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).

Filter by
Sorted by
Tagged with
1
vote
0answers
58 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 ...
2
votes
3answers
118 views

Turning 100A Main to subpanel of 200A new main

I have a 100A old-style circuit breaker main (~1970, 2 conductor & ground) in the basement. I want to upgrade the circuits in the garage to allow for solar panels and PEV cars, so my thought ...
0
votes
2answers
100 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 ...
0
votes
0answers
26 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.
1
vote
1answer
48 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 ...
1
vote
2answers
97 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 ...
2
votes
2answers
35k 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
votes
0answers
54 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 ...
1
vote
1answer
59k views

What size wire for 100 amp sub-panel from a 200amp main panel? [duplicate]

I want to add a 100 amp sub-panel from a 200 amp main in an attached garage. It will be about 100 feet from sub to main. What gauge wire should I use? The sub panel is to hook up a 7.5 horse air ...
3
votes
3answers
22k 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 ...
1
vote
2answers
58 views

Splitting Service Equipment Across Two Enclosures

My house has a 200 amp service with a (circa mid 1980s) GE TM2020R Mod1 panel where all 20 spaces are occupied with THQP breakers. In order to provide room for expansion and to allow for GFCI and AFCI ...
1
vote
1answer
81 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 ...
1
vote
1answer
2k views

How can I safely connect a subpanel in a detached garage to the main with a 3-wire connection?

This weekend I attempted to install a breaker box into a pre-wired garage. The previous owners took the breaker box with them when they moved, and since I have installed quite a few subpanels, it ...
15
votes
4answers
2k views

GFI outlets tripped after power outage

I live in a rural area that has frequent power outages (Several per month. Less than a minute in duration). When the power is restored, several GFI outlets always trip. I am trying to track down ...
0
votes
0answers
34 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 ...
1
vote
1answer
88 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....
1
vote
1answer
55 views

Where do I connect the ground wire of a transfer switch being connected to a sub-panel?

I would like to add a gen-tran manual transfer switch to my electric panel but I live in a condo where the main panel is in an external meter room and my only interior panel I assume is a subpanel. ...
8
votes
3answers
742 views

Federal Pacific 200a main panel problem with oversized 100a 2pole breaker

There is a 200a FPE breaker box (yes, I am aware of all the problems). It is not in the homeowners budget to replace at this time. He has 2 issues: His panel is full His electric furnace is an older ...
2
votes
2answers
65 views

Do I have space in the main panel for a 60 amp double pole breaker?

Completing a workshop in the garage and I've installed a 60 amp sub panel in it for all the garage circuits. I plan on running 6/3 nmd from the main panel to this sub panel (a run of about 15 feet). ...
1
vote
2answers
139 views

Is a 60 amp breaker adequate for a 220v sub-panel to my garage?

150 panel in house. I want to run a 220 (sub-panel) feed to garage 25 feet away for 10,000 watt electric heater. There's room in the 150 panel. Would 60 amp breaker in the garage meet the 1.25 safety ...
0
votes
1answer
213 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 ...
1
vote
3answers
553 views

Installing a sub panel to a GE split bus panel

I want to install a sub panel to my GE split bus panel. The diagram indicates that I could replace the two full sized 2-pole breakers (2 inch wide each) on the upper left with three compact 2-pole ...
0
votes
2answers
55 views

Ground Bus Bar on Sub Panel

I was working on a house with a sub panel for a shed/workshop. The sub panel was fed off the house main panel via 2pole 50A breaker. The sub was a load center type with no main breaker. The neutral ...
3
votes
1answer
62 views

Can I draw 240v out of this configuration?

This is how my subpanel looks like. I am looking to install a breaker for an AC unit. 20A. The only caveat is that this has to be 240V. This is a subpanel coming from the main one. There is a breaker ...
1
vote
1answer
109 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 ...
1
vote
1answer
242 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 ...
0
votes
1answer
1k 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 ...
0
votes
2answers
68 views

Is there such a thing as an arc-fault breaker in 1/2” size for GE?

The panel is loaded but not to capacity. To bring the current sub-panel up to the imminent adoption of the 2017 code, half-sized AFCI or combination breakers would be great. Is there such a thing as ...
3
votes
2answers
1k 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 ...
2
votes
1answer
146 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
votes
1answer
55 views

Can I install a subpanel on top of boards instead of of between studs?

I am installing/replacing a sub-panel in the basement of a split-level. The new panel is on an unfinished wall (drywall on opposite side, towards living-room, but no drywall on the basement side), but ...
8
votes
6answers
28k views

Can I connect a 100A subpanel to a 100A main panel?

I currently have a 100amp main service box but it is all full and some are even doubled up.I'm wondering if i can hook up a 100amp subpanel off of it? If so what size wire to go with? It would be on ...
1
vote
0answers
42k 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 ...
0
votes
2answers
62 views

What size wire and breaker should I use for a small one bedroom cottage?

Have a small one bedroom cottage. I need to install a subpanel in it. I have a two hundred amp panel 30 feet away. The only things I will power in the cottage are two can lights, six outlets, small ...
1
vote
2answers
632 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 ...
2
votes
1answer
111 views

Subpanel Vs. 220v-240v NEMA 14-50

Thank you in advance for your advice! My project is to install a 220v-240v NEMA 14-50 outlet at my house’ s attached garage, which is nearly 65 ft/one way, from the house’ s main electrical panel / ...
5
votes
5answers
5k views

I do not have power to all my breakers

I exchanged my double pole 40 ampere breaker that supplied my sub panel for my garage with a single pole 40 ampere and now out of my six breakers in the sub panel only 1,3, and 5 have power. How do I ...
0
votes
0answers
51 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 ...
1
vote
1answer
112 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 ...
2
votes
6answers
39k 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 ...
0
votes
3answers
64 views

Grounding Requirements for same structure subpanel

I understand that unless a 250.32(B) (NEC 2014) applies, a separate ground wire should run from the main to a subpanel where the service is in a separate structure. Still confused however about NEC ...
1
vote
2answers
105 views

How can I fix my garage's existing wiring

My non-attached garage is currently fed with a 10-2 w/ground wire from my main service panel via a single pole breaker buried in conduit. When the wire enters the garage it enters a junction box were ...
2
votes
2answers
135 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 ...
3
votes
2answers
494 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 ...
0
votes
2answers
52 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?
3
votes
2answers
6k 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 ...
0
votes
1answer
48 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 ...
0
votes
1answer
101 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 ...
1
vote
2answers
83 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 ...
1
vote
1answer
65 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 ...