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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1answer
69k views

What size wire do I need for a 100amp underground 300 ft run?

I want to put in a 100amp subpanel in my garage. The run will be underground and 300ft long. I have a Siemens panel with breakers rated at 60/75 deg C. What is the proper wire size I need? I was ...
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0answers
47 views

Installing a 100 amp sub panel in 3rd garage. Finished ceiling with no access above where main panel located. Looking for suggestions [closed]

Want to run 100 amp sub panel from my 200 amp sub panel located in main garage that has a finished ceiling with no access above. 2nd garage has access above. Any suggestions? Thanks
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2answers
76 views

12/3 underground to garage multiple 14/2 wires to bare 12/3. No ground rod anywhere around 14 x54 detached garage

I've been in this house, built in 1941, for two years now. I've been working on replacing very old wiring in the basement for some uncomfortable issues I've found. But these issues pale in comparison ...
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1answer
58 views

How to enter surface-mount main panel from back w/ a 1/0 Al SER cable?

I need to bring a 1/0-1/0-1/0-2 AL SE cable from a 2x4 wall into the back of the main service panel (it is a new subpanel feeder). The main service panel is surface-mounted on the outsde, on the ...
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1answer
59 views

Wanting to add a ground wire for a sub panel replacement. Would like to use use nearby EMT

Updating electric in an attached shop. There are two sub panels, both fed 240 from the main panel in the house. The one has large aluminum conduit, with the conduit serving as ground. The smaller ...
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1answer
568 views

Another sub-panel question

Improving unfinished basement in 7 year old log home to have a small shop and a mancave Installing sub panel 40 wire feet from main panel mainly because i don't want to home-run all my circuits to the ...
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0answers
56 views

Wire questions for panel, sub-panel and electric vehicle charging

I live in an apartment in a 60-apartment building. Each apartment has a 125 amp sub-panel in it (I'm assuming it's a sub-panel). I have 3 slots open on my panel. I wanted to install a double-pole ...
5
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3answers
440 views

Ground wire pass-through safety switch to sub panel?

I have an out-building 150+ feet from the main service panel with its own 240v 60 amp sub panel. It is powered via a four wire bundle going through underground conduit -- 2 x 120v feeders, 1 neutral, ...
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2answers
166 views

Thinking about replacing old fuse box. Looking for advice

In my detached workshop/garage, I have an old fuse panel servicing that building only. I am thinking about switching it out with a new small breaker panel. I have been reading everything I can find ...
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0answers
63 views

Adding a sub panel in my high tunnel greenhouse

ADDING A SUB-PANEL IN MY HIGH TUNNEL GREENHOUSE I need to add electricity to my new greenhouse that will be powering my exhaust fan and shutters, the automated roll-up sides, a couple of small water ...
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1answer
170 views

Hot tub wiring plan - does my plan check out?

I'm looking for feedback on my electrical plans for a hot tub install. The space is in a 7 unit building located in NYC. The apartment is owned, not rented. I am planning on hiring an electrician for ...
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1answer
85 views

Dryer & Stove share breakers in 1972 apt

Question1: Why would one hot from the stove be wired into the dryer breaker and one hot from the dryer be wired into the stove breaker? Each has a separate neutral and both are grounded with their ...
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3answers
95 views

What size subpanel and wire do I need for a swimming pool?

I need to install a 100A subpanel for an in ground swimming pool. The main panel is in the garage and subpanel will be mounted on exterior of house about 30’ away. The subpanel will be more than ...
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3answers
19k views

How do I know if I can run power to a garage from my breaker box?

My breaker box is a 200 amp service. There's 16 openings and only 1 blank space for a new breaker. I have a garage about 100' away from the house that I'd like to run lights and a few plugs for tools ...
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1answer
777 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 ...
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1answer
99 views

Can I Replace This Junction Box with a Subpanel?

In the 1950's, our house was built with a Zinsco main service panel that ultimately served six two-wire (ungrounded) and two grounded (via AC/BX) circuits. In the 1990's, a new service panel was ...
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19 views

Routing SER cable through a subpannel/junction box without making splices?

Due to other constrains I may need to route a SER cable feeding a remote subpanel via a junction box (or another small subpanel for convinience). This junction box will be connected back to back to a ...
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2answers
131 views

Can I use an existing Ground Rod for Sub-Panel in Detached Garage (Meter box is using the rod currently)

Two buildings: Home and Detached Garage (circa '04 US). Service comes in through a Meter on the Garage to a PVC conduit into the Main box in the home (Single phase 240V with Neutral). In the main box ...
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2answers
94 views

Neutral and ground seperation at a sub-panel

Could someone explain to me why the neutral and ground bars are never bonded on a sub panel? It's my understanding that the reason they're separated is so that the current returning on the neutral ...
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2answers
65 views

Can I run power to a shed from 110v 30 amp external house outlets 20 feet away using RV 30 A Extension Cord?

My house has two utility 30 amp outlets (with 30 amp breakers at the main panel). I want to use from the house outlet, 30 Amp RV Extension Cord going into a 30A 125V RV Power Inlet (to be installed ...
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1answer
51 views

What size wire for my 240 v 50 amp sub panel

I am running a 240 v 50 amp sub panel to my pole barn. It is about 125 feet to the barn. I an just running lights on 15 amp circuit and outlets and garage opener's on 20 amp. I figure i might need the ...
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2answers
88 views

Can I use an existing 6/3 cable plus an additional ground wire for a sub-panel?

I am installing a sub panel for a kitchen remodel. I have an existing sub panel directly below where I plan to install the new sub panel. The existing sub panel is fed off the main breaker box with an ...
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1answer
132 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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2answers
85 views

What size wire for a 100A sub-panel at 275 feet?

I need to run power from my house out to my 35X70 workshop out back. What I have; a dedicated panel with 150 amp breaker on the side of my house that is currently only powering my well. My workshop is ...
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2answers
128 views

Advice on running power to a shed

I have a 200 amp service panel, and I calculate I am using about 160 amps. (I used a formula I found online that takes the square footage of the house and then adds from there) The new 160 sqft shed ...
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2answers
70 views

How do you properly use metal conduit as a ground?

I have read here that metal conduit can be used as the ground and you needn't then pull a separate ground wire: What are the NEC rules governing this? How do you avoid "weak ground" links ...
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0answers
38 views

Wire gauge needed for outbuilding with welder

I have a standalone building that I'm going to start welding and doing other metal work out of. When looking over the current wiring I came across a wild shock that all I could do was laugh. The ...
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2answers
45k views

What wire type & size for sub-panel in a shed?

I need to install a sub-panel in a shed. Total run distance from main panel to sub-panel is 80 ft and includes three 90 degree turns. Burial distance will be 18". I'm thinking to install a 60-amp ...
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3answers
546 views

Should I run RMC all the way from panel to sub-panel, or are there cheaper options?

I am running a 60 amp circuit to a shed about 100 feet from our main panel. I'll be running 3 #6 copper wires in a 3/4" rigid metal conduit down a trench with 6 inches of cover (hand dug, and I ...
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3answers
1k views

Are there safety concerns or code violations with my garage sub-panel?

I recently bought a home and the garage has this sub panel that looks questionable to me. The garage has a circuit for 240v, and two other circuits that consists of two 120v wall outlets, and two 120v ...
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3answers
70 views

Move neutrals to subpanel or leave them on main?

I have a 150A Square D QO panel that is full and won't allow for tandem circuits. I'm going to take out the bottom 2 breakers and replace them with a 100a breaker to feed a subpanel via 4AWG copper ...
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1answer
150 views

Adding a 110v circuit off 220v spa wiring

I have a hot tub installed with 4-wire 50 amp service, with the GFCI 2-pole breaker at the main panel, and a simple non-fused pull disconnect switch subpanel near the hot tub. I want to split off a ...
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1answer
115 views

Grounding for sub panel breaker

We have an old cabin with 4 fuses in the main 60 amp panel, and a sub panel with a handful of breakers. The sub panel is fed by 3 wires instead of the modern 4. The 4 fuses are all wired with 2 wire ...
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3answers
144 views

How to wire subpanel back to back for portable generator

I bought a 12Kw Pulsar G12KBN portable generator with a 50Amp outlet to power my house and my 4ton AC during Louisiana storm seasons (last year we had 6 storms) and I'm looking for best recommendation ...
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1answer
54 views

Two Separate Electrical Services (Meters), Disconnecting One and Making Subpanel

The property I've been renovating has two separate meters. One on the house and one on a detached garage that used to be an automotive shop. I recently upgraded the house to a 200amp service (has ...
2
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1answer
40 views

Sub Panel feed to existing garage

I am wanting to upgrade a garage by putting in a larger 10 space sub panel with a 60 amp feed from the house. I plan to use a 4 wire assembly of #6 copper USE-2 conductors direct buried from house to ...
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0answers
25 views

Main to Sub to oven w/ detours

I have owned the house I’m living in for 20 years. There’s a subpanel in the back yard where a spa used to sit. It is fed by a 50-amp breaker in the main service. I got rid of the spa and I built a ...
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1answer
138 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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0answers
69 views

Is there a way to add a sub panel to my detached garage?

My main panel is full and I am trying to get electric in my detached garage with a sub panel but am unsure of any ways to do. My current main panel is an old Pushmatic and I’ve seen tandems for it but ...
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2answers
147 views

Add a 80/100 amp subpanel to 125 amp main, or upgrade service/panel?

I have a 125 amp main panel (configuration below) for my 1250 sq ft, 2 story townhouse, and want to update my kitchen outlets have dedicated circuits for fridge, dishwasher, garbage disposal and ...
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1answer
77 views

Power issues in out-building sub panel - What's the best way to repair?

I am having electrical issues in my out-building shop. I think I might have an idea of what is wrong, but I want to hear others opinions, and I also want to know the best method of repair. I will try ...
2
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1answer
397 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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2answers
54 views

Can I run two sets of 10/3 30amp wire to feed one panel?

I have a shed that I want to supply power too. Can I run 2 sets of 10/3 30amp cable to one panel? Or does each cable have to have its own panel? Approximate wire length will be 45 foot. I already ...
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0answers
33 views

What 110V breaker to use to supply a 220V supply to a 100A sub-panel

I have a shed that is wired for the following : two 110V lights, 2 110V outlets + a 220V outlet for a Welder (60A). I am trying to figure out what size breakers to use to supply power. I will be ...
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5answers
2k views

subpanel breaker tripped as well as main breaker - should I be concerned?

All... My garage had only one outlet so I extended it using surface raceways. Like a dummy, I did not turn off the breaker when I started the installation of the raceway. "I know what I'm doing ...
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2answers
2k 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
47 views

Should I Install a sub-panel, IN PLACE OF of an unused hot tub disconnect, for a basement project, and will I need to change the main breaker?

I have removed the hot tub disconnect and pulled the 4 wire (6G) back into the basement. This line comes from the main breaker panel on a 2-pole 50A breaker. My plan is to instal a basement sub-...
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1answer
171 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 ...
2
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1answer
810 views

Junction box above ceiling to add second sub panel from existing sub panel feed

I'm posting this question to determine if there is a safe manner to do this that meets code and isn't a redneck solution. The sub panel in my garage is run off a 50 amp breaker that is in my service ...
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3answers
78 views

What's the current input from each leg of a portable generator into my main panel?

I am connecting a portable generator to my electric sub-panel in my garage. My generator is a 6kw running watt unit with a 30amp 220 volt output. I will be using this connection (L14-30) to a box ...

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