mm squared. A 600 MCM copper conductor with an insulation factor of 75 or 90 degrees C rated at 420 and 455 amps respectively.
Why the neutral cable takes high current than the phase lines in three phase installation?
In a properly balanced three phase system, there is negligible current on neutral. If there is substantial current on neutral, then the system is not balanced and/or something is wrong.
When determining size of neutral cable what does third harmonic refer to?
In a perfectly balanced three phase wye system, there is no neutral current, and the neutral conductor is only used to hold the reference point during transient states. As a result, the neutral conductor is often smaller than the three hot legs. However, nothing is perfect, and there will be neutral current. Since there are three phases feeding back to neutral, instead of one, the frequency component of the neutral current is 180 hertz, instead of 60 hertz. If the load represents a full wave rectifier, as in a large DC power supply, or a welder, the neutral current will be 360 hertz. That is the third harmonic of 60 hertz. That frequency is high enough to make the impedance of the neutral cable a factor, so the cable must be sized accordingly.
Why is the neutral wire in any system half the magnitude of the line wire?
in case of motor, only 3core cable are used. Because there is phase balence between the winding. But in case of wiring,panel installation, 3.5c cables are normally used. Because there is unbalenced between the phase current. So the neutral taken to give the return path to flow of unbalenced (rush) current. Which always less than phase current,so the neutral cable is take half of the phase cable.
Why half size of neutral conductor in 3.5 core cable?
Because neutral doesn't have to carry the load current .This is either used for unbalanced current (in Y-connection) or for earthing purpose which don't require high ampere rating....
In 3 phase wiring why neutral is thinner than that of phase?
As normally load distribution is done equally in all three phases, almost balanced current is drawn by load and current flow though neutral is very small when compared to the phase and hence difference in cable size is observed
How much power can you run on 2.5mm cable?
When you say "Power" you're talking overall wattage. But, what you need to find is the current limit for that gauge cable, which is everywhere on the internet. Try the NEC Section 300
Where is The location of 2000 Avalon park-neutral sensor?
its called a neutral safety switch. its located on the transmission wher the shift cable connects, see wiring connector where shift cable is connected,that is your neutral safety switch (park-neutral) Cheers!!!!!
What is current capacity of 95 sqmm cable?
what is current capacity of 95 sqmm cable?
Where is the location of the park sensor?
its called a neutral safety switch. its located on the transmission wher the shift cable connects, see wiring connector where shift cable is connected,that is your neutral safety switch (park-neutral) Cheers!!!!!
Why neutral wire carry no current?
Usually yes, sometimes no. For instance: The neutral in a single-phase, 120V (in the US) branch circuit, such as one feeding receptacles, does. The neutral in a 120/240V circuit feeding a 240V appliance does not. The neutral in a 480Y feeder feeding a balanced load does not. A neutral is there because of the possibility that current flow could occur. For instance, in a US household, with 120/240V service, if you plugged in 5 100 watt lamps on one side of the line, and another 5 100 watt lamps on the other hot leg, there would be no neutral current in the service cable feeding the house. The loads are said to be 'balanced'. The 500 watts of power flowing into the first hot leg goes through the first set of lamps, then the second set, then out the other hot wire. Neutral current still flows in the individual branch circuits, of course. Now, if you moved one of the lamps to the other side, 600 watts would be coming into that side, but only 400 would be going back out the other hot wire, so 200 watts would flow through the neutral.
What does the NEC section state regarding the white wire in romex if it is to be used as a hot leg to a switch?
The code stated that if the white wire in a two wire cable is used for a current carrying conductor that it be identified as a current carrying conductor by identifying it with a marker. Usually this marker is three wraps of black electrical tape. This way anyone working on the circuit knows that the wire could be "hot" and it is not a circuits neutral wire.
For 100kw which cable size is good and how to find out cable size?
100 kw is the power drawn by the load. to calculate the cable size you need to know the voltage. From that you can calculate the current. this decides the cable size. for example if the voltage is 400Volts then the current flowing in the circuit when the load is 100 KW will be 250 amps. (100,000/400). for 250 amps to flow with out causing excessive heating of the cable the cross sectional area of the copper cable should be 150 sq mm.for a round cross section the diameter will be roughly 15mm.
