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 100-A sub-panel would be fed from a 100-A breaker.
Yes. Many installations have breaker totals higher that the main breaker of the panel. It is worked on a percentage basis. Not all of the breakers will be on at the same time. In a home, on a 100 amp panel the average load is 50 - 60 amps. The 100 amp main breaker is protecting the 100 amp rated panel board. If the load current goes higher that the panel board is rated at, the main breaker will trip to protect the board.
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 should not load a 125 amp panel any more than 100 amps.
# 10 bare copper.
The recommended ground wire size for a 100 amp sub panel installation is typically 8 copper wire.
A 100-A sub-panel would be fed from a 100-A breaker.
#8 would be fine if you ground each panel separately to the ground rod
If what you state in this question is accurate this is an illegal installation. A 100 amp service can not have any equipment connected to it less that that of the service size. The 60 amp main panel must be a 100 amp panel to be a legal installation.
The maximum current capacity of a 100 amp service panel is 100 amps.
In the service distribution panel there are termination points at the top of the panel. Two of the utilities "hot" conductors terminate on the main breaker. The neutral utility termination point is on a terminal block usually off to the side near the main hot terminations. It is in this neutral termination block where the system ground connects from the ground rods to the distribution panel. For a 100 amp panel the wire size will be a #6 bare copper conductor.
The maximum amperage capacity of a 100 amp panel with a main breaker is 100 amps.
The key difference between a 100 amp panel and a 200 amp panel is their electrical capacity. A 200 amp panel can handle double the amount of electrical load compared to a 100 amp panel, making it more suitable for larger residential properties or homes with higher electricity needs. The 200 amp panel provides more room for additional circuits and appliances, while the 100 amp panel may be sufficient for smaller homes with fewer electrical demands.
A 200 amp electrical service panel can handle more electrical load than a 100 amp panel. This means it can power more appliances and devices without overloading. The 200 amp panel is typically used in larger homes or buildings with higher electricity needs, while the 100 amp panel is suitable for smaller homes or buildings with lower electricity demands.
you propaly can't sub panel from 100 amp panel. Just not enough amperage to be worth while. i had to up grade t a 200 amp main first and then I was able to take a 60 sub panel from that.
For a 100 amp service panel, typically a #8 copper wire or a #6 aluminum wire is recommended for grounding purposes. It's important to follow local electrical codes and regulations when selecting the correct size of the ground wire. It's always a good idea to consult with a licensed electrician for specific guidance based on your individual circumstances.
The 100 amp sub panel wire size chart provides information on the recommended wire sizes for different distances and types of wiring to safely and efficiently supply power to a 100 amp sub panel.