You can use resistance or reactance grounding on generators and motors. My understanding is resistance grounding is often used to limit ground fault currents to a few amperes, while reactance grounding will limit fault current to less than the three phase fault current. If reactance grounding is used to limit fault current o very little (like resistance grounding), transient overvoltage problems can occur.
If the electrical box is grounded, check with a tester, the "hot" wire will have a voltage to the the grounded box the neutral wire will not. If the box is not grounded, with the breaker supplying the voltage turned off, use a tester on the resistance scale to check for continuity between the wires and a cold water pipe or some other grounded medium. The neutral will have continuity between the wire and a ground the "hot" wire will not.
The neutral.
A bare grounded neutral should never get close to the ground if it is wired properly. When the neutral leaves the meter base it is in conduit and should enter into the distribution panel where it connects to the neutral buss. It is at this junction that the copper ground wire is connected after coming from the outside ground rod or ground plate which ever grounding system was used.
The neutral conductor, or "grounded conductor", takes the unbalanced current back to its origin if wired correctly. If it finds a ground path before it makes it back to the panel, it will take it. If you take a neutral off its path back to a panel, and happen to touch a grounded surface, such as a metal case, you will become the ground path. That being being said for safety's sake, I will continue. The neutral wire completes the circuit. A neutral wire unattached to a neutral bar is an extension of the "hot" wire, or ungrounded wire, and will spark if grounded. If that unattached neutral touched a different circuit of a different phase, then what ever was connected between the hot and neutral wires just went poof. I hope that helps a little.
Answer for USA, Canada and countries running a 60 Hertz supply service.There is only one place that the neutral can be grounded and that is at the service distribution box that containing the first over current device. You have the neutral coming into the box and the ground wire going to either a grounding rod or the water line where it comes into the house.
It means the neutral is not grounded.
What you need to define is the statement "utility- sized electrical generator". It depends on what the generators output is used for as to the way it is internally wired. In some configurations there is no neutral to ground as in a Delta configuration.If the generator is configured for a Wye output and the neutral centre tap is not grounded there will be a floating voltage between the generator and the utility system ground. It is for this reason that the generator's neutral point is grounded to bring the floating voltage down to zero volts to ground.
only neutral point is gronded not a terminal ,
The question doesn't provide enough detail to give a definitive answer. The neutral PD is often used in protective functions on high resistance grounded generators (when grounded through a transformer). High resistance grounding limits the use of transformers - you must be using balanced loads, since very little current will flow (typically around 5-20amperes max) to the neutral. Because of this, phase to neutral values (such as voltage) are meaningless. Any current flowing in the neutral will cause an offset in all three phases from neutral. Since the neutral is high resistance grounded, it does not take a significant amount of current to cause significant offset.
Reactance grounding is done to lower ground fault current amounts, often to protect generators. It's done by tying the neutral of a generator to a grounding reactor (the other side of the reactor is tied to ground).
If the electrical box is grounded, check with a tester, the "hot" wire will have a voltage to the the grounded box the neutral wire will not. If the box is not grounded, with the breaker supplying the voltage turned off, use a tester on the resistance scale to check for continuity between the wires and a cold water pipe or some other grounded medium. The neutral will have continuity between the wire and a ground the "hot" wire will not.
There is normally no voltage on the neutral line because the neutral line is grounded. However, and this is always important, do not assume that neutral is grounded, nor that there is not an elevated voltage on neutral or ground due to a possible ground fault.
The neutral of a generator should never get into a condition where is is floating. All generators have the neutral tied to the frame of the generator set. It comes this way from the manufacturer. If it is floating then someone has disconnected the neutral wire from the frame. Just reconnect the neutral to the generator frame again to stop it from floating. Larger generators should also have a ground rod connected to the generator frame for grounding purposes.
either the neutral safety wire is not grounded, or hoodpin wire is grounded. or the fuse is blown
The grounded conductor (Neutral) can be white or gray. The grounding conductor can be solid green, Green with a yellow tracer or bare copper.
The neutral.
A 400/230-V three-phase generator hase three line terminals, together with a neutral terminal. The line voltage (i.e. the voltage between any pair of line terminals) is 400 V, while the phase voltage (i.e. the voltage between any line terminal and the neutral terminal) is 230 V.