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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).

2
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2answers
70 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 ...
0
votes
3answers
56 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 ...
1
vote
2answers
64 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 ...
0
votes
2answers
49 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. ...
1
vote
1answer
25 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 ...
0
votes
1answer
32 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 ...
1
vote
1answer
72 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 ...
1
vote
2answers
97 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 ...
1
vote
1answer
52 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 ...
1
vote
2answers
96 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 ...
0
votes
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 ...
0
votes
2answers
191 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 ...
1
vote
1answer
114 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'...
2
votes
2answers
143 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 ...
2
votes
3answers
200 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 ...
0
votes
1answer
38 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`...
0
votes
1answer
116 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 ...
1
vote
3answers
128 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 ...
2
votes
2answers
61 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 ...
1
vote
0answers
68 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 ...
2
votes
1answer
61 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 ...
1
vote
0answers
117 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 ...
14
votes
2answers
1k 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 ...
3
votes
4answers
210 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 ...
0
votes
1answer
98 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 ...
1
vote
2answers
82 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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0answers
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.
1
vote
1answer
157 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 ...
0
votes
1answer
81 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 #...
1
vote
1answer
115 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. ...
1
vote
3answers
103 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 ...
1
vote
2answers
161 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, ...
2
votes
3answers
256 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. ...
1
vote
1answer
597 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). ...
0
votes
2answers
201 views

How do I go about installing a subpanel on wood paneling that's mounted to a concrete wall?

I've been reading, researching, watching, and preparing to install a sub-panel (which I'll be having a licensed electrician inspect and sign off on before going live) and I think I know how to go ...
2
votes
1answer
238 views

Need advice about rewiring detached garage

I have an old house (1955) with two overhead wires going from the house to the detached garage (15') where they connect to an old fuse box (picture) My first question: how does this work? Two wires ...
0
votes
2answers
42 views

Wiring the out building

I have 2-2-2-4 AL dyke quadruplex direct burial 600v. with AC/heater wall unit. with about 9 plugs. a small hot water heater. and 9 can lights. is a 60amp breaker big enough. Also the wire is running ...
2
votes
1answer
294 views

Is it bad to have a circuit breaker on both ends of a feeder?

My main service panel only has a single breaker connected to a feeder wire which goes to my subpanel. I'd like a main disconnect closer to my subpanel so I don't have to go all the way to my main ...
2
votes
3answers
3k views

wire size for a 150 amp sub panel from a 150 amp breaker added to a 400 amp main panel

I have a 400 amp Siemens main panel it has a 200 Amp breaker to the house and a secondary 150 amp breaker added to run power to a metal building approximately 150 feet from the main. what size wire ...
7
votes
5answers
4k 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 ...
0
votes
1answer
55 views

tankless water heater

I am looking at adding a tankless water heater but I don't have enough spaces in my breaker box for the breaker requirements of the heater. It is asking for 3 double pole 40 amp breakers and I am ...
0
votes
2answers
142 views

Does the metal receptacle box for 6-30 NEMA need to be grounded?

I have a 240 VAC portable heater with a 6-30 NEMA-style plug. I am finishing the 3rd floor of our house. I installed a sub panel fed with a 50A service using 6 AWG THHN. Installed a 30-amp 2-pole ...
0
votes
0answers
59 views

What size wire should i use for a 125 foot underground run to a garden shed

I want to run a buried 125' line to a 30A subpanel in my garden shed. I will only be running hand tools and lighting. Was planning on using 12/3 from the house to the subpanel. Does that sound like ...
0
votes
1answer
55 views

Need to add a sub panel

Moved here a few months ago and the heat pump is junk. It has a 100 amp breaker out of the main box. Thought about putting in a sub panel off of this breaker. Looked at the wire and it is a 3 wire (...
1
vote
2answers
125 views

Correcting Electrical Subpanel With Two Unsheathed Hots Going Back To Main Panel

I have a small subpanel fed from my main panel. The subpanel has two (unsheathed) hots (from separate breakers) exiting the top, going back into a wall cavity and then back to the main panel where ...
0
votes
2answers
114 views

can I turn a spa panel box into a circuit breaker box

I got rid of the hot tub and have 60A spa panel. Can I purchase guts that would make it a breaker box? Or should I just replace it with a circuit breaker box? I want to run power to my shed. Is it ...
0
votes
1answer
107 views

Breaker for my subpanel for the pool keep tripping

I have a pool with a sub panel that has a 30amp breaker for the pump, a 20 amp for the lights that is also connected to a small fridge receptacle, the water heater has two 20amps on it. The main ...
0
votes
1answer
132 views

Running wire to subpanel

We went to Lowe's and we unfortunately took the input of the gentleman helping us, he stated he had experience in electrical work and when we told him that we wanted to run wire to a subpanel in the ...
2
votes
1answer
57 views

Safest way of temporarily working with a failed 4-wire outbuilding subpanel (one missing hot leg, neutral bonded ground on both ends)?

This is actually a multi-pronged question. I will ask it all and split out what I can as needed. I am renting a remote out building in a rather rustic location on a farm. The power situation here was ...
0
votes
2answers
326 views

Best choice for sub-panel and circuits for basement

Can anyone help me spec a sub-panel for a basement renovation? The plan is to run a 6/3 AWG feed from a 60A breaker in the main panel to a sub-panel which will be flush mounted in an interior stud ...