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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72 views

Need advise about fixing/replacing shed fuse box

I have an old house with a detached shed and a damaged fuse box I'm planning on replacing. There are 3 wires going to the shed and a metal water line between the shed. I'm planning on replacing the ...
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63 views

breakers on main panel trip after adding a sub panel

I've just added a subpannel 100amp with Gauge 6 wires to the main panel so that the new subpanel will feed a sauna 25amp + a hot tub 30amp. The sauna is already connected with gauge 8 wires 240V, it ...
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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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61 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
57 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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68 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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399 views

Is it ok to run a 100 amp sub panel off a 150 amp main panel?

I'm installing a GE 100 Amp MLO panel about 50 feet from the main panel in a different building that's about 700 sq/ft. I'm pulling three #3 in 1-1/4" PVC with a #6 ground. The main is a 150 ...
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1answer
164 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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39 views

Running power to a sub panel for a shed

So a friend of mine wants power to his shed for a tv, a small portable ac unit and some lights. I told him a 60 amp sub panel would be best just in case of expansion. So the issue is that from the ...
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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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38 views

Shed Electric help

I just built a shed. I have extra 10 Awg wire given to me. I would like to run 3 wires of 10 gauge to my shed (all i have left) and use a 30 amp breaker. Do i need to put a 30 amp service in to ...
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550 views

Sub panel 3 wire and 220Volts

My mom just bought an old house (1917). The Main Breaker has 3 wires two hot from a 30amp 220 breaker and one ground going from the main into a sub-panel, there is no room to feed a 4th neutral wire. ...
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35 views

Workshop subpanel with possible solar backfeed

Needing to run power from the residence to the workshop. the need is 220v for the welder in addition to overhead lighting, the run is 375'....what wire and conduit size is needed? If in the future, ...
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1answer
137 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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60 views

Run 12/3 through insulated wall to surface mounted electric panel

Should/can I run the 12/3 wire inside the wall or just run a conduit up to the attic? The project: I want to install split receptacle 20 amp outlets in my garage. The subpanel in the garage is ...
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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 ...
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114 views

Service needed to add a tankless water heater

I am currently building a detached 250 sq feet studio in my backyard. The studio will have a tiny bathroom with a tankless water heater, a baseboard heater, and a few lights, a mini split (ac), of ...
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117 views

Questions about installing an electrical subpanel (re: wire size, etc)

My current electrical panel is filled and I'm going to have a pool installed this year so I need to install a subpanel. (my current box doesn't support tandem breakers, etc) Because I only need more ...
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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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1k views

Breaker to outdoor Sub panel keep tripping

Need help with my outdoor kitchen fridge. A 20 amp fuse at the main box goes takes a 10/2 w/ground wire to a sub panel. The sub panel has two 15 amp breakers circuit one goes to a storage shed via ...
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877 views

Feeder type and size for 60 amp. subpanel

Is it possible/recommended to use E18679 (UL) ROMEX SIMPull AWG 6 CU 3 with AWG 10 ground Type NM-B 600 volts as feeder from a 60 amp breaker to install a subpanel? Subpanel will be located in ...
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106 views

Sub Panel Remote Control?

I would like to know if it is possible to have a relay control power to a sub panel? I am thinking of wiring a cottage with most of the lights in one sub panel. I would like to be able to power this ...
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200 views

Sub panel cable feed code

The inspector failed the sub panel box location because it only had 6 feet clearance and not 6.5. The electricians came and moved the sub panel box, but they did not run a new feed cable. They put a ...
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1answer
68k 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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2answers
89 views

URD 1/0 wire for 100amp subpanel 60' away from main box

Can I use URD aluminum 1/0, 1/0, 1/0, 4 wire to run a 100 amp subpanel approx. 60' away from my main box? I plan I running it through my attic which in Arizona can get very hot in summer time if ...
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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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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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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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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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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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34 views

i have a pool heater to install the elect lists 208/240-575 vac 60hz 3 phase i have 175 ft from main panel what size sub panel and size wire to feed?

I am going to install a separate sub panel for my pool. currently have a double 60 breaker supplying power to the pool pumps and am not sure if i can upgrade the current feed to accommodate the heater ...
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54 views

Subpanel dilemma: Supply has no neutral

I have a 30x40 shop building detached from my home. I am upgrading the shop's subpanel when I noticed that the line from the house's main breaker panel does not include a neutral. Just two hots and a ...
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72 views

How should I handle grounding & neutral bonding when replacing my sub-panel?

Current subpanel was installed in the early 70s. We think we need to replace it as lights are not working (very dim, flickering/fading in/out) - we suspect an open neutral. How do we wire in a new ...
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44 views

Momentary 'brown-out' when a motor kicks on

As a home owner, I have an ongoing issue which is that everytime any motor kicks on (refrigerator, AC condenser, sabre saw, etc.) the lights dim for a second or two. The main service is at the ...
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162 views

How can I reverse my breaker box cover panel ? Opens the wrong direction

I have a square D load center - HOMC12UC. You can install it with the door opening in either direction, since there are identical punchouts in the top and bottom. However, my installer wasn't ...
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54 views

Grounding new branch circuits in an existing subpanel

Barn A contains the main panel. Barn B has a subpanel fed from Barn A via (3) 2-0 aluminum conductors, 2 hot and 1 neutral, with a 60amp breaker in the main panel. There is no grounding conductor ...
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38 views

is it expensive or necessary to relocate the sub panel from my bathroom to another room in my small condo?

My inspector stated it was an area of concern that my sub panel is located in my bathroom and should have it relocated to another room due to possible moisture getting in; Is this something I should ...
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117 views

Voltage detector goes off for no reason

Circuit at breaker box is 30amps. Ground is free standing not connected to neutral or ground bar. The outlet is removed presently with no wires touching each other or anything else near the outlet box....
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437 views

Breaker to Sub-Panel keeps tripping

I have a 30 amp double-throw breaker in my main panel that feeds a sub-panel in my shop. A few weeks ago, one of the 2 circuits in the shop stopped working. Then, a few days ago, the breaker in the ...
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45 views

Can I put two 30A double pole breaker s and a few other 15A breaker s

Can I put two 30A breakers and a few 15A breaker s all in my 60A subpanel ? The pic shows the existing breakers and I want to put one more 30A and one 15 A for a laundry set. Thanks for your ...
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121 views

100 Amp Sub Panel in basement garage from 200 Amp Main in the upstairs garage

I have a two story garage. The bottom garage is below grade on 3 sides. The upstairs garage has its own 200 AMP main service. I will be running wire from the main via 100 amp breaker to the sub panel ...
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36 views

What wire size is needed?

I need to run 110 volts AC 300' to a subpanel. What size copper wire do I need? Wire will be run in conduit underground.
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42 views

square d q/o sub panel

I had one breaker running kitchen and garage. I used skill saw and it blew breaker. I bought 2 new 20 amp breakers and separated lines. the garage on right side and kitchen on left. everything on ...
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1answer
767 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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83 views

Putting a sub panel for a home office/bedroom?

Recently, our neighborhood had a power outage for a few days. Causing my office/bedroom to lose power completely which was a bit of an inconvenience. Out of curiosity, I began googling about ...
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24 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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373 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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31 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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359 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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34 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.