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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26 views

Workshop subpanel with possible solar backfeed

Needing to run power from the residence to the workshop. the need is 220v for the welder in addition to overhead lighting, the run is 375'....what wire and conduit size is needed? If in the future, ...
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1answer
91 views

How do I run wiring to a shed?

I have a building that will be powering 4 shop lights and 4 outlets. Things that are plugged in are air conditioner 110v 5000btu, radio, occasionally air compressor, other power tools(nothing big), ...
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1answer
58 views

Subpanel for finished basement: sizing, cable, installation advice

Thanks in advance for advice! I just finished framing my basement and am moving on to electrical. Hoping for advice on the subpanel. Main 200A Eaton panel is in the garage. I'll need to run cable ...
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1answer
42 views

URD 1/0 wire for 100amp subpanel 60' away from main box

Can I use URD aluminum 1/0, 1/0, 1/0, 4 wire to run a 100 amp subpanel approx. 60' away from my main box? I plan I running it through my attic which in Arizona can get very hot in summer time if ...
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2answers
48 views

Termination point at main panel for a 4 wire feeder ground wire to sub-panel in detached structure

I plan to upgrade an older 40 amp 3 wire feeder to my shop to a safer 4 wire feeder. No issues at all running a #6 solid copper in existing conduit to an un-bonded ground bus-bar in the sub-panel. ...
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1answer
234 views

Bizarre home electrical system

This is a follow up to a question I asked recently about a subpanel that was not wired properly. I'm working on an extremely bizarre situation with the electrical system of an old house that predates ...
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2answers
38 views

Adding a garage subpanel

Currently I have a 200-amp main panel located in the basement. I would like to install a subpanel in the garage. I will use to power my electrical tools, heater, and PC. The garage is part of the ...
3
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1answer
84 views

How can I add a ground wire to my older Square D panel?

This is a Square D 225 amp subpanel, manufactured in 1978. It is located in an old home that predates electricity (originally had knob and tube), and as you can see it has a lot of issues. The grounds ...
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42 views

Can I put two 30A double pole breaker s and a few other 15A breaker s

Can I put two 30A breakers and a few 15A breaker s all in my 60A subpanel ? The pic shows the existing breakers and I want to put one more 30A and one 15 A for a laundry set. Thanks for your ...
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1answer
62 views

Campground sub panel grounding question

I’m involved in maintaining a small campground. Some areas are served by overhead electric and an underground services. No ground wire was ever ran or pulled from the main breaker panels. Individual ...
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1answer
61 views

Subpanel breaker size and wire size

I'm looking to add a subpanel for a basement kitchenette. Here are the power requirements and intended new circuits. Appliance Voltage Amps Slot Circuit Amps Oven/Range 220 28.0 ...
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1answer
158 views

Square D QOC 12 125: Is it possible to bring this subpanel up to code?

I opened up this subpanel for the first time because when I opened the walls for contractors to install floor drains, I found a circuit with four splices that were any/all of: not enclosed in ...
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2answers
61 views

Advice on wiring a pool panel from a subpanel

First things first, thank you to all who are willing to share their experience and knowledge here. I need some advice and or reassurance that I am planning this system correctly. I am going to be ...
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2answers
192 views

How should a sub panel be grounded if next to the main breaker?

How should a sub-panel be grounded if next to the main breaker? Do the ground and neutral need to be isolated (separated) from each other in the sub? Sub-panel will be about 6 - 8 feet away from the ...
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3answers
244 views

How to add a main shutoff breaker to sub panel

I have a 50 amp service line that I'm running to a sub-panel in my outdoor workshop. Rather than plug the service line directly to the buses on the sub-panel, I'd like to add a 50 amp breaker first. ...
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2answers
64 views

270 feet subpanel feed

I need to connect a 100Amp subpanel at a guest house that I am building in the back of my property. My main panel is 400Amps. I need 120/240V at the subpanel to run a couple of mini split ACs that ...
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4answers
1k views

How to use a 100 amp sub panel for a 50 amp input

I'm building a shed I want to add power to. To get power I'm planning to use the power that is going to my hot tub (50 amp). The hot tub has a 50 amp breaker from the main to a 50 amp breaker box ...
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5answers
3k views

GFCI in a 3-wire sub panel with bonded neutral and ground

My detached garage has 100-amp 3-wire service from the main panel in my house, with a 100-amp breaker at each end of the feed. The grounds and neutrals are bonded inside the sub panel due to the lack ...
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5answers
6k views

What type of cable should I bury for a small utility shed?

I'm putting a 8x16 utility shed in my back yard. It will be 100 ft from the service panel. I want to run the supply line under ground. There will be one 4ft fluorescent light and two 120V receptacles....
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2answers
72 views

Do multiple ground bus bars need to be tied on subpanel?

I'm adding circuits to a subpanel. For wiring neatness sake, I'm considering adding a second ground bus bar. Do I need to tie both ground bars together (if so, what size wire), or is screwing them ...
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1answer
68 views

100amp Sub Panel for 75ft - Anything else I need?

to save myself some costs for adding a sub panel, I'm buying the cabling, sub panel, breakers, etc. NIM for an electrician to finish all the connections. I'm going to run the cables, etc. I'm ...
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1answer
178 views

No power to garage

I was replacing an outdoor light and couldn't find which circuit my garage was attached to. Tripped main breaker and garage still had power. I touched the "hot" to the ground to trip a breaker. Power ...
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2answers
96 views

Sub-panel ground and neutral connected to main ground and neutral bar?

I want to connect a RV sub panel with a 50a RV receptacle a 20a gfci receptacle totaling 70a. I have 200a overhead wires feeding a metered box with a 200a main breaker. Connected is a 20a double that ...
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2answers
62 views

Wire Size 100amp sub panel?

Merry Christmas! After lengthy research, still looking for some input. New sub panel in basement. Thinking Square D QO Plug-on neutral. Neutral and ground isolated, adding 2 ground bus bars - bonded ...
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1answer
63 views

Size of 240v service panel breaker

I’m adding a sub-panel to my house about 30 feet from the service panel. There will be two 240 volt circuits in the sub-panel. One will be a 240 v - 20 amp circuit and the other a 240v 30 amp ...
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1answer
33 views

Split sub-panel box with dual feeds? [duplicate]

Is this a thing? Kinda goes with my first question on here. Again i am not an electrician nor will i be doing the work. I am the builder and owner. In the designing stages of a tiny house on wheels ...
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1answer
55 views

Shed subpanel wiring

I have a portable building about 50 ft away the house. I had an electrician come run a feeder to a subpanel in the shed. Looks like he tapped off of my Generac Transfer switch. When I opened up the ...
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3answers
66 views

20A & 30A dual feed into subpanel

Okay so this is my first shot at this question, but not my first time trying to research the subject. I am in the process of designing a tiny house and have started thinking electrical. NOTE : I will ...
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3answers
78 views

Electrical circuits mixed in same conduit

I've got an electrical wiring question. I've got a 100 amp sub pannel close to the center of the house with an EXTERIOR 200 amp pannel of the west end near PSO FEED. I need to add a 30 amp recep ...
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2answers
107 views

Where should the ground wire connect in a new sub-panel?

I have an old style service panel - the ground wire (from a rod in the ground) and the neutral wire (leading in from the pole) are both bonded to the box. I want to install a sub-panel where I will ...
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1answer
59 views

Securing 3-3-3-5 SER at sub panel entrance

When installing a 100A sub-panel with larger wire (3-3-3-5 copper SER), is there a specific size of wire clamp I need for this? Do I use the same type of wire clamp as I would for NM cable, just ...
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1answer
65 views

size sub panel needed for mini house

I have 400 amp service in a 3800 square-foot home. I ran 100 amp to a garage. I want to build a mini-home that will require approximately 130amps in appliances, etc. What size sub-panel do I need? ...
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1answer
46 views

Partial Power Outage No Breakers Flipped

Reading other similar posts, I called an electrician friend (doing a favor, not on the clock), who checked the main breaker, it was fine; he checked GCFI's, one wouldn't reset but he said it wasn't ...
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3answers
215 views

Wrong installation of tandem breaker for 240V burn water tank

My contractor installed water tank https://www.homedepot.com/p/Rheem-Performance-50-Gal-Tall-6-Year-4500-4500-Watt-Elements-Electric-Tank-Water-Heater-XE50T06ST45U1/205810674 and it ran for a short ...
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0answers
42 views

100 Amp Sub Panel in basement garage from 200 Amp Main in the upstairs garage

I have a two story garage. The bottom garage is below grade on 3 sides. The upstairs garage has its own 200 AMP main service. I will be running wire from the main via 100 amp breaker to the sub panel ...
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2answers
119 views

Can I use 12awg ground from main panel to subpanel?

I recently rebuilt a shed that had electricity run to it in the past. There are wires run from the main panel to the shed underground. The old shed used 12 gauge black, white and green wires. There ...
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1answer
42 views

Adding a Sub-Panel to 3-Phase Main

So our building has 3, 3 Phase 200A 120/208 I-T-E Indoor Load Centers, each on their own meter. Originally the building was built for 3 suites, 3 tenants. We have the entire building, so we have all ...
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1answer
107 views

Replace wire to 60A subpanel

Short Version: Anything wrong with running 6/3 NM in a joist well to a junction box that leads out to a 60A garage subpanel? Longer Version: I'm thinking of finishing a room in my basement. It has a ...
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4answers
149 views

Upstream or downstream breakers for sub panel

I have "recently" created an addition to my house here in CA. The original house had a 200 amp manual transfer switch for a backup generator, but this only feeds the old part of the house via a 100 ...
4
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1answer
647 views

Confirming the set-up and wiring of 60AMP subpanel

I am installing a 60 AMP sub-panel (GE TLM2412CCUP) and want to confirm the wiring and set-up before I set everything up. The pictures show the main panel (currently 60AMP as well but will be updated ...
3
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2answers
170 views

Running 100 amp line to detached garage

I found lots of questions about this, but with many different answers. I'm looking to run a 100 amp line from my 200A main breaker box to a subpanel in my new detached garage. The run is about 120 ft....
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1answer
66 views

Wiring a subpanel next to main in finished wall

I'm putting in a 100A subpanel next to the 200A main to add some more outlets for the garage. The walls are finished and the main is flush mounted in the wall so I plan to do the same with the ...
4
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2answers
384 views

Options for installing sub-panel

we are thinking about the best way to rewire our kitchen. It had 2 circuits when we moved in. We managed to add 2 circuits using an existing 3/4'' conduit that goes from the basement to our third ...
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1answer
112 views

Flush Mounted PVC Electrical Junction Box or alternative ideas to supply two sub-panels

I'm not an electrician, but I am a pretty aggressive DIYer that wants to do things the right way (i.e. I plan on getting a permit and everything inspected but I need a gameplan first). I have a ...
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2answers
91 views

Wiring a shed/workshop

Hoping to wire up a shed/workshop with two 15 amp circuits coming from a 60 amp sub panel beside the main panel. Wondering what type of wire I can use in PVC conduit and if it should be GFCI protected....
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1answer
47 views

New sub panel wire sizes

I would like to install a small sub-panel in my basement. It will be approximately 55-60 feet from the main panel. I will be running a fridge, some fluorescent lights, and occasionally some small ...
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2answers
378 views

Wire a sub-panel to run a pottery kiln, or put a breaker in the main panel?

Pretty beginner on electrical. I have a 100 amp service (metered not against or adjacent to main dwelling - somewhere central in our mobile home court) with a 125 amp main box. 1300 ish sq ft, 3 ...
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0answers
44 views

Run 12/3 through insulated wall to surface mounted electric panel

Should/can I run the 12/3 wire inside the wall or just run a conduit up to the attic? The project: I want to install split receptacle 20 amp outlets in my garage. The subpanel in the garage is ...
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0answers
34 views

What wire size is needed?

I need to run 110 volts AC 300' to a subpanel. What size copper wire do I need? Wire will be run in conduit underground.
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1answer
82 views

backup electrical feed to main panel from inverter's GFCI outlet without ground?

I have rigged a 1000watt/120vac inverter to my EV, to use for backup electrical power during short grid outages (the main "traction" battery has 40kwh and the DC-to-DC converter is known to be able to ...

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