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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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
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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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 ...
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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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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
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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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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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
93 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
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
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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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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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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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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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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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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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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3answers
94 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
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
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 ...
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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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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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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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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 ...
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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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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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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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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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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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1answer
80 views

What size wire and pipe for a 125A subpanel in an attached carport?

I realize this/these questions have been asked a million times before on this forum, but I appreciate any help that will help me drill down on exactly what materials I need and what I need to do. ...
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1answer
74 views

Max amperage for “neutral tie strap” in daisy chained Siemens panel

200 amp service. We have a service disconnect upstream of our main panel, which effectively means our neutrals and grounds are still isolated in our main panel (as one does when setting up a sub panel)...
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2answers
100 views

Can I convert 2 two-pole 60A breakers into 3 two-pole 40A breakers

Considering a new electric tankless water heater. But my 18yr old existing subpanel doesn't match what most new heaters use. Any help on the best way to go about this would be great. TIA UPDATE: ...
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35 views

Prep for installing sub panel in attached garage

I recently built a three car garage attached to the side of my house with a slab on grade foundation. It replaced an earlier single car garage built in the 1920s that was detached and about 15' from ...
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2answers
602 views

Sub panel install issue

I had a sub panel installed recently. The plan was that i will be installing my own breakers. The sub is running off of the main about 25 feet away in my garage. I understand that the ground and ...
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0answers
31 views

240V on all 120v outlets and ceilings lights [duplicate]

In a remote studio have a Sub-Pannel with Multimeter readings. With No Circuit Breakers In Place (L1 to N 120v) (L2 to N 120v) (L1 to G 120v) (L2 to G 120v) (L1 to L2 240v) (N to G 0v) slim type ...
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3answers
561 views

Where do I attach the Ground and Neutral inside a sub-panel?

I'm wiring 100 amp subpanel to detached Garage with 2/2/2/4 copper. I'm hoping to replace the subpanel to my detached garage which was previously wired to run on a 40 or 60 amp subpanel with like 6 ...
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1answer
145 views

Can I use an existing range circuit for a new sub-panel?

Lots of good information out there but wanted to confirm that what I'm learning is accurate and also ask a little about aluminum wiring. Context/Background I'm finishing my basement (one bedroom, an ...
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1answer
55 views

Turning on GFCI breaker on subpanel trips main breaker

I have a subpanel feeding off a 50 amp breaker. The subpanel contains a GFCI 50 amp breaker which is connected to a new 32amp spa heater. When I flip the GFCI breaker on for the heater, it immediately ...
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4answers
460 views

Help choosing an outbuilding sub-panel

I'm wiring a shed to use as an insulated tech workshop. A 20A circuit for 10 outlets, 15A for lights, and a 20A for a mini-split A/C. My main breaker appears to be 150A. Should I just match the 150A ...
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1answer
52 views

Want to add sub-panel in my barn - 115v, 60amp?

I'm looking to extend the dedicated electrical in my barn to a new sub-panel near where I will be placing hobbyist wood working power tools - miter saw, route, jointer, small lathe, table saw, etc and ...
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2answers
126 views

8 AWG solid EGC in raceway for 100 amp subpanel

I'm adding a 100 amp subpanel to my detached garage and have a question about the EGC I've already pulled through the underground LFNC-B raceway. Taking the advice from a similar post on this forum, I ...
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1answer
290 views

Is there a minimum height for a small sub-panel?

A few years ago I installed a very small sub-panel for hot tub and one outlet. The panel is mounted on a stem wall outdoors about 1.5' off the ground. It only has 2 breakers in it: a 240volt for the ...
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2answers
79 views

100 Amp Shed Workshop from 200 Amp House Panel 120' Direct Bury Cable [closed]

I am interested in some advice/support on installing a 100 Amp Main Breaker Sub Panel approximately 120' from my 200Amp Main Panel in my basement. I have a background and experience in electrical ...

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