Answer for USA, Canada and countries running a 60 Hz supply service.
Yes, you have to have a ground rods connected to the system. This is especially important in North American systems as a split phase is in use. The center-point winding by code must be grounded. This is a backup in case the neutral conductor becomes open. If this backup was not in place, due to the configuration of the distribution panel, 240 volts could be applied across two 120 volt loads which would be a series connection. If the resistance across both of these series loads is equal nothing will happen as the voltage drop would be even at 120 volts. If the series load resistances are not even then uneven voltage drops will appear. This could cause higher that allowed current to flow through devices that would damage them. Periodic maintenance of the ground rod connections should be done by every homeowner to make sure the connections are clean and tight.
Yes, a subpanel must have a separate grounding conductor running back to the main panel to provide a safe path for electrical faults. This grounding conductor is in addition to the neutral conductor and helps prevent the possibility of electric shock and ensures proper operation of circuit protection devices in the event of a short circuit.
You will need a ground rod, ground wire, and grounding clamp. To install a ground cable, drive the ground rod into the soil near your outlet's location, then securely attach the ground wire to the rod using a grounding clamp. Connect the other end of the ground wire to the outlet's metal box or any existing ground wire in the electrical system.
If the plastic box has a ground wire attached to the GFCI and the ground at the fuse panel, you do not need to ground the box itself. As long as the ground wire is connected to the GFCI and the fuse panel, the box will be effectively grounded. Just ensure that all connections are secure and properly fastened.
You will need to install a 4-wire feeder cable between the two panels. The two hot wires will connect to the main breaker in the main panel, the neutral wire to the neutral bus bar, and the ground wire to the ground bar. Make sure to follow local electrical codes and regulations. If you are unsure, consult with a qualified electrician.
No, the ground wire on a 200 amp panel does not need to be looped through both ground rods. The ground wire typically needs to be connected to the grounding electrode system, which may include ground rods, but it does not need to loop through them. It is important to follow local electrical codes and guidelines when installing grounding systems.
To extend the underground wire to your new shop, you would need to run a new wire from the existing panel to the new shop location. Ensure you use the appropriate wire size for the distance and amperage load (100 amps) to meet building codes and safety standards. It is recommended to hire a licensed electrician to perform this work to ensure it is done correctly and safely.
If the sub panel is in the same building remove the bonding screw that bonds the neutral bar to the panels enclosure. Remove the ground from the second ground rod. The sub panel is grounded by the ground wire from the sub panel's feeder. If the panel is separate from the main building treat the sub panel as a separate service. It will need its own ground rods and ground wire from the rods to the neutral bar of the sub panel. Leave the bonding screw in. There will be no ground wire in the conduit between the two services.
You will need a ground rod, ground wire, and grounding clamp. To install a ground cable, drive the ground rod into the soil near your outlet's location, then securely attach the ground wire to the rod using a grounding clamp. Connect the other end of the ground wire to the outlet's metal box or any existing ground wire in the electrical system.
Certainly your neutral bus is not properly bonded to the ground buss and grounding electrode conductor. But the size of your voltage worries me. You need a competent electrician to check this one for you.
A typical panel has three large wires entering the main panel from the electric meter and a bare ground wire. Two of the large wires are hot and go to the busses where the breakers are mounted. The third wire is common and is connected to one or more common bus locations. It will usually be silver in color with a screw on top to connect white wires from branch circuits. The ground is the metal of the panel itself and there will be one or more ground busses usually copper colored that are connected to the metal of the panel by screws there by "bonding" these ground busses to the metal of the panel. You should also see a copper wire coming from a ground rod connected to the metal of the panel. At the main panel you need to bond the common to the ground. There is usually a screw that allows this bonding to occur. If you have subpanels ground and common are NOT connected at the subpanels.
A #3 copper conductor with an insulation factor of 90 degrees C is rated at 115 amps. Even though the panel is rated at a higher amperage it is the main breaker that governs the wire size.
Yes. The panel must be grounded with its own grounding rod. The ground will not be provided with the feeders to the panel, these will only contain your phase wires and neutral. Also make sure that any subpanel installed does not have the neutral bonded to ground. This should only be done at the main panel where the electrical utility service is connected.
Yes, to the precision you can measure it. If it isn't you need to check the ground to neutral bonding at main panel and check the wiring in the circuit for loose connections.
If the plastic box has a ground wire attached to the GFCI and the ground at the fuse panel, you do not need to ground the box itself. As long as the ground wire is connected to the GFCI and the fuse panel, the box will be effectively grounded. Just ensure that all connections are secure and properly fastened.
You will need to install a 4-wire feeder cable between the two panels. The two hot wires will connect to the main breaker in the main panel, the neutral wire to the neutral bus bar, and the ground wire to the ground bar. Make sure to follow local electrical codes and regulations. If you are unsure, consult with a qualified electrician.
No, the ground wire on a 200 amp panel does not need to be looped through both ground rods. The ground wire typically needs to be connected to the grounding electrode system, which may include ground rods, but it does not need to loop through them. It is important to follow local electrical codes and guidelines when installing grounding systems.
Conductor
Not exactly sure what your question is and you need to make sure you are in compliance with electrical code for your jurisdiction. But, generally speaking you install a large breaker (let's say 100A 2 pole breaker to power the sub panel) just as you would install any other breaker in the presently used (hot) panel, and the proper sized cable then goes from old to new and terminates on the main lugs of the new panel. Ground and neutral are usually isolated from each other in the sub panel but depends on other factors as to location of the sub panel, etc.