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Sub panel Installation

In this how to install a sub panel installation I will guide you through the complete installation of a subpanel step by step.

The first question is why are you installing a sub panel. There are either one or two reasons to do this. One because you need more room in your existing panel and in that case if your existing panel is old this would be a great time to just upgrade your current service. Newer 200 amp main panels hold a lot more circuits/breakers.

Two, because you need to bring more power somewhere else like a garage you just built or an addition or even in some cases a finished basement. Either way, you want to install a sub panel. Ok. So let’s get going.

First: Where do you plan on placing the new sub panel? If it’s right next to you main panel that’s one thing, but further away like in that new garage you just built 100 feet away you will certainly want to figure in voltage drop.  I can’t get too much into that because ever setup would be different.

Second: How many amps are you needing to the new sub panel. So let’s say you need 50 amps. Well, it’s not brain surgery, 50 amp sub panel, 50 amp wire, 50 amp breaker in the existing main panel. See wasn’t that easy.

bonding screw

bonding screw


Neutral Bonding Jumper: 

This is very very important. This is also known as a bonding screw. It may even be green. This screw is used to bond the neutral coming in the main panel to the case “panel” itself. however, in a sub panel, the neutral buss bar must be totally isolated from ground. The very first thing the electrical inspector is going to look for is if the sub panel is bonded or not.

Now as far as wiring the panel. You would wire it just like any other panel. Hot leads to the breakers, grounds to the ground buss bar and neutrals to the neutral buss bar.



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What's in the Sub-panel configuration.
Watch this video on YouTube.
Doing my best to bring you the best videos I know how.

You would install a 220 volt two pole breaker in the main existing panel. Whatever the amperage is that you’re using. That breaker gets installed in the main panel of course. This is now the main breaker to your sub panel. By turning this breaker on or off will control the entire subpanel.

Always remember safety first. Turn the main power off before removing panel covers or touching any wires.

You will need a 4 wire, wire between each panel. No matter how the panel is, this part will always stay the same. You will have two hots, one neutral and one ground. Two hots will go from the new breaker you just installed in the main panel to the sub-panel. A neutral will go from the neutral bus bar in the main panel to the NON bonded buss bar in the sub panel and a ground from the ground buss bar in the main panel to the buss bar in the new sub panel.






wire size 


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Hey Dominick, I am working on running a line out to my garage (shop) about 150-200 feet away. The plan is to run a 100 amp breaker from the main out to the shop. I assume given voltage drop, I will need to run a 2-2-2-4 wire at least, correct? essentially a mobile home feeder cable for that kind of length? Also, I plan to one day build a 2 car garage closer to the house and that will need power as well…Is it possible to “splice” or branch that one into the same 100 amp circuit and add a… Read more »


Thank Dominick
I purchased a main panel and not a sub panel. The panel came with a 200 amp main breaker and also had neutral and ground bars isolated and bonded. The green panel bond was not attached to the ground bar.

I removed the bonding strap between the neutral and ground bar. I attached the panel ground to the ground bar. I sunk two 10’ rods in the ground 8 feet apart and ran 4 gauge copper to the panels ground bar.

Does this all sound right?

Thanks again for your time.


Hello and great video. I didn’t find an exact answer to my question.
It has to do with not bonding the neutral and ground on a sub panel.
I have a cabin that I ran 3 wire 2 gauge wire from my main about 300 feet away. I will install a 200 amp sub panel in the cabin along with grounding rods to the panel. Do I still leave the ground and neutral un bonded since I have no ground back to main panel?
Thanks for any help.


Thanks, the wire has red and black and white and a ground. I believe I need to separate or have the ground and neutral on separate buss lines and do away with the connecting bar. I also need to ground the box to the ground buss with the clip attached to the green screw in the box. The ground on the main wire from the house acts as the ground but I also need to put in a ground pole outside. I think this is correct and correct me if I am wrong. Thanks


Great video. Can I use 63UFRL 500 W/GRND underground wire for a sub panel I am putting in a detached Garage. I am going to run it from house to garage about 30 feet and put in a 50 amp breaker in main panel in house.