Subpanel help

[Danj6767]

Hello,I built a detached structure. I am planning on running a 100 amp line from the main. A friend gave me a 200 amp full panel today use,lots of connections. My question is do I have too change the main breaker on panel to match the feed?

Thanks you for any and all help..

Dan

 

[wyliesdiesels]

No you dont need to change the main in the subpanel.

It will just act as a disconnect.

The breaker in the feeding panel will serve as the overcurrent protection.

Make sure to isolate the neutral bar in the subpanel.

You may need a ground bar kit.

Also the feed needs to be 4-wire and dont forget 2 ground rods

 

[alfredeneuman]

As long as the breaker in the Main is 100A, the 200 in this case serves only as a switch.
It's NEC compliant.

 

[Jim greengo]

No you dont need to change the main in the subpanel.

It will just act as a disconnect.

The breaker in the feeding panel will serve as the overcurrent protection.

Make sure to isolate the neutral bar in the subpanel.

You may need a ground bar kit.

Also the feed needs to be 4-wire and dont forget 2 ground rods

:

 

[ddawg16]

No you dont need to change the main in the subpanel.

It will just act as a disconnect.

The breaker in the feeding panel will serve as the overcurrent protection.

Make sure to isolate the neutral bar in the subpanel.

You may need a ground bar kit.

Also the feed needs to be 4-wire and dont forget 2 ground rods

What ^^ he ^^ said.


What kind of wire were you going to run? Conduit? If so....make sure it's rated THWN (wet locations).

Don't be afraid to up size it. Makes for an easier pull.

You might also want to consider a second conduit for data.
My garage is detached and behind my house. I actually have my internet cable going to the garage and then through conduit to my house. Saves me having the cable hanging above my yard.

 

[alfredeneuman]

If so....make sure it's rated THWN (wet locations).

XHHW is also rated for wet locations.

 

[TTnicksocal]

No you dont need to change the main in the subpanel.

It will just act as a disconnect.

The breaker in the feeding panel will serve as the overcurrent protection.

Make sure to isolate the neutral bar in the subpanel.

You may need a ground bar kit.

Also the feed needs to be 4-wire and dont forget 2 ground rods

Dont want to Hyjack the but i am doing this exact thing. New detached garage 200 Amp service on the home and installed a 100amp sub panel in the new garage.

I went with 6-3 cable for the feed to the garage. My question is on my panel these are two spots to put the ground. There is a bar that is grounded to the panel and there is another which is not grounded (sitting up on top of a plastic insulator). My 6-3 came with 4 wires. two hots a size, a 6ga neutral/ground and a bare 12-14ga wire.

Does the 6ga neutral/ground go to the insulated ground or the "grounded" bar? and Does the bare wire go on the grounded or insulated grounding bar?

 

[sberry]

We get where explained where a lot but not why. In this case some why will help with where. Feel free to jump in as I am not always clear.
So,,, the goal here is to keep all the neutrals in a second panel insulated. Note the white wire is coated. Insulation g them keeps all the operating currents on the wire they are intended to and not exposed to the frames and chassis of equipment.
The ground wire, green or bare is hooked to all the exposed.metal that has the potential to become energized at the same potential,,, think spider Web with all tied together and providing a low impedence, low resistance pathway back to its source, neutral at service main which allows the current to trip the breaker in the event of a fault,, or short circuit. By being grounded in this web there is no difference between any 2 pieces of grounded equipment including the panel enclosures.
Now the rods. They are tied to the equipment ground, anything connected to.them would be grounded and along with their primary purpose of carrying lightening and static to earth they reduce some of the step potential between equipment and the ground, concrete you are standing on. The idea of caring strikes there is to reduce the chance it is carried back to the main thru the ground wire.

 

[alfredeneuman]

Dont want to Hyjack the but i am doing this exact thing. New detached garage 200 Amp service on the home and installed a 100amp sub panel in the new garage.
I went with 6-3 cable for the feed to the garage.

6-3 UF cable is only rated for 55A, and you have a 100A breaker?

 

[sberry]

So,, all the bare or green wires connected to the ground bar in a sub including rods, in the main all connected to grounded bonded neutral. Doesn't mean you can't have an extra bar in a main, often used to reduce congestion but it must be bonded to neutral.

 

[TTnicksocal]

6-3 UF cable is only rated for 55A, and you have a 100A breaker?

Yes the panel is 100amps rated but im only going to be runnning a 60amp breaker at the main panel. If i start popping it i'll pull two more 2ga or 4ga wires and beef it up a bit.

55amps is alot... All im planning on running is;
200amp Welder
Plasma cutter
air compressor
handheld grinders
LED fluorescent style lighting

its sounds like a lot but i am a one man show and it will be rare for a few of those things running at the same time.

When i first got my Syncrowave it was running off a 50amp breaker fed by 12ga romex in the garage and never once popped the breaker.

 

[brewchief]

Hello,I built a detached structure. I am planning on running a 100 amp line from the main. A friend gave me a 200 amp full panel today use,lots of connections. My question is do I have too change the main breaker on panel to match the feed?



Thanks you for any and all help..



Dan

Is the 200 amp panel new or used? What brand and style? Used can be ok but there are some brands or styles of a brand that aren't worth the time to install even if free.

Sent from my SM-G965U using Tapatalk

 

[exranger06]

Yes the panel is 100amps rated but im only going to be runnning a 60amp breaker at the main panel. If i start popping it i'll pull two more 2ga or 4ga wires and beef it up a bit.

You can't parallel wires smaller than 1/0. And even then, the wires must all be the same gauge and type.

 

[malibu101]

Are the main lugs on most 100A panels rated for #6 wire?

 

[mike93lx]

Yes the panel is 100amps rated but im only going to be runnning a 60amp breaker at the main panel. If i start popping it i'll pull two more 2ga or 4ga wires and beef it up a bit.

55amps is alot... All im planning on running is;
200amp Welder
Plasma cutter
air compressor
handheld grinders
LED fluorescent style lighting

its sounds like a lot but i am a one man show and it will be rare for a few of those things running at the same time.

When i first got my Syncrowave it was running off a 50amp breaker fed by 12ga romex in the garage and never once popped the breaker.

Hopefully you didn't run 6/3 NM-B...

 

[Danj6767]

I ran three pvc to garage, one for the electrical, one for ethernet cameras etc, and one for a gas line..

 

[alfredeneuman]

You might as well run a water line while you're at it. You can always cap it off until you need it.

 

[wyliesdiesels]

I ran three pvc to garage, one for the electrical, one for ethernet cameras etc, and one for a gas line..

what type of wire did you use? THWN, UF-B, or?

 

[4x4Petr]

I ran three pvc to garage, one for the electrical, one for ethernet cameras etc, and one for a gas line..

You might find that the one for the gas line doesn't get used. I am a gas fitter and generally prefer to go direct burial and not through a conduit with gas piping to detached structures. Mainly because I know it won't be damaged by someone in the future trying to feed something else in with the gas pipe. It may not be that easy to feed a gas line through a pvc conduit unless it's a completely straight run. Plastic underground gas piping has termination ends that bend from underground to above usually at the point of entry in a building. If you were to install it through a pvc conduit you either cannot have the termination ends or have to use some other termination type for the plastic. Your gas fitter will have the ultimate decision. But conduits are like tools- it's better to have a spare and not need it than to need one and not have it

 

[The Cobbler]

I ran three pvc to garage, one for the electrical, one for ethernet cameras etc, and one for a gas line..

and underground gas line probably has to exit the earth outside of the structure