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).
807
questions
0
votes
3
answers
115
views
Can I use a main breaker as an “occasional” disconnect switch?
I had a 100A service (MSP) with a 100A sub panel. I do not know the feeder size to the subpanel but it supports 100A but definitely not 200A.
Last year, the service (and MSP) got upgraded to 200A. The ...
- 676
1
vote
2
answers
103
views
Feeding Electric to outbuilding
I recently built a 30x50 shop with a small living area built out inside of it. Now I need to feed power to it.
I have a main 200amp feed through panel just below the meter. It's a Siemens ...
- 11
0
votes
1
answer
53
views
What size breaker do I need for my garage?
I want two two post lifts, one 80 gallon compressor, 15,000 watt heater and outlets for normal use and lights.
What size breaker box do I need and what gauge wire do I need if is 80 to 100 feet away ...
- 1
1
vote
1
answer
66
views
Is my new electric/subpanel plan correct?
I currently have 100A service and I want to upgrade to 200A. At the same time, most of the wiring in my house is old and I don't trust it. Finally, the current main panel is in a bad place in the ...
- 569
2
votes
1
answer
126
views
Can I use a 6AWG ground wire for a 100A feeder that has a section SER 1-1-1-3 and a section THHN?
I'm running a feeder to a 100A sub-panel. The total run is about 90 feet. 60 feet is in an attic, and I'm planning to use Aluminum SER 1-1-1-3, the other 30 feet is through a 1.5" PVC conduit on ...
- 539
1
vote
1
answer
71
views
How to wire Subpanel to main disconnect?
I need a 30a 120 circuit for new tools in my garage, or to reconfigure the tool motor for 220 and install that circuit. The feed from the meter comes directly into a 100a disconnect then via conduit ...
- 11
0
votes
0
answers
30
views
Remove jacket from SER cable for the last 5 feet? [duplicate]
I am running 2-2-2-4 AL SER cable from my main panel to a subpanel in my garage. Referring to the picture, I have my SER cable run in the basement from my main panel up to the other side of the wall ...
- 151
0
votes
1
answer
69
views
Which wire size and conduit for a 200A subpanel?
I recently got a service upgrade to 200A.
My old sub panel (from which all branch circuits connect) was 100A and recently got upgraded as well but the feeders are unchanged. To support this, the main ...
- 676
0
votes
2
answers
71
views
225A HOML2225 Subfeed Lug Block in 200A main breaker panel at service entrance feeds 200A breaker subpanel w/ 40' 4/0 AL SER cable in buried conduit
From this site, and others, I understand that NEC allows powering a Square D Homeline 200A sub-panel from a HOML2225 225A Subfeed Lug Block installed in a 200A Homeline main service panel, using 4/0 ...
- 141
1
vote
0
answers
51
views
Does a subpanel at boat lift need grounding rods?
I have a boat lift that is wired with 8/3+insulated ground (240v). I want to add a subpanel at the lift to install a 120 outlet and future overhead lights. Initially, I will have a GFCI 240 breaker ...
- 11
0
votes
1
answer
51
views
Panel Ground Wire Routing
The space between the right side of the panel box and the grounding bar is only 1/2" making getting the wires in and out a bit tight. But running it in between the neutral And ground bars there ...
- 195
0
votes
1
answer
39
views
Updating detached garage electrical
Looking to update the electrical setup currently in my detached garage - read through many posts on here of similar projects, but nothing with exactly the same specs. Hoping to find some right answers ...
- 3
1
vote
0
answers
62
views
Is my subpanel service entrance cable secured properly?
This will be a 100a sub panel. Using Al 1-1-1-3 SER.
Questions:
1.) Is this SER feeder wired and secured sufficiently?
2.) How about here where it enters the main panel? Can I put some form of ...
- 195
0
votes
3
answers
119
views
Can I safely add a 50A EV charge circuit breaker to a 90A panel?
I have a sub panel mounted next to my main panel that is supplied with a 90amp breaker. I would like to add a 50 amp breaker to handle a 14-50 plug for an EV charger.
My question is can the sub panel ...
0
votes
3
answers
76
views
Correct wire and conduit to extend a 30 amp circuit 350 feet?
I'd like to check my plan before contacting an electrician. I plan to install a 30 amp RV connection in a wet environment approximately 350 feet away from a 200 amp distribution panel. Based on ...
- 11
0
votes
0
answers
19
views
correct wire and conduit to extend a 30 amp circuit 350 feet [duplicate]
I'd like to ask a question here before contacting an electrician. I plan to install a 30 amp RV connection in a wet environment approximately 350 feet away from a 200 amp distribution panel. Based on ...
- 11
0
votes
1
answer
61
views
For detached garage: buried cable or overhang? [closed]
I am a DIY guy, looking into bringing 240v into my detached garage. Will be running air compressor, welder. Will install a 100amp Subpanel.
Should the cable coming from the house (main panel) to the ...
- 103
0
votes
1
answer
65
views
Connecting 4/0 feed wires to a 200A Challenger Main Panel: Can I use these lugs?
I have two 200 Amp Challenger Main panels in my garage. I am running 255ft of AL wire (4/0 4/0 4/0 2/0) through an underground conduit to a new 200 Amp Square D Homeline subpanel in an outbuilding.
...
- 31
0
votes
2
answers
134
views
Existing service panel has grounds on neutral bus and neutrals tied to grounding lug!
Opened this panel which serves a well pump on my property and was surprised to find the grounds bolted to the neutral bus bar, and the neutrals wired together to the grounding lug. I am pretty sure ...
- 1
1
vote
1
answer
36
views
Hot tub circuit breaker in sub panel trips after 5 hours
I have a 2 year old hot tub and the sub panel keeps tripping after the hot tub runs for a few hours. The heater, ozonator and sub panel circuit breaker were replaced to try to fix the problem but it’s ...
- 11
0
votes
1
answer
75
views
How to add 240v sub-panel from meter main lug of 1950's
Current meter main lug (100A), which is at outdoor, goes to a sub-panel inside house. I want to add a sub-panel (240v), which is also at outside, from the main lug.
One option is to replace the meter ...
- 101
0
votes
1
answer
57
views
Will adding heat pump second stage overload my service? [duplicate]
The first electrician who installed the 200 amp panel didn't want to connect the 2 stage HVAC, so only connected 1 stage. However, now the heating hasn't been able to keep up in winter. The new ...
- 1
1
vote
1
answer
55
views
Replace two 15amp breakers for one 30amp subpanel
I’ve searched a bit and I don’t know if this has been asked or attempted but…
Basically I want to run a few commercial grade pieces of equipment that have 240v plugs. My current situation is this:
...
- 11
1
vote
1
answer
227
views
Can I have a larger breaker in a sub panel than the size of the breaker in the main panel feeding it?
I have a 200amp main panel and a 200amp sub panel, a foot apart in my house. Concern I have is from the main panel a 100amp breaker feeds the 200amp sub panel. Is this correct?
- 11
0
votes
1
answer
86
views
Running power to detached garage
The time has come for me to run power to my detached garage. A little bit of background - I am well versed in all aspects of home improvement, am fairly comfortable and have done my fair share of ...
- 237
0
votes
1
answer
46
views
Eliminating a cartridge fuse subpanel [closed]
The house was built in 1957 and the electrical has been updated over the years. Recently I expanded the 2nd floor and have a new main service in the garage.
Under the basement steps is a cartridge ...
1
vote
1
answer
358
views
Would a 50A breaker for a sub panel be enough for a tiny house?
Would a 50 amp breaker for a sub panel be enough to power up a tiny house with these features?
7 can lights
120v water heater
5 outlets
bathroom GFCI
exhaust fan
Mini-split heat exchanger
3
votes
2
answers
698
views
Installing a 125A subpanel in outbuilding 200ft away but Main panel has no breaker that will take 4/0 cable (max 2/0)
Wanted to make sure I had the right size wire for the 125A Subpanel since it will be almost 200 ft away, went to buy a 125A breaker for the feed wires and they all only take 2/0 maximum. I have a two ...
- 31
0
votes
1
answer
37
views
If i have 2 ground rods at main disconnect can i hit the rebar from the subpanel
I have a 4 pack meter base outside with 3 100 amp disconnects one not being used from there I put 2 ground rods .
I have a subpanel in the building since I have 2 ground rods how I understand it is I ...
- 1
1
vote
1
answer
135
views
90amps from main to subpanel - PVC Conduit through stud to main panel
Looking to confirm that I can run my 2-2-2-4 aluminum feeder cable (good for 90amps) from outside via LB elbow into the location shown below, and into more PVC conduit through the studs, and into the ...
3
votes
1
answer
104
views
Should I oversize conduit and grounding wire size?
I'm getting ready to place my materials order and have a few last details/checks I could use help with. This is for installing a subpanel in a detached pump house. I'm putting a 60 amp two-pole ...
- 101
0
votes
1
answer
44
views
Do I need to use 60 degree C ampacity rating for feeders to 60 amp subpanel?
I calculated my wire size for feeders to a 60 amp subpanel, for a pump house, based on 75C column of ampacity chart. Terminals out of main and into subpanel are both rated 75C. But then I saw ...
- 101
1
vote
3
answers
839
views
What is a the maximum breaker size inside a subpanel?
I have an electric car that I'd like to charge faster. I have a charger (EVSE) that will pull 24A. I have a detached garage with 30A service running to it (10-3 wiring, 30A breaker at the main panel). ...
- 21
0
votes
0
answers
30
views
How to split a 30 amp 120v circuit to allow a sub panel containing two 20 amp 120vbreakers
I have an existing 30A 120v circuit breaker in my main panel which has been used to power a computer server rack and backup battery. A 30 foot long 10 gage 3 wire (black, white and green) extension ...
- 1
3
votes
2
answers
273
views
Converting fuse panels to a subpanel in a detached garage
The home i live in is an older one and when they remodeled it. They converted the in house fuse boxes to a circuit breaker panel.
The only issue is they didnt update the detached garage.
So looking ...
- 31
0
votes
1
answer
70
views
How to feed two subpanels from a 100 amp main
I have 100 amp main panel that is feeding a subpanel (125 amps). The amperage usage in the subpanel is more like 40 amps or so.
I am adding an addition where I plan to add another 100 amp subpanel (...
- 11
0
votes
2
answers
95
views
200amp (Main) Meter Panel to 200amp (sub) Panel (Siemens)
Long story short: Bought an old house and LADWP asked me to put in a new meter panel at the back of the house and convert the existing old (front) and very small panel to a sub. Both panels will be ...
1
vote
2
answers
161
views
Can I split 30 amp breaker with 10 g wire into a sub panel with 2 15 amp breakers and 12 g wire?
I want to run new electric to a new garage. I was hoping to have 2 lines, one for lights and 1 for outlets. What would be the best way to run this from my main panel in the house about 80ft away?
- 11
0
votes
3
answers
166
views
Connect generator to main panel
I want to connect a generator with a 50 amp power inlet box but as you can see from the picture, there's no space to install the circuit. Am i missing something? This main panel connects to a subpanel ...
- 1
3
votes
2
answers
237
views
Main breaker to sub panel trips
I ran 2AWG aluminum 140’ to my backyard barn through PVC conduit. I bought a cheap subpanel with seemingly positive reviews.
When I switch my 60A breaker on at my main, it immediately trips. I ...
- 43
1
vote
3
answers
167
views
Help in understanding capacity of split bus breaker panel with sub panel
My home was built in 1978 (USA, Washington State), and has a split bus panel for the main breaker box. It also has a separate subpanel, which I'm not sure if it is original or added later.
I am a ...
0
votes
3
answers
114
views
Adding a 50 amp sub panel 215 feet away from main panel
I have a Square D 100 amp main panel with plenty of capacity left and I am wanting to add a 50 amp outdoor sub panel that is 215 feet from the main panel. The sub panel would have only two 120 volt 25 ...
21
votes
3
answers
3k
views
Why are all the neutral wires in a sub panel burnt or melted?
My barn had a small (6-space) main lug sub panel with four 20A 120V breakers and one 20A 240V breaker. The panel itself was protected by a 50A 240V breaker in the main service panel. It was wired up ...
- 850
0
votes
0
answers
53
views
Is a 60A subpanel adequate for my needs?
I have a 200 amp service for main panel in the house. I want to add a subpanel in the barn 125 feet away, buried. I currently have a 10/2 cable going to a 20 amp panel and I keep blowing the breaker ...
- 1
1
vote
0
answers
44
views
Is old subpanel wiring configuration to code?
I opened an old subpanel and this is how it is wired. The fuses are all 30 amp, tube-style fuses.
What is the purpose of connecting the two left-most lugs?
Is that intended to increase amps?
Is this ...
- 101
1
vote
0
answers
68
views
Installing a subpanel with a service entry cable feed-through a Powerwall subpanel
Based on this post on installing an EV charger, I decided to research installing a sub-panel next to an existing surface mounted indoor sub (Square D HOM2040L125PRB), which is used for Powerwall ...
- 111
2
votes
3
answers
193
views
Daisy Chain Subpanels or Not?
I’m trying to run power to a well pump house/seed starting shed now, while also planning for a barn/shop several years in the future. I am wondering if I should have two separate circuits (a lot more ...
- 101
0
votes
1
answer
50
views
Stained Glass Sidelight Window
I have one sidelight window which has frosted glass inside and clear outside. I have researched and determined it is impossible to find a new window with stained glass. Can the outside glass be ...
-1
votes
1
answer
577
views
What wire size do i use for a 100 amp sub panel
I am adding a 100 amp sub panel off the 100 amp main breaker. Don't understand the directions on what wire size to use. I bought the PowerMark Gold 100 Amp 32-Space 32-Circuit Indoor Main Breaker ...
- 11
0
votes
1
answer
81
views
How to install a sub panel? [closed]
How to install subpanel?
Wired 888 stranded no ground to a 125a 8 space 16 circuit sub panel ( not purchased yet) in a metal greenhouse (hoophouse). 40amp breaker from main. Total run 120'. The wiring ...
