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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
521 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 ...
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2answers
293 views

Second 100 amp breaker inside existing 200 amp residential panel for new detached garage

I'm planning to build a new detached garage. My question is can I add a second 100 amp breaker to my existing 200 amp Square D residential panel box? The existing 100 amp breaker goes to my quest ...
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2answers
49 views

run nmb cable in conduit

I've decided to run a new 60 amp sub panel in my garage using 6/3 NMB. Can I run it 35' through 1" pvc conduit from main panel to sub panel without stripping off the outer sheathing?
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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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2answers
66 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 ...
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1answer
46 views

what size of sub panel do I need for a small in law unit

Im converting my garage into a small inlaw unit for my daughter I have a 125 amp service to my house. she will have a burner plate, fridge and an mini split ac unit for air and heat. it has a gas ...
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1answer
60 views

What size wire needed for 100a subpanel 120ft away from house sub panel? Biggest amp draw will be a window A/C unit, and a pool pump

What size SER wire needed for 100a subpanel 120ft away from house sub panel? Biggest amp draw will be a window A/C unit, and a pool pump. Other than that, just a few LED lights and outlets...detached ...
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2answers
59 views

Wiring a sub-panel with an equal sized breaker on each end of the feed, which will trip first?

I'm wiring up a small backyard tiny house for use as a rental.  Main power will be supplied by a 30A breaker and 10/2 wire coming from the main house, to an RV box, then to an RV plug, then into the ...
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2answers
59 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 ...
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1answer
57 views

RV sub panel on main feed

I want to add an RV subpanel to our cabin, but the location where I want it is very close to the main service switch, but pretty far from the circuit panel inside the cabin. Currently, there is about ...
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2answers
46 views

Protruding subpanel

I am in the process of installing a subpanel to replace a fuse box in an apartment. My problem is that all the walls are very shallow such that subpanel protrudes about 1 1/2”. It seems all the studs ...
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2answers
80 views

Wiring from Main to Subpanel

I posted a question a few weeks ago regarding wiring to a pool sub-panel, and I'm grateful for the wonderful information I received. Since then, I learned a little more about the area between my main ...
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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
44 views

Sub panel for garage

Can I put a sub panel in a garage 100 feet away from house. I only have 100 amp service in home. What size wire and breaker should I need?
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2answers
41 views

Need help understanding amperage ratings for panels and sub panels

Im trying to understand the concept of amperage ratings for panels, and sub panels, but I'm not sure I have it figured out, sorry for any novice terminology. I'm in America. Grounds omitted for ...
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2answers
45 views

Wire and Conduit for Indoor Sub Panel with Outdoor Main Panel Through Attic

My main panel is outdoors on one end of my house. Planning to add a sub panel for very occasional welder use, electric car charging, and future expansion in the garage on the other side of the house. ...
2
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2answers
81 views

Mount subpanel on below grade stem wall

I am redoing my basement and I am putting in a new subpanel to handle a few extra circuits since my current panel is undersized (I wanted to replace it, but according to the electrician who I’ve been ...
2
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1answer
34 views

Advice on installing an attached garage 50A sub panel

I'd like to add a 50A sub panel to my attached garage workshop. The sub panel feeder line will run from my 200A main panel, through my basement ceiling space and enter through the garage wall. The ...
2
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2answers
93 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 ...
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1answer
87 views

Grounding a 3-wire sub-panel in attic

Early 1960's home. 200-amp main service panel on first floor. 3-wire (L-L-N) feeder to 100-amp sub-panel in the second floor attic, about 25-30 feet from the main service panel. Neutral and ground ...
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2answers
73 views

Ground wires: Do I have this right?

I have 200A load center with a solid bare #6 ground wire tied to a ground rod. Ground/Neutral are bonded in the box. Then run stranded #6 (does it have to bare?) to the 100A auto transfer switch. ...
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3answers
89 views

Wiring Pool Subpanel for Pump and Receptacles

The project is to wire a sub-panel and three pool circuits. My 400A main panels (2) are about 35' away, and I don't have room inside the basement to mount the sub panel inside. I plan to use an ...
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1answer
66 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....
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2answers
14k views

Is it ok to use a ground rod at a subpanel instead of a fourth wire?

I understand running the neutral wire back to the main service panel and not bonding the subpanel... but running the equipment ground back to the main panel seems to get conflicting answers. If ...
2
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2answers
68 views

Dryer receptacle on sub-panel feeder

A (built in 1987) house that we are under contract to buy has a 30-amp sub-panel in the attached garage. The sub-panel is currently populated by two 120V, 20amp circuits for receptacles in the garage. ...
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3answers
221 views

How can I connect 2AWG cable to my 100A panel?

I have bought a gazebo (closed) that will serve as a studio and I want to place it on the edge of a wood that is approximately 400 feet from my house. I was planning to run underground wiring from my ...
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0answers
21 views

Need help to Determine the Size a Subpanel

The subpanel will have ac/spa/220v plug. 30+50+40=120 amp Want would be the main breaker for amperage? 100 or 125 amperage? I know the panel will be a 125 amp but I don't want a too big panel on the ...
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5answers
36k 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 ...
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1answer
58 views

Please clarify wiring to and for remote pool load center

I am replacing an old remote mechanical timer power box for a swimming pool with a new "Pentair Easytouch 4 Load Center with circuit breaker sub-panel". Background: 200A Main Panel (Sylvania - ...
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0answers
78 views

What size wire for a 60A sub-panel at 185 feet?

I have a 200 amp panel in my house. I want to run electric 185 feet buried and put in 60 amp sub panel in garage. I'm hoping this will give me 4 15 amp breakers in garage. What size wire do I need?
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1answer
68 views

Three wire vs four wire feed remote sub panel

I added a drawing. of both wiring configurations. The only advantage I can see is the 4 wire gives you a dedicated ground fault circuit vs sharing the neutral wire. Open neutral between the two ...
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3answers
52 views

Sub Panel using Sub Feed Lugs

We're getting ready to build a detached garage/ADU about 100' from our main house, and have a quick question about getting power out to the building. We currently have a 320amp service to the main ...
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2answers
71 views

Sub-panel wiring, grounding, disconnect

I have about a 180' run from my house's main panel to my shed. I've installed a SquareD Homeline 70A sub-panel which has no main breaker, and has two breakers within. I have installed a ground bar in ...
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0answers
25 views

Pool heater hook up

The main panel in my house is 200 amp. I installed a 100 amp subpanel in my garage. Can I put a double-pole 50 amp breaker in my 100 amp subpanel for a pool heater?
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2answers
85 views

60amp panel install in an attached garage, do I have my ducks in a row?

I have been considering putting a sub-panel out in my attached garage, wanted to know if I have all my ducks in a row before starting the process and pulling a permit. Items to be powered - Table ...
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2answers
67 views

double wired circuits and grounds and neutrals sharing the same bus bar. Is it OK?

double wired circuits and grounds and neutrals sharing the same bus bar, is it OK to wire like this? Sorry I am not a professional in this field. 2 red and 2 black coming from main panel.
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1answer
96 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 ...
2
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2answers
27k views

100 AMP garage sub-panel from 200 AMP house

I've checked a number of the other questions but not finding the specific answer I need. I'm wiring a 100 AMP garage sub-panel from a 200 AMP main in my house. I plan to install a 100 AMP circuit ...
2
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1answer
86 views

I have a buried wire for a generator in my shed. Is there a safe way to reverse the feed to power the shed?

My current setup: Main panel has 60A 240 breaker that feeds Generator subpanel which has 10 circuits on it. The Gen Feed to the subpanel comes from buried 10-3 in my shed. That works well for running ...
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1answer
222 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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0answers
31 views

50 amp breaker for Range on a 60 amp sub panel

I have s 60 amp sub panel that powers only 3 20 amp circuits. Can I add a 50 amp breaker for my range?
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0answers
27 views

Installing a 50 amp sub panel

Can I install a 50amp sub panel to a detached garage if I only have 3 wires running? Just bought the house and wire is already there.
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1answer
56 views

Adding sub panel - detached building

This is the first one I've done and want to make sure it's correct.. 200amp in the house 110amp breaker to subpanel 2/0 aluminum wire 140' URD 4 bare copper ground less than 6' 8' aluminum ground rod ...
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0answers
50 views

Manual Transfer Switch to power Main panel and Sub panel circuits

I had installed a Reliance model 31410CRK manual transfer switch, which has 10 individual circuits. I happen to have a Main panel, and a Sub panel which are a few feet apart. The Sub panel was ...
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1answer
849 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 ...
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1answer
43 views

Sub Panel for Floating Boathouse/Dock

I am upgrading the electrical service to a floating boat dock in a home I purchased last year. The lake is managed by the Army Corps of Engineers and has specific regulations I'm required to follow. ...
2
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1answer
128 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.). ...
2
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1answer
278 views

Running 240v power to detached garage for electric vehicle

We have a detached garage approx 95ft away from the main house and we are looking to run a 240v circuit there. Currently we have Romex wire running straight into the ground. (This is how it was when ...
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2answers
558 views

Installing sub-panel, plus hot tub to new sub

Need to install a sub-panel off a 200amp service main panel that will be situated next to each other via 1" pvc conduit from bottom of each. The sub-panel is being installed to accommodate/supply a ...
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1answer
70 views

Sub panel wire run [duplicate]

I am trying to install a 60 amp sub panel in my house to power my wife's saltwater tanks. I know I need 6/3 to go from main panel to sub panel. My question is I have to run it along the wall to get to ...