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In a three phase motor each leg (3 phases) in the down cycle alternating at 1/60 per second servers as a neutral, you are only required to ground (green) the frame of the motor for safety. This is similar In a single phase motor wired for 240v (2 phases) the same thing happens and you are only required to ground (green) the frame of the motor for safety. From: Ken F
What else can I help you with?
What kind of motor is used either on ac or dc supplies?
single phase induction motor
How do you differentiat dc motior and ac motor physicaly?
if you power an ac motor with dc or a dc motor with ac you will likely start smelling smoke and the motor will be damaged. If the motor is marked "3-phase", "shaded pole", or "induction" it is an ac motor! BTW, there are ac/dc motors that will run on both, they are wound very much like dc motors but a bit differently.
Why do you connect a capacitor with an Ac motor?
The capacitor is used to create a second phase from the single phase power source and it is the interaction between these two phases that causes the motor to turn.
What size feeder and breaker is needed for a 15 ton AC - 3 phase at 440 Volts?
Would have to know the current rating of the motor or each of the phases on the motor when running. 3 Phase motors usually use mucvh less current than their single phase counterparts. My son has a lot of 3 phase equipment in his shop and most of them run under 5 amps per leg. But you really need those specs from the motor.
Does current ever flow in the neutral wire?
In 120 VAC circuits, the neutral wire carries all the return current from the hot wire. In a single phase 120 VAC circuit, such as found in US homes, the neutral wire carries exactly the same amount of current as the hot wire (unless there is a fault in the device). The difference is that the neutral wire is connected to the ground bus in the load center (also called "breaker box" in the Southern US).In a three phase circuit, as was pointed out by another person, the neutral wire will carry any current that results from an imbalance in the phases. If the three phases are perfectly balanced, for example when connected to a motor, there will be no current in the neutral conductor. (In fact, in a three phase delta connection, there is no neutral. But I will not attempt to explain that here, beyond simply mentioning it.)Nevertheless, anything that causes an imbalance in the phases of a three phase system will cause neutral current to flow. The amount of neutral current in a three phase system may be calculated using the phase relationships of the three phases, provided the imbalance is known, or simply measured with a standard AC current meter. (However, I must qualify this by saying that three phase systems are complex and hard to understand. It is easy to be fooled when working with such a system, and I would not undertake it without a thorough review of the principles involved. They do not behave in a simple and obvious manner.) However, I do believe that the neutral wire in a three phase system is often much smaller than any of the phase wires, because it is not called upon to carry the full current, but only the relatively small currents resulting from load imbalances.In a 240 VAC system, such as is used to supply power for an AC unit in the US, again typically the neutral will not carry current unless there is some sort of problem. Rather, the current flows in the two hot wires. As before, the neutral wire is connected to ground at the load center, and is usually connected to the metal chassis of the device being powered, whether it be an air conditioning system, electric range, or hot water heater. This is to provide safety for the user, and also will help to trip the breaker if there is an insulation breakdown within the device.Modern 120 VAC systems in the US have three wires. A safety ground wire has been added, and this is always connected to the metal chassis, except in certain devices that have extra insulation, such as power drills and most lamps. This ground wire is only for safety purposes, and normally does not carry any current. While the neutral wire is also connected to ground at the load center, it is a current carrying wire in a 120 V system, so is not usable for grounding the chassis as in the 240 VAC system. However, if there is an insulation breakdown problem in the device, the safety ground will conduct current and trip the breaker at the load center.Interestingly, the fact that the neutral carries the same current as the hot wire in a 120 VAC system is used as the operating principle for Ground Fault Detectors. An electronic circuit in the GFD device compares the current in the hot and neutral wires. If they are not equal, the device trips a relay, removing power from the device. If the hot and neutral currents are not equal, this indicates an insulation breakdown, where some of the current is leaking to an improper place within the device. The Ground Fault circuit detects this and shuts down the device very quickly, preventing electric shock and potential loss of life.
Where is the neutral for 25kv ac single phase supply used for electric locomotives?
from ground
How do you turn a 3 phase motor in to a generator?
We can convert a 3 phase ac motor into generator by changing phase sequence of the ac input cable of that motor
Why do you have 230vdc from neutral to ground in a three phase 460vac panel?
Neutral is grounded in a distribution panel. At best, it is only a few tens of millivolts away from ground and it certainly would not be DC - it would be AC.
Three phase ac motor voltage between phase and ground varying from 75v to 150v why is this?
there are a few potentual problems here, 1: could be a bad neutral ie ; feeding back through your earth 2: induced voltage some where along the line
Is schrage motor ac?
As the motor is a three phase machine,it must be AC supply
How do you reverse single phase ac motor to generator?
how reversing an ac single phase induction motor to wark as induction generator
Which ac motor gives high output rpm?
ac universel single phase motor
Classification of ac motor?
ac:1) 1 phase 2) poly phase 3)universal
What are the types of single phase ac motor?
capacitor start motor
Is a 3 phase motor a Synchronous motor?
A synchronous motor can be a type of 3-Phase AC motor, or not.A synchronous motor is defined by the period of the rotor being synchronized with the frequency of the stator windings' current. The stator windings might be 3-Phase or not (2-Phase would work).Also synchronous motors are not the only type of 3-Phase AC motors. An induction motor could also be 3-Phase AC and has a few advantages and disadvantages over a synchronous motor.
In ac single phase circuits what is the neutral for?
The neutral in single phase AC circuits is used as the common power return conductor for half phase operation. In a typical (US/Canada) 120/240 split phase system, generally used in residential applications, the voltage between neutral and either of the two hot conductors is 120 VAC, and the voltage between the two hot conductors is 240 VAC. Neutral is also grounded at the distribution panel, as well as at the utility distribution transformer, in order to limit the voltage of any conductor relative to ground, and also to be able to detect ground faults by sensing imbalance between neutral and hot currents. Note that this is not called two phase power. It is single phase, or split phase, and it comes from one center tapped transformer winding. The center tap is neutral.
What are white black and green colors represent on electrical wires?
In the US, the common usage of these colors is: BLACK: Hot - connected to one phase of the service AC. WHITE: Connected to the Neutral of the service AC. GREEN: Connected to the GROUND bus at the service entrance. At the service entrance, the GROUND and the NEUTRAL bus are connected together.
