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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2
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2answers
207 views

Can I feed a sub panel off my 200A service box? Or would I need to run wire from the inside breaker box?

Can I add a sub panel feed off my 200A service box? If so what are the requirements? Or would I need to run it from the main house breaker inside the house and wire from there? I currently have a ...
1
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0answers
34 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 ...
3
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1answer
148 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 ...
0
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2answers
136 views

3 wire existing feed, not connected to main panel. Do I bond ground and neutral

I have a detached garage that has a 3 wire feed, powered from a separate 100amp disconnect from the main panel. Originally the old box had the ground and neutrals together on the same bar. I ...
1
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2answers
176 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 ...
3
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2answers
57 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 ...
1
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2answers
405 views

Where Should the Sub Panel Go? What Size Wire?

Been lurking for awhile getting ready to install a 60 amp sub-panel for my back yard. I have everything I need figured out except for three important items as I get conflicting stories depending on ...
15
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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 ...
13
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3answers
153k 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 ...
4
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3answers
9k 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 ...
3
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3answers
227 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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1answer
61 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 ...
2
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2answers
61 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 ...
0
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1answer
54 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 ...
2
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4answers
130 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 ...
1
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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 ...
7
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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 ...
1
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1answer
209 views

30Amp Sub Panel for EV Charger

Need 240V 20AMPs in detached garage for 16 AMP Level 2 EV Charger (Chevy Spark) at my MIL's home. 1200 sqft House, has a 100 AMP Panel. Furnace, Dryer, and Stove are Gas. All circuits are 20AMPs, and ...
17
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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....
0
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1answer
174 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 ...
3
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2answers
71 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 ...
1
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1answer
129 views

Wiring a new shop advice

I am having a new shop built on Friday.The shop is located 250 feet from my power meter. For a 240 volt 100 amp service in the shop, the online calculator says I need 2/0 AWG Aluminum or 1AWG copper....
1
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1answer
54 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 ...
0
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1answer
64 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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2answers
82 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 ...
3
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2answers
22k views

Conduit Size for Sub-Panel run?

I have old overhead wires that go between my home and a detached garage. The plan is to remove the overhead wires and install a new sub-panel in the garage with an underground (PVC 80) run between the ...
1
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2answers
58 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 ...
0
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1answer
103 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 ...
3
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2answers
100 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 ...
1
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2answers
357 views

Is a 60 amp breaker adequate for a 240v sub-panel to my garage?

150 panel in house. I want to run a 240 (sub-panel) feed to garage 25 feet away for 10,000 watt electric heater. There's room in the 150 panel. Would 60 amp breaker in the garage meet the 1.25 safety ...
0
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3answers
64 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 ...
2
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3answers
62 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 ...
0
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1answer
27 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 ...
1
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1answer
117 views

Basement Sub-panel Breaker Size

I am confused about small-appliance branch circuit for service load calculation. I am trying to size my breaker for a sub-panel in my basement from my main 200A panel. I will have a main room, wet ...
1
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1answer
55 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 ...
1
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1answer
279 views

How to handle unattached ground wires in boiler fusebox/control panel (sub-panel?)?

I don't have enough of an understanding of HVAC to know if the pictured boiler fuse box is considered a control panel or a sub-panel - but some wiring issues there lead me to needing to understand ...
8
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2answers
48k 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 ...
3
votes
2answers
164 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....
0
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1answer
1k 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
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1answer
90 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 ...
2
votes
1answer
168 views

What size sub-panel and wire do I need for my three-season room?

I have a 15x22 room that is roughly 50' from the main panel, that I am converting from a 3 season room, into a conditioned space (heating and cooling, enclosed with windows and doors, etc.). ...
3
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6answers
43k views

Grounding requirements for main panel and subpanel

I recently had my main service professionally upgraded to 200A and had a 60A subpanel installed in my master suite to support future additions. All work passed city inspection, for whatever that's ...
3
votes
3answers
176 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 ...
1
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2answers
114 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 ...
0
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1answer
45 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 ...
0
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0answers
40 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 ...
1
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1answer
38 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 ...
4
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1answer
361 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 ...
1
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2answers
752 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 ...
0
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1answer
3k 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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