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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1answer
70 views

How do I break the ground/neutral bond in this sub panel?

The previous owner put in a sub panel. 6awg plus ground is feeding it with a 50 amp breaker at the main. It is in an attached garage. I’m going to fix what he did with the bonding. What is the metal ...
1
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1answer
68 views

How should I ground a shop and a house who both have 2 breaker boxes? One fed by the grid and the other a solar inverter

As the title states, I have a house and a shop both with 240 feeders coming from the grid. I have solar panels and a solar inverter in the shop. The solar inverter is powered by panels, a 48v ...
3
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3answers
126 views

Can a circuit connecting to an outlet be branched as a subpanel?

Can I have something like this, or does the cable run from the panel to the subpanel need to be dedicated? Main Panel+Breaker -> 40A dryer box with Outlet -> Subpanel+Breakers -> More ...
0
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3answers
67 views

Sub panel neutral and ground

Our building (built in 1960) has 5 sub panels everything being run in rigid or emt conduit. The neutrals are isolated. If I need to add some 15A receptacles can I add a ground bar to panel cabinet ...
0
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2answers
68 views

How do I connect a sub-panel to a generator transfer switch?

Our house currently has a transfer switch to our main panel. Our barn has a subpanel that houses our electric fence and more importantly, well pump. As of right now, the transfer switch does not ...
5
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3answers
706 views

Can I add a second set of lugs to a 200A panel for a second sub-panel?

I have a 200amp service meter wired to a 200 amp outdoor breaker panel which has lugs feeding my 200amp breaker box in the house. I'm adding a garage 30 feet away. Can I put another set of lugs in the ...
1
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2answers
87 views

What size wire for a 200A panel in a shed?

I have put in a 200 amp panel in the shed and will run a mini-split A/C unit (25 amp draw), a computer, and a few LED lights. What size wire do I need to run from the house main panel to the shed. I ...
2
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3answers
105 views

Main and subpanels selection in new project

I am working, with full permits from the city and future planned inspections of course, as an owner builder for the following projects: construction of a detached garage, where I need a 200A service ...
1
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2answers
108 views

Can a panel ground enter through the same opening as the power cables?

I've installed a new subpanel and service cable, upgrading it from the 30 amp to 100 amp. I installed a new grounding rod and wire to the new panel. I noticed on the old panel and the main panel, the ...
0
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5answers
97 views

100 amp hot tub panel, only need 50 amp

I've got a 100 amp subpanel that the previous owners used for a hot tub. The new hot tub we're getting only needs 50 amps. Can I reuse the existing wiring, breakers and subpanel for the new tub, or do ...
0
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1answer
48 views

Can a 100 amp sub panel be mounted directly to a metal building frame?

My main 200 amp panel has the neutral bus bar and the equipment ground bus bonded. I am running 2/2/2/4 al wire to the 100 amp sub panel. The neutral bus and the equipment ground bus are not bonded on ...
1
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1answer
153 views

Using 6/3 NM cable to feed 60 Amp to subpanel

EDIT: Nobody was willing to answer cable needed for 100 amp feeder so removed questions. Also, code references in the answer are several years or more out of date... Ed B was correct to be careful of ...
2
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4answers
148 views

Can you wire out multiple subpanels from main panel?

I'm doing the panel schedule for a 400A residential service, but running out of space on the 40-circuit main panel. Here's a cartoon of what I would like to do. Is it possible and/or advisable to tap ...
0
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1answer
102 views

How to fix bonded neutral and ground in subpanels

I am selling my home and the buyers inspection says the bonded neutral and ground must be corrected. How should I fix this?
0
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2answers
78 views

Wiring a 100amp subpanel from a 200amp main panel

I currently have a 50 amp sub panel in my guest house. I need to upgrade to a 100 amp panel. The main panel is a 200 amp panel about 300 feet away from the sub panel. The electrician told me I need ...
2
votes
1answer
163 views

Should the grounds and neutrals be isolated in this "subpanel"?

I have a main disconnect panel outside by my meter. I've got the two hot legs, a neutral and a ground wire from a ground rod below the meter coming into the panel. The neutral and ground wires are ...
1
vote
1answer
65 views

Sub panel size needed?

New to the group, I have a shed which is about 65 feet away from the utility pole. I have a meter and 12 space box below where the previous owner ran 14/2 Romex underground from a 20A breaker. (Yes ...
3
votes
1answer
64 views

60A Subpanel with feeder wire spanning a finished section of the basement

I just recently had my GE 20 space main panel with 100Amp service replaced with a 40 space GE panel and 200Amp service. I am looking to install a 60 or 80Amp subpanel in the garage fed by this main ...
2
votes
1answer
362 views

Electrical plan review - detached garage subpanel

Going to run entirely new power to a detached 2-car garage. I have bolded concrete questions, but appreciate review/feedback on the entire plan. I will have this inspected by my city who uses NEC 2017 ...
1
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2answers
101 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 ...
1
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1answer
77 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 ...
5
votes
3answers
520 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, ...
1
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0answers
81 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 ...
2
votes
1answer
90 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 ...
3
votes
2answers
202 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 ...
1
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1answer
125 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 ...
0
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0answers
23 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 ...
0
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2answers
101 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 ...
0
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2answers
168 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 ...
1
vote
1answer
87 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 ...
0
votes
1answer
59 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 ...
1
vote
2answers
91 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 ...
0
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2answers
120 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 ...
1
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2answers
164 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 ...
0
votes
2answers
114 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 ...
0
votes
0answers
39 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 ...
3
votes
3answers
576 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 ...
1
vote
1answer
402 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 ...
1
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3answers
75 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 ...
1
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3answers
145 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 ...
9
votes
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 ...
2
votes
3answers
352 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 ...
3
votes
1answer
55 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
votes
1answer
61 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 ...
0
votes
0answers
26 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 ...
1
vote
0answers
73 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 ...
1
vote
1answer
98 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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votes
2answers
161 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 ...
0
votes
2answers
69 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 ...
0
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0answers
34 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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