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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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Garage/workshop

Trying to figure out what amperage I can run to a subpanel to a newly built detached garage. It is a 576 square foot shop (24x24x12). My home has a 200amp service panel form the meter. It currently ...
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2answers
67 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 ...
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1answer
24 views

Wiring a compressor to an external building

I have run 2,2,2,4 in conduit underground to a 100amp box. In the house the ground an neutral are bonded together but in the shed they are separated(isolated). I'm connecting a compressor through a ...
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2answers
34 views

Metal or PVC Conduit in Metal Outbuilding?

I'm running wiring under ground from main panel to 100 amp panel in metal garage. When installing lighting and receptacle circuits mounted against interior walls, does it make any difference what ...
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3answers
74 views

Turning 100A Main to subpanel of 200A new main

I have a 100A old-style circuit breaker main (~1970, 2 conductor & ground) in the basement. I want to upgrade the circuits in the garage to allow for solar panels and PEV cars, so my thought ...
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1answer
69 views

How to wire main feed in a tiny house subpanel for 120v and 240v?

Initially, I'm going to be plugged into basic 120v from an outlet. However, I'll be moving in a year, and want to be able to plug into 240v if available. How to achieve this flexibility in the ...
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74 views

Adding sub panel, odd main panel configuration

I am in the process of adding a sub panel to a detached garage and I have the proper gauge wire connected up to the sub panel (neutral and ground NOT bonded) with 3 conductors + ground running in ...
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47 views

What size and type of wire do I need?

We have a 200 amp service on the pole. We want to run to a subpannel in the house. What size wire do I need to run from a 200amp meter pannel on the exterior pole to the subpannel in the house? The ...
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2answers
48 views

Other than unforeseen surge in draw, what can cause breaker tripping?

My house originally had a single main panel, 150A. Some years ago, I decided to split the basement apartment and the main unit. The original main panel is in the basement but I wanted the main unit to ...
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24 views

Sub panel box not getting power

So I drilled through a wall and my sub panel was on th e other side and hit a wire but didn’t puncture the wire just grazed it and lost all power only in my unit none of my breakers tripped or none of ...
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1answer
100 views

Yes, I'm dumb - I drilled into wall backing my electrical panel

so... I was drilling into a wall and the drill was having a hard time. I figured I just needed to keep going and I did and it finally went through. Afterwards I realized my electrical panel was ...
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60A sub panel located 220' from source…in conduit..what guage al wire to meet ONT Elec code?

I want to wire a 60A subpanel that is 220' from the main source. The wire will be AL and run through a buried conduit.... Must meet Ontario Electrical code
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2answers
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Powering Subpanel from CSED via Feed-Through Lugs

I'm wiring my house and would like some feedback on the sizing and routing of conductors between the exterior service entrance and an interior subpanel. On the outside, I have installed a combination ...
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2answers
208 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 ...
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3answers
200 views

Can I install a 60A main breaker in a load center rated for 125A?

Following my previous question about feeding a sub-panel... I have access to a new-in-box 125A load center, which is more current than I need, but the form factor is good. Can I drop to a 60A feeder ...
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Service needed to add a tankless water heater

I am currently building a detached 250 sq feet studio in my backyard. The studio will have a tiny bathroom with a tankless water heater, a baseboard heater, and a few lights, a mini split (ac), of ...
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2answers
106 views

Question about subpanel install in a shed

I am not an electrician, so let's get that out of the way. However, in the past I have installed simple subpanels in detached buildings and had my electrical work inspected and passed first time, so I ...
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3answers
66 views

Old Fuse Box Used As A Subpanel

Home built in the 50's has a fuse box that's currently being used as a subpanel in the garage. The garage is attached to the house by the means of a 8 foot wide enclosed breezeway/mudroom. My problem ...
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2answers
92 views

Single neutral bus bar in subpanel with 2 columns of breakers?

(Questions in bold at the bottom) I recently purchased a Siemens E0816ML1125S load center for use as a subpanel in my basement: I installed a ground bus bar, located horizontally under where the ...
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2answers
59 views

2 pole 240v AC circuit breaker wire connections

If the neutral is not needed on a 2 pole 240v AC circuit to what should it be connected? My new oven has a black, red, ground, and a white wire. The wire from the circuit breaker has the same 4 wires. ...
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1answer
54 views

Add sub panel from transfer switch

I'd like to add a subpanel to add a couple circuits (Extra inverter Mini Split ACs, well pump, etc.) but my main interior panel is full and recessed in concrete. I added a manual transfer switch from ...
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1answer
79 views

about NEMA 6-15 plug/receptacle for 240 V

The NEMA 6-15 plug/receptacle for 240 V power supply looks like the following: https://en.wikipedia.org/wiki/File:Nema_6-15.svg The two hots obviously should be connected to the two hot wires in the ...
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1answer
77 views

no ground bar in electrical subpanel

I found that the subpanel in our newly built home may not have ground bar, though it has neutral bar. I attached photos for confirmation. Please let me know if there is any code violation. The house ...
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2answers
109 views

Should the ground lug be bonded in my sub-panel?

I have 200 amp service at the house. I want to install a DP 60 amp breaker in that panel and run # 6 wire approximately 150 feet (10% added for swag) overhead to a dog rescue building. The building ...
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1answer
119 views

Is a Redundant Ground at Sub-Panel Permitted? Useful?

I've searched the forum and haven't found an answer for this exact situation. Here's the configuration: Main 200A service panel at one end of house (exterior), and 100A sub panel at opposite end of ...
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2answers
162 views

Installing a sub panel to a GE split bus panel

I want to install a sub panel to my GE split bus panel. The diagram indicates that I could replace the two full sized 2-pole breakers (2 inch wide each) on the upper left with three compact 2-pole ...
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1answer
85 views

How can I connect a sub-panel to an unused 60A breaker in another panel?

So I have a contractor installing a gas furnace where I used to have an electric furnace. I am ending up with a 60a circuit that is not needed anymore. I want to take that circuit and install a ...
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2answers
700 views

100 AMP sub panel from 200 AMP main

Installing a new sub panel in my detached garage, about 90' from the main panel. Half of the distance of the run will be under the house and the second half underground to the garage. I have read that ...
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1answer
149 views

Should I make space for a new 50A breaker in a full panel or install a sub-panel?

I'll start by saying we just bought a fixer-upper house. I searched the topic of adding sub panels and a lot of the answers are a bit over my head so I need some advice. My house was built in the 20'...
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2answers
265 views

Is it possible to make space for a double-pole breaker in this panel?

I need to add a 90A double-pole breaker to the service panel on my house to feed a subpanel in a detached garage. It is a GE that uses Q-line breakers. Looking at the current layout, I'm not sure it ...
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3answers
364 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 ...
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1answer
39 views

Calculating sub panel capacity

I am creating a sub panel which will contain 20, 20 AMP circuits to provide power for 20, 1,000 watt, 120v stage lights. My calculations suggest that the light loads, which are constant, will require`...
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1answer
191 views

What type of wire and load center for subpanel in detached pole garage?

I am installing a 60 AMP subpanel in a detached pole garage 150 feet from the house. Garage subpanel will be supplied from an existing 100 AMP subpanel in the basement of the house (running from the ...
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3answers
235 views

Adding a sub panel in my basement

I want to add a sub panel in my basement. The main panel is in my garage, the next level up. The distance from the main panel is roughly 10 feet. The main power comes in through the basement and up to ...
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2answers
67 views

Move grounds to subpanel when I moved 8 single pole breakers to same subpanel?

When I move 8 breakers from main panel to a subpanel (a few feet away) can I simply move the hot and neutral only to subpanel? The 8 breakers are grounded in the main panel already. A 100 amp breaker ...
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81 views

Questions about installing an electrical subpanel (re: wire size, etc)

My current electrical panel is filled and I'm going to have a pool installed this year so I need to install a subpanel. (my current box doesn't support tandem breakers, etc) Because I only need more ...
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1answer
79 views

Does a sub-panel require its own local main breaker?

When one goes to install an electrical subpanel is it required to install a "main" breaker in the subpanel to shut off all the circuits in the panel? Or is it sufficient to just have the feeding ...
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240 views

Wiring 100 Amp subpanel

I know this subject seems to be debated to no end but I have a few questions/comments. My main service panel is in my attached garage and I want to add a 100 amp subpanel about a foot or 2 to the ...
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2answers
2k 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 ...
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4answers
436 views

Space requirements for first subpanel and wiring preference

I would like to install two subpanels and my main panel is full of breakers. Would it be better to feed both subpanels directly from main or have 1st subpanel off main and 2nd subpanel off 1st ...
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1answer
112 views

Installing a sub panel

Installing a sub panel solely for outdoor Christmas lights/decorations. I will need approximately 120 amps now, with more to be added later. My current main panel does not have enough open slots for ...
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2answers
100 views

Should the neutral be bonded in my barn's sub-panel?

I moved into a house with a barn. The barn has a 100 Amp panel. It feeds from a Main Entry 100A breaker in the Entry's box. There are 3 wires to the sub. Ground and 2 hot. The subpanel in the barn ...
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26 views

Installing 60 amp sub panel [duplicate]

I'm installing a 60 amp sub panel in my garage. What size wire and what size conduit should I use? The distance is 60 ft.
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1answer
302 views

Fastening THHN cable in junction box

I am installing an electrical subpanel in my garage and have a 2" PVC conduit run up approximately 5 feet from the panel through the ceiling to the garage attic. In the conduit i ran 2 12/2 NM romex ...
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1answer
109 views

Can I use #6 wire to feed a sub panel off main

I have a 200amp service, thats loaded with twins, my son just bought house, anyway I want to put a 100amp sub panel inside basement off the main panel, the run is nomore than 20', I have about 50' of #...
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1answer
168 views

Adding ground to replacement sub panel

We recently purchased a new home that has a 16 x 30 steel building in the back yard approximately 100ft from the main panel. The building has power run to it off a 60 amp breaker in the main panel. ...
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3answers
110 views

Can the Distance of a Subpanel affect Outlet Tester Results

I got help with wiring my cabin here: Requesting Evaluation of Power Plan at Rural Cabin and here: Cabin Wiring Plan Revisited I also put a follow up comment there, but now I'm not sure that was the ...
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194 views

Cabin Wiring Plan Revisited

OK, So I’ve update my wiring plan … see images. I have more details now, such a part numbers, specifications and ratings, etc. I’ve consolidated much input from a couple of forums as well as Stack, ...
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3answers
384 views

Is this double tap for a subpanel a problem?

I've been reading posts but am still a little confused on this as each situation is slightly different and I am not familiar with the terminology. Main breaker has two larger wires coming into it. ...
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1answer
2k views

Can I use a 30A backfeed breaker when I'm not using the generator?

I have a panel in my garage with a "Generator" 30A breaker. I know I shouldn't be backfeeding the generator (I inherited this setup and am scheduling an electrician to put in a transfer switch). ...