Questions tagged [subpanel]

For questions about an [electrical-panel] that is fed from another [electrical-panel] instead of being fed directly by a utility service or separately derived service (such as a generator or inverter).

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21
votes
3answers
617k views

What wire gauge do I need for a 100 Amp subpanel at the end of a 60' wire run?

I am adding an attached garage to my house. I'm going to be putting in a 100 Amp subpanel which is about 60 feet away and run through the basement joists. What gauge wire do you recommend for ...
15
votes
4answers
2k views

GFI outlets tripped after power outage

I live in a rural area that has frequent power outages (Several per month. Less than a minute in duration). When the power is restored, several GFI outlets always trip. I am trying to track down ...
15
votes
2answers
3k views

Considering doing a 100A sub panel install on my own. Any guidance would be much appreciated

My background: I am an Electrical Engineer by schooling and I'm a pretty handy guy overall. I have been working on and around just about everything since as long as I can remember. I have a good grasp ...
12
votes
2answers
140k views

How do I properly ground my subpanel that only has one neutral/ground bar?

I am adding a sub panel in an unattached building. My sub panel has the connection for the 2 hot wires coming from the source panel (a 40 amp double breaker) In addition it has one neutral/ground bar ...
11
votes
1answer
152k views

What size wire should I use to feed a subpanel in my garage?

My main panel has been upgraded to 100 amps. I would like to add a subpanel in the garage which would supply: 20 amp Mig welder running on 120 volts, but later upgrade to a larger Mig welder as i ...
10
votes
4answers
5k views

Would running a new subpanel in parallel meet NEC requirements? If not, what should I do?

Background U.S.A. Voltages/power present. My house has a 125A Power Mains breaker at the street. A buried line runs from the street breaker to my main panel on exterior wall outside of house. The ...
9
votes
2answers
51k views

How to determine the correct capacity for a sub-panel for a shop?

I plan to install a sub-panel for my woodworking shop, and would like to determine the total capacity that should supply that sub-panel. These are the main items that will likely be running in the ...
9
votes
4answers
117k views

How to properly ground a subpanel in detached building?

I Will be installing a subpanel in a detached garage. The subpanel will be 60 amp. The garage is about 30' from the main-panel in-house, and I will of course get an exact length before selecting the ...
8
votes
6answers
27k views

Can I connect a 100A subpanel to a 100A main panel?

I currently have a 100amp main service box but it is all full and some are even doubled up.I'm wondering if i can hook up a 100amp subpanel off of it? If so what size wire to go with? It would be on ...
8
votes
2answers
79k views

Why does a subpanel need separate ground and neutral?

Why does a power sub panel have to have separate neutral and ground bars other than code satisfaction? Does a sub panel need a main breaker if there is one at the main? Also, does the sub panel ...
8
votes
3answers
732 views

Federal Pacific 200a main panel problem with oversized 100a 2pole breaker

There is a 200a FPE breaker box (yes, I am aware of all the problems). It is not in the homeowners budget to replace at this time. He has 2 issues: His panel is full His electric furnace is an older ...
8
votes
3answers
15k views

Can an electrical subpanel go underneath plumbing?

I was about to wire up my new basement subpanel when I realized I had put it directly under a toilet. I don't think this is a code violation. I can relocate it with some difficulty. I'm also ...
8
votes
1answer
4k views

What wire and conduit is required for an attached-garage subpanel?

To make my garage more usable as a workshop, I'm planning to add a subpanel which can feed a number of additional outlets. 60 amps would be plenty for my current needs, but I'd like to go with 100 so ...
7
votes
2answers
45k views

Can I feed a sub-panel from a sub-panel?

here is what I have. On the corner of my house, I have the main breaker box. I also have a 2nd sub panel that was installed later on the other side of the house which has 240V ac running to it. This ...
7
votes
4answers
2k views

How to add a gfci and surge protector to pool pump line?

I want to add a gfci and surge protector to the 240v circuit for my pool pump. The 12 guage power wires (red and black) and ground (green) run from the corner of yard directly to the main breaker ...
6
votes
3answers
2k views

Can I add a subpanel?

Let me start off with the facts: I have 125 amp service that is fed via overhead lines to a center fed panel. I am maxed out on breakers, as every 110v breaker is now a tandem breaker. When other ...
6
votes
2answers
1k views

What size cable do I need for a replacement sub-panel?

I'm doing a kitchen remodel and while tearing down the walls I found quite a mess of wires from a sub-panel that exists in a small closet off the kitchen. It was so bad that I decided it needs to be ...
6
votes
1answer
16k views

200 amp service entrance to 200 amp sub panel?

I have a 200 amp service entrance outdoor breaker box. I want to install an indoor breaker box with 200 amp service about 5' away so I can access breakers from inside the house. The actual wire run ...
5
votes
5answers
5k views

I do not have power to all my breakers

I exchanged my double pole 40 ampere breaker that supplied my sub panel for my garage with a single pole 40 ampere and now out of my six breakers in the sub panel only 1,3, and 5 have power. How do I ...
5
votes
2answers
4k views

Does the neutral wire float or go to the neutral bus on a sub panel?

Does the neutral wire float or go to the neutral bus on a sub panel?
5
votes
2answers
1k views

Why does my subpanel have 4 wires feeding into the lugs?

Background: This is a sub-panel for my pool equipment (filter pump, cleaner pump, and pool light). The wires coming from the main panel come in through the bottom, and the wires going out the left ...
5
votes
1answer
2k views

Can I feed 2 sub-panels off one breaker?

I have a 225A main service panel. I also have 2 sub-panels with 125A and 200A ratings respectively. There's a 100A 2-pole breaker in my main panel. I want to feed both sub-panels from that single ...
5
votes
1answer
125 views

Is a grounded/neutral wire (not grounding wire) required to be run to a subpanel that will supply only 240V (2-pole) devices?

I'm installing a subpanel that will supply only 240V 2-pole devices. I'm positive I never will need the capability to run 120V (1-pole) devices. Am I required to run a neutral wire to the subpanel? ...
5
votes
6answers
34k views

Can I install a Subpanel (in a seperate building) using a 3 wire connection (2 hots and 1 grounded neutral)?

Can I use a 3 wire connection (2 hots and 1 grounded neutral) to install a sub panel in a separate structure if I install a separate ground rod to the grounding bus in sub panel? I have 8/3 w/o ...
4
votes
3answers
7k views

What is wrong with this panel wiring?

I have a main breaker panel downstairs, and a subpanel upstairs. After I hired an electrician to rerun the service entry cables, nothing upstairs is right, and all the upstairs lights blew as soon as ...
4
votes
4answers
1k views

Wiring up a subpanel in attached workshop

I need to wire up my attached workshop, which is about 50' from the main panel. I don't want to make a bunch of homeruns and would rather install a workshop-specific panel for this task. I will be ...
4
votes
3answers
8k views

What should I do if the AFCI breaker neutral pigtail is too short?

I am wiring a house that I built, and code says I need an AFCI for the bedroom circuit. The panel that I will be installing this AFCI breaker in is a subpanel, so my ground/neutrals are on 2 ...
4
votes
1answer
4k views

How can I add 100 amp electrical service to a shop?

I am going to wire my shop and want ot run #2 copper to a 100amp breaker panel. I really do not have the space in the 200 amp panel in the house, my question - is there a way to pull this wire off the ...
4
votes
3answers
36k views

What type of wire should I use to feed a 70 ampere subpanel?

Finishing a basement and I need to add a subpanel. Main panel is outside. Subpanel will be in the basement. 70 Amp breaker in the main to feed the subpanel. I was thinking THHN but would this mean ...
4
votes
2answers
3k views

Subpanel has neutral and ground bonded in detached structure - should I isolate?

I have a detached garage built in 1979 with a Cutler Hammer subpanel with a 3-wire 8AWG feeder (hot/hot/neutral) on 40A breaker from the main house panel. Subpanel has a dedicated ground rod ...
4
votes
2answers
932 views

How do I wire up a shed for 60A service today with the ability to grow later?

I've been doing my research, reading tons of messages here and on other sites, and I think I know what I need to run power to my shed, but wanted to put it all together and have the collective mind ...
4
votes
2answers
586 views

What conductor and burial depth are appropriate for my garage subpanel circuit?

We are building a 2-story detached garage. The upstairs will be my wife's studio. She is a painter and quilter. The lower level will be a standard garage for tools, etc. I do not plan to weld but who ...
4
votes
2answers
2k views

Does the bare wire in an 8/2 cable connect to neutral or ground at my sub-panel?

I am running electric to a building on my property. i have a 30 amp double breaker at the house panel and have ran roughly 110 feet of 8/2 with a bare ground and installed a ground rod at the sub ...
4
votes
1answer
4k views

How do I convert an existing electrical panel to a subpanel?

I'm going to upgrade my existing electrical service from 100 amps to 200 amps. Along with the service upgrade, I'll be moving the location of the service drop (part of a larger home remodel). I want ...
4
votes
2answers
3k views

Adding second Ground Bus to Square D Sub Panel - Grounded via wire or just the screws?

I have added a sub panel next to my main panel. It is fed from a 100A breaker using 3-3-3-5 CU Service wire. I removed the ground screw to isolate the Neutral and I installed the ground bus that ...
4
votes
1answer
3k views

Arc-fault breaker in sub panel, pigtail to neutral bus or ground bus?

I recently replaced an arc-fault breaker in our subpanel that I thought to be faulty (it kept tripping at strange intervals around when I added a new dimmer, but I found no issues with my dimmer ...
4
votes
2answers
728 views

How can I insulate a stud bay containing a subpanel?

I'm putting a subpanel in the outside wall of my attached garage, which I'm also insulating so I can work out there in the winter. I'm wondering what steps are worthwhile to air seal and insulate ...
4
votes
1answer
247 views

How to separate the outlets in garage from other outlets in the house

The wiring for one of the 15A circuits for my house includes 7 outlets in the family room, several recessed lights, a 3-speed hanging fan, a chandelier in dining room and 3 outlets in the garage. ...
3
votes
4answers
9k views

How can I install an electrical panel when the stud cavity is too narrow?

I am installing a sub panel in my garage and ran into a problem. I have the usual 14" of space in the stud cavity but the problem is that the subpanel I bought is 14 1/4" wide. I'm wondering what ...
3
votes
2answers
482 views

Second 100 amp breaker inside existing 200 amp residential panel for new detached garage

I'm planning to build a new detached garage. My question is can I add a second 100 amp breaker to my existing 200 amp Square D residential panel box? The existing 100 amp breaker goes to my quest ...
3
votes
2answers
3k views

Proper way to wire a sub panel to an attached garage?

I am planning to install a new sub panel in my garage. My concern is following proper procedure/code. I contacted the local building code office and confirmed that they follow the 2014 NEC. My main ...
3
votes
2answers
9k views

Do I need conduit for an indoor sub-panel feeder line?

I'm adding a 100A sub-panel to feed a stove and water heater. The sub panel is indoors and in the same building as the mains panel. Do I need to run the supply feeder in conduit? I'm in Michigan and ...
3
votes
2answers
106 views

Wiring from Main to Subpanel

I posted a question a few weeks ago regarding wiring to a pool sub-panel, and I'm grateful for the wonderful information I received. Since then, I learned a little more about the area between my main ...
3
votes
4answers
16k views

How can I determine if my neighbor is hooked into my meter?

I have several reasons to believe somebody is stealing my power. I decided to flip all the breakers... and behold my next door neighbor's exterior garage light turns off then comes back on but ...
3
votes
1answer
2k views

Adding a new “knockout” to side of main electrical panel

I'm planning on running a 6/3 feeder cable from my main panel to the garage for a small 50A subpanel and am unsure of how to plumb the new cable to the main panel. All of the knockouts are on the ...
3
votes
2answers
1k views

Sub-panel with single ground and common bar - with a twist

I know that this question has been asked and answered before however I have a possibly unique twist. The old question: Does a sub-panel require that the ground and common wires be on separate bars? ...
3
votes
2answers
996 views

Running 240v power to detached garage for electric vehicle

We have a detached garage approx 95ft away from the main house and we are looking to run a 240v circuit there. Currently we have Romex wire running straight into the ground. (This is how it was when ...
3
votes
3answers
3k views

Is 8/3 stranded wire ok to power a 100amp subpanel?

I have an old 220 (8/3 stranded with grnd) line off the main box from a stove that I don't use anymore (we have gas now). I want to use it to install a subpanel in my attic. The subpanel is 100amp, 6 ...
3
votes
1answer
3k views

240V, 40A stove outlet was split into two 120V, 20A circuits, how do I properly isolate the neutral from ground?

I recently been told that a subpanel box that was installed in my kitchen, which previously supported an electric stove, is wired incorrectly. The subpanel takes the 240 line and splits it into two ...
3
votes
1answer
3k views

Can I use my old service panel as a sub-panel when I install a new one?

The main panel in my building is 100 feet from the where the feed wire comes in from the outside meter. Can I install a new 200 amp panel where the feed line comes in and use the existing wire to feed ...