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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2answers
846 views

Direct Burial MC Cable

I want to install a 100 amp 230 volt single phase service from my house breaker panel to an external shop building. My house service is 200 amp 230 volt. Is it permitted to use direct burial MC ...
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1answer
98 views

Feeder Wire Ampacity

I am planning to run two sets of four-wire cables (two hots, one neutral, and one ground) through the same conduit to feed two subpanels from a single main breaker panel. I understand that I need to ...
5
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1answer
2k views

Can I feed 2 sub-panels off one breaker?

I have a 225A main service panel. I also have 2 sub-panels with 125A and 200A ratings respectively. There's a 100A 2-pole breaker in my main panel. I want to feed both sub-panels from that single ...
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1answer
2k views

Can I use a 70 amp panel for a 30 amp service feed?

I am running a subpanel off of a 30 amp breaker, I need to run a smaller subpanel off of that. Can I use a 70 amp rated panel for my 30 amp service feed, so that I will have room in the panel to put ...
5
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1answer
125 views

Is a grounded/neutral wire (not grounding wire) required to be run to a subpanel that will supply only 240V (2-pole) devices?

I'm installing a subpanel that will supply only 240V 2-pole devices. I'm positive I never will need the capability to run 120V (1-pole) devices. Am I required to run a neutral wire to the subpanel? ...
3
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2answers
3k views

Proper way to wire a sub panel to an attached garage?

I am planning to install a new sub panel in my garage. My concern is following proper procedure/code. I contacted the local building code office and confirmed that they follow the 2014 NEC. My main ...
2
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1answer
2k views

How can I build a subpanel off a 3 prong 220V dryer outlet?

I have an unused 220V, 3 prong (2-conductor) dryer outlet in my garage and would like to convert that into 2 110V supplies to some overhead lights and a ceiling outlet for a garage door opener. How do ...
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2answers
2k views

Breaker box below electric meter

I have an interesting question for anyone willing to answer. Below my electric meter outside there is a breaker box housing the 200 amp main shut off breaker as well as two 20A outside appliance ...
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1answer
176 views

Oven 3 Wire in Subpanel

I keep looking for a situation like mine on this website and other websites, but I was unable to find one. A 3 wire oven (two insulated hots and 1 bare twisted wire) is connected in an old main ...
4
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1answer
3k views

Arc-fault breaker in sub panel, pigtail to neutral bus or ground bus?

I recently replaced an arc-fault breaker in our subpanel that I thought to be faulty (it kept tripping at strange intervals around when I added a new dimmer, but I found no issues with my dimmer ...
2
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1answer
147 views

feeding 30 amps to detatched shed with 10/3 armored cable?

Can I use the existing 10/3 steel armored cable as feeder for a 240v 30 amp subpanel in my garage (detatched)? That's 3 wires and a grounded metal jacket. 2 hots (red and black) which connect to a ...
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2answers
5k views

Is a conduit required or recommended when running SER wire in unfinished space?

I'm planning on installing a 100amp sub panel in the garage. The garage is right around the corner from the main load center in the basement, but part for that path goes through the stairway from the ...
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1answer
237 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 ...
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1answer
117 views

Energy Monitor Install load center phase connection

In an attempt to ensure accurate electrical load center phase connection for a neurio home energy monitor, the installation video around 2:40 mentions connecting to the red wire to another Phase "let'...
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2answers
67 views

Home energy monitor install

Is a Neurio energy monitor compatible with a manufactured housing load center? The load center, image below, doesn't seem to be officially supported however the approach seems sufficient. This kind ...
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2answers
239 views

3 wire service to older building doesnt look correct

Basically there's 3 wires running from a 125 amp breaker on the main service. A red(125v) A black(125v) and a white wire(neutral on ground/neutral bar) in main, all running to an older building with a ...
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1answer
409 views

Subpanel or not? Neutral and ground bonded?

How do I fix the AC unit to be connected properly to its circuit? How should the AC Unit/Garage/Subpanel be setup? Maybe I can separate the neutral and ground, then ground by connecting to the garage ...
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2answers
554 views

Loads for sub panels from 150A split-bus main panel

This box has a capacity of 150A. The breakers in the upper section are as follows: Left side upper: RANGE 60A, AIR CONDITIONER 40A, MAIN 60A Right side upper: MICROWAVE 20A, FRIDGE 15A, KITCHEN ...
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2answers
695 views

Can I install a 50A breaker in a 70A sub-panel with other breakers installed?

I have an electrical panel in my garage with a single row of breakers 4 single 15A breakers installed and 4 blank spaces left. (pretty certain it is a sub-panel off the house) It has a sticker that ...
6
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2answers
1k views

What size cable do I need for a replacement sub-panel?

I'm doing a kitchen remodel and while tearing down the walls I found quite a mess of wires from a sub-panel that exists in a small closet off the kitchen. It was so bad that I decided it needs to be ...
2
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1answer
683 views

Replacing subpanel in detached building - yet another ground/neutral question

Here's the situation. I've added on to my detached shop/garage and need to upgrade the very small subpanel. The existing garage pre-dates the 2008 NEC by at least a decade, and is supplied by a 3 ...
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3answers
988 views

My subpanel has neutral and ground all mixed together?

I read that this might be bad, but it appears both neutral and grounds are mixed on two different bus bars. It isn't just one wire that doesn't follow the pattern; there are several neutral wires on ...
3
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1answer
285 views

electrical work: create “future boxes” - is this to NEC code?

I would like to run cable for an in-wall heater but not actually connect to the heater right now, I just want to get the cable run and connected to the sub-panel (along with all the other cables that ...
2
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1answer
1k views

How should I wire a subpanel for a tiny house?

I have a subpanel almost wired in our shed, it's being converted into a tiny home for a few months, it's about 25ft from the main panel which is inside of a mobile home. The main panel I believe is ...
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1answer
2k views

Can a surface mount Spa Panel be recess mounted in drywall and 2x4 wall?

My city uses 2011 NEC. I would like to install a 125 Amp rated Spa Panel as a subpanel directly below my 200 Amp main circuit breaker panel to be able to use two 50 Amp GFI circuits. I already have ...
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1answer
120 views

Adding a sub panel

I have a 200-amp main panel. I want to feed another panel, which will have two 50-amp breakers (for air conditioning and stove) and one 30-amp breaker for the clothes dryer. The sub panel will be ...
3
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2answers
1k views

Sub-panel with single ground and common bar - with a twist

I know that this question has been asked and answered before however I have a possibly unique twist. The old question: Does a sub-panel require that the ground and common wires be on separate bars? ...
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2answers
100 views

Adding a subpanel, but have one question.

I decided to add a small subpanel to accommodate extra outlets for my garage. I have an older Square D 100A main panel. Only cat no I could find is QOC-20m e6. First thing I noticed after pulling the ...
2
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1answer
541 views

How to add a surge protector on 240 circuit at pool sub panel - neutral or ground connection?

Trying to add a surge protector at a sub panel by pool. The 240 circuit runs from the main load panel on side of house to sub panel by pool - red, black and green only - to a disconnect and the pump. ...
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1answer
84 views

main breaker panel to sub panel

The main breaker panel has the grounds and neutral hooked together and has bonding screw installed. Where do I put the ground wire for the sub panel? Do I put it on the neutral bare where the white ...
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3answers
2k views

2 wire sub-panel corrective action

Can I correct 2 wire supply by adding a bare copper wire buried to sub-panels? I have two out-buildings with sub-panels fed by 6/2 wire w/ground. The main is 100 amp The sub-panels each has a 50 amp ...
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1answer
309 views

Ground rod for detached sub panel

My contractor sunk a length of rebar in the footing of my shop to be used as ground rod for the sub panel. I'm not sure but I suspect its just a 10 ft. length of rebar, and isn't tied into the rest ...
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3answers
120 views

Wiring second breaker panel

I have a 100 amp service running from meter base to new garage, that's completely wired. Now, I'm going to run from garage to new house under construction. I want to use another one hundred amp ...
3
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1answer
6k views

Wiring 100-amp sub-panel for 1hp pool pump and heater

The project is to wire a 125-amp sub-panel from the main, approx. 50 feet away to serve a 220v in-ground 1hp pool pump, heat pump, and 120v LED pool light. Wondering if the following plan will ...
7
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4answers
2k views

How to add a gfci and surge protector to pool pump line?

I want to add a gfci and surge protector to the 240v circuit for my pool pump. The 12 guage power wires (red and black) and ground (green) run from the corner of yard directly to the main breaker ...
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3answers
788 views

Should my subpanel have a neutral conductor feeding it?

I have a subpanel to an outdoor patio 75 yards from the house main breaker box and don't think it is wired properly. There are two large hot lines from the main controlled by a 50 amp breaker that go ...
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2answers
229 views

Is it legit to use this disconnect this way

This is more an expert question for the senior users here, i.e., licensed or former electrician, and/or engineer. I want to replace a rusted out sub panel that feeds 3 circuits at a residential dock ...
1
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1answer
7k views

Circuit breaker panel voltage drops when a load is added

I have a 240 volt 225 amp sub-panel. Both lines attached to the bus bar have 120v. When I turn on any breaker connected to one of the bus bars, the voltage drops to 80-108v. If I remove the load and ...
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2answers
119 views

Can I take a 240 volt 33 amp male plug an slice [closed]

Okay. So I wanna wire my garage. My old home has an old unused 3 prong 240v plug just chilling. My home is limited to 100amps. Old old home. So, the garage, 60ft away has no power. No power=no man ...
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1answer
574 views

Wire gauge for subpanel

We are putting a 100 amp sub panel in a building with an eye toward making it a small apartment. We will need to run 160 feet of wire from the 200 amp main. We have been told to use 12/2 gauge and 14/...
1
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1answer
360 views

How can I replace an I-T-E panelboard? [closed]

I have an old 225 Amp 30 space commercial flush mount sub-panel in my home with bolt on breakers that has worked for years. Now, there's 120v on one bus and 0 volts on the other bus. When I remove ...
4
votes
3answers
8k 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 ...
2
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2answers
1k views

Power loss on a sub-panel

I have an old ITE main panel in the garage with 600 amp service which has 3 - 200 amp breakers, each feeding a sub-panel in the house. All 3 ITE sub-panels in the house have been fine for over 5 years ...
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2answers
184 views

Do I need to run a ground from my main panel to the new sub panel 100' away?

Do I need to run a ground from my main panel to the new sub panel 100' away or can I establish the ground at the shop location ie. UFER?
2
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2answers
20k 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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1answer
1k views

Should neutral be bonded to ground in main and subpanels?

I had a licensed electrician replace my main panel and also install a subpanel in my garage. At the time I knew nothing about electrical, and now I know just barely more than nothing. I have ...
0
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1answer
2k views

Biggest size breaker in 200 amp panel

I am upgrading my service to 200 AMP. Since the location of the old service is behind a cabinet, we moved the main panel to a different area. This put it more than 15 feet away so we have a 200 amp ...
0
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1answer
579 views

New Main Panel & Sub-Panel - Hooking up Ground / Netural - Connecting to Plumbing / Ground Bar

Older 1960's house. The outside panel is a FPE Stab-Lok that needs upgraded. Will be using this panel to upgrade it, which has a 125-amp main breaker: The current box is directly to the left of the ...
0
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1answer
207 views

Can I use a GFI main breaker in series with individual QO AFCI breakers?

I'd like to install a subpanel using a 2-pole Square D QO GFCI breaker in the main panel and then installing individual QO CAFCI breakers in the subpanel where needed for the dual protection. It ...
3
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2answers
304 views

How do i know how many amps to send to my subpanel?

I am building a 24'x15' woodworking shop inside a larger pole barn. I want to put a subpanel in the shop fed by the buildings main panel but how do i estimate the size of the breaker to use in the ...