Only in the main electric panel.
By National Electric Code only the Main Panel should bond ground and neutral. If subpanels have ground and neutral bonded, it could cause ground loops and shock hazards.
The neutral and ground are only bonded in a sub-panel of an out building if the code requires a buried ground rod or plate at this location.
The main electric panel is where neutral is bonded to ground. There is usually a screw or strap that connects the two so the same type panel could be used as a subpanel and have the neutral and ground unbonded in subpanel.
With very few exceptions your neutral and ground are always bonded together at the service. They can be bonded together anywhere from the transformer to the first overcurrent device, usually a panel, but in the transformer is where it is usually done. Bonding the neutral keeps your voltages from floating. Without going into very technical explanation, suffice it to say that without proper bonding you can get different voltages supplied to various circuits in the building or home. Higher voltages can cause burn out of fixtures or equipment and lower voltages can burn up motors or keep lights from providing adequate light.
Ground wire can be appropriately bonded to the neutral and cabinet at the service box by connecting the neutral and ground wires from the feeder wires to the neutral bus bar and the ground terminal located on the same cabinet at the service box. White wire (neutral) must be connected to bus bar and bare wire must be connected to ground terminal in the same cabinet.
By National Electric Code only the Main Panel should bond ground and neutral. If subpanels have ground and neutral bonded, it could cause ground loops and shock hazards.
The neutral and ground are only bonded in a sub-panel of an out building if the code requires a buried ground rod or plate at this location.
Answer for USA, Canada and countries running a 60 Hertz supply service.Nothing but the neutral bus should be bonded to the ground electrode.
The main electric panel is where neutral is bonded to ground. There is usually a screw or strap that connects the two so the same type panel could be used as a subpanel and have the neutral and ground unbonded in subpanel.
With very few exceptions your neutral and ground are always bonded together at the service. They can be bonded together anywhere from the transformer to the first overcurrent device, usually a panel, but in the transformer is where it is usually done. Bonding the neutral keeps your voltages from floating. Without going into very technical explanation, suffice it to say that without proper bonding you can get different voltages supplied to various circuits in the building or home. Higher voltages can cause burn out of fixtures or equipment and lower voltages can burn up motors or keep lights from providing adequate light.
Ground wire can be appropriately bonded to the neutral and cabinet at the service box by connecting the neutral and ground wires from the feeder wires to the neutral bus bar and the ground terminal located on the same cabinet at the service box. White wire (neutral) must be connected to bus bar and bare wire must be connected to ground terminal in the same cabinet.
It may be the GFCI breaker is defective. Make sure it is wired correctly. Neutral to neutral bar and ground to ground bar.
Grounding is an important part of all electrical wiring like your home. Without proper grounding you are asking for all sorts of strange problems and safety issues. The power company provides electricity to your main panel and a good ground is required. This is usually a metal rod in the ground near your meter. This ground is bonded to the main electric panel. The neutral wire is in turn bonded to ground at the main panel. If you have a bad ground, neutral can float above ground causing shock hazards. I once had to chase down a shock problem in a shower. It turned out to be a case where the neutral and ground were not bonded at the main panel. What you shouldn't do is the hot side of power to ground.
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The rounded third prong goes to earth ground at the main panel where the neutral is also bonded to ground.
It is very rare to have three-phase electricity coming into a residence. One of the wires is probably the neutral (It will be white or black with white stripes.) The ground comes in from a ground rod near the main, and connects to the ground coming from the meter, AND (If the main fuse box is the first disconnecting means,) the neutral and ground bars have to be bonded together in the box.
In an AC circuit, the ground is a non-current carrying conductor that is bonded to the neutral (and earth) at the panel or service, and is also connected to the cases of all items of electrical equipment other than those which are double-insulated. In a DC circuit, ground is usually the negative battery terminal that is bonded to the frame of the DC apparatus. In a car, the negative (usually) is bonded to the frame and body of the car.