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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2 answers
78 views

Is my wiring to subpanel adequate?

Here’s where I am at. I have a metal shop building about 160 feet from my main panel. I have a 400 amp service. I ran 2 inch pvc conduit about 36” deep. My wire is 3 wire 2awg use 2 aluminum with ...
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0 answers
24 views

Schedule 40 PVC into threaded conduit hub on top of panel?

I'm surface mounting this NEMA 3R rated Eaton BR Loadcenter outside. I will be feeding it using 1 1/4" Schedule 40 PVC conduit from above. Can I use a 1 1/4" PVC Male Terminal Adapter and ...
1 vote
2 answers
40 views

How to route #8 THHN wires into an existing panel

I have a main panel in my garage, with an existing sub-panel mounted right next to it. I want to add a new sub-panel at the opposite side of my house and need to run three #8 THHN and a #10 THHN into ...
0 votes
2 answers
66 views

Can I ground a sub-panel with a wire from the main panel in the same structure?

I have a three-wire cable feeding a 60A sub panel from the main panel. Will a separate wire from the main panel to the sub-panel suffice for the ground or neutral in the sub? Separation of ground and ...
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0 votes
1 answer
42 views

voltage on ground wire when sub panel is bonded and short to ground

I have a main 200 amp feeder panel which is bonded. It feeds a separate 200 amp distribution panel with about 30 circuit breakers which is also bonded. That situation existed since house was built 12 ...
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0 answers
56 views

Is a service conductor not part of the service?

In Article 100, titled Definitions, of the 2020 Edition of the National Electric Code, the definition of premises wiring includes "wiring from the service point" to the outlets. The other ...
1 vote
3 answers
105 views

Subpanel is fed from Main Panel service lug and subpanels neutral and ground bars are bounded. Does not seem up to code

Images of the situation: https://imgur.com/a/icvh3Yk The previous home owner had this panel installed, or did it himself. It appears he just connected 4AWG cable to the main lug and fed that into the ...
1 vote
2 answers
71 views

ITE EQ Load Center neutral / ground update

Here’s an update on the main panel neutral issues that I raised originally in another question. I relabeled the photo, and made a diagram to show the problem. This post restates the issue, I hope more ...
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1 vote
2 answers
61 views

Sub-Panel Neutral and Ground

I think this panel wiring is pretty messed up but I want to confirm I'm looking at it correctly. My house is from 1960 and has mostly the original ungrounded wiring (2-wire cloth NM) for branch ...
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3 votes
2 answers
220 views

ITE EQ Load Center neutral / ground questions #3

In my 200A ITE main panel there's a feed to a 100-amp sub-panel that’s elsewhere in the basement, via a 100-amp breaker at the bottom of the main panel. The photo shows the wire (#1 AL, I think) and ...
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0 votes
1 answer
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Can I extend a 100amp Electric service wire?

I'm buying this house and the 100amp service wires coming from the meter, going to the main breaker box had been cut.. which left it 3ft shorter. My question is can run the service wires to a small ...
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0 votes
2 answers
39 views

Wiring subpanel from existing disconnect

I am adding a 70A 2 breaker subpanel to a shed and will have two (2) 15A circuits. I want to wire from a nearby, no longer used disconnect (230V) that was used for an air compressor. The disconnect is ...
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2 votes
1 answer
351 views

Can 90 deg C conductors feed a 75 deg C sub-panel if the feeder breaker is properly sized to limit current/heating?

What makes a main-lug enclosure rated for 75 deg C NOT usable for 90 deg C conductors? Assuming you used 90 deg C conductors in an application where the design (e.g. feeder breaker) limited currents ...
2 votes
2 answers
201 views

Appropriate "main panel" for outbuilding w/ 48A 240v circuit and 1 20A 120v circuit?

I have a 3-sided shed which is going to have a car charger in it (48A 240V), and one or two 120v 20A circuits. The car charging circuit won't be in use when any of the other circuits are in use. I ...
3 votes
2 answers
123 views

Proper way to repair a broken hot leg of a 3-wire subpanel run

My new house was built in 1980 (Virginia), and it has a detached garage. I went to install a 30A double pole breaker to power a 240V mini split, when I noticed the panel only had one powered 120V bus, ...
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0 votes
1 answer
78 views

1 Volt reading between hot phase of sub panel and enclosure and frame

My grounding bus in my subpanel, which is secured to the panel frame, reads 122 VAC to hot phase which is great. I also get 122 VAC from hot phase to neutral bus. Shouldn't I also get 122 VAC +/- ...
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1 vote
1 answer
45 views

400amp main pannel w/ 2x200amp circuits. What size/type of wire is required to run 200amps from main panel to another sub panel ~100ft away

This is the scenario: I have 400amp main service to my meter. I have a 400amp main panel that has 2x200amp circuits. The panel is grounded with bare copper wire 6ft apart with appropriate gauge wire (...
1 vote
2 answers
61 views

Replacing a sub panel

I have a existing 6 circuit 100 amp sub panel.It has the grounds running with the neutral wires. I need more circuits. I bought a 20 space main 100 amp breaker box. It doesn’t have a ground bus bar. ...
1 vote
1 answer
46 views

Requesting recommendations for upgrading a feed to a sub-panel [closed]

I have a small subpanel in my laundry room which feeds the laundry and HVAC equipment. It is currently on a 30A 2-pole GE THQP breaker. I had recurring problems with overload trips until I installed a ...
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1 vote
1 answer
64 views

How to size neutral if only/mostly 240 being used in an outbuilding?

I'm running a line to an outbuilding where the main use will be as a 48A vehicle charger. At most 2 120v circuits, one 20A and one 15A lighting. If I have #2 conductors, will a #2 neutral be ...
0 votes
2 answers
65 views

Connecting feeder conduit to outdoor subpanel

I am installing an outdoor subpanel and struggling to figure out the proper way to connect the feeder to the panel. I am planning to run 2,2,2,6 conductors in 1 1/4 PVC. The subpanel doesn't have any ...
1 vote
1 answer
54 views

How should I fit a new breaker for a subpanel in my main panel?

I want to add a 100 amp subpanel in my basement with a 60 amp breaker next to my main panel which is 200 amp. I want to run my basement lights on their own breaker. Right now my garage and basement ...
0 votes
2 answers
87 views

What is the model number for the breaker that fits in my Cutler hammer load center panel?

I have an older outdoor GFCI outlet on a dedicated circuit that trips periodically. I am planning on switching it with a regular outlet and a GFCI breaker in order to get the GFCI circuitry away from ...
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0 votes
2 answers
85 views

Installing Subpanel

I am planning to install a subpanel to serve two heat pumps with a surge protector connected to the panel to protect both pumps, and I am hoping for confirmation that my plan is sound. The main panel ...
0 votes
0 answers
28 views

Can a top plate on a 2x6 exterior walled be drilled for wires in 2 adjacent bays?

I am installing a 125A sub panel next to an existing main panel/ The sub panel will be in the stud bay next to the main. Both of these are on a 2x6 exterior load bearing wall. I understand the hole ...
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-1 votes
2 answers
91 views

Electrical Sub-panel feeding out through main panel service line entry

We are running electrical to our shed as an outbuilding. The primary issue is getting the lines back out of the house in a convenient location. My question is whether we can run this sub panel supply ...
1 vote
3 answers
279 views

What's the largest gauge THHN conductor I can add three of to an existing 1/2" EMT with 2#10 in it already?

Background I am planning to upgrade my garage by adding a sub panel to it. Currently two circuits' wiring comes out of my main panel in my bsmt, via about 2 feet of 1/2" EMT in to a disconnect on ...
0 votes
1 answer
94 views

240v panel-no neutral

This is the culmination of a few posts (Disconnecting 240 hots without disconnecting neutral?, 240v only subpanel, no ground?) to see if this seems right. I had a subpanel A with 20A double pole ...
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0 votes
1 answer
38 views

What type of conduit (if any) should i use for a 100A feeder to sub panel (service entrance cable)?

I am replacing an old fuse/buss style sub panel in a detached garage (overhead). The old wiring on the house and garage is/was a service entrance cable strapped to the side of the house and garage. ...
0 votes
1 answer
103 views

Is this sub panel installation according to code?

Am I missing something with the installation of this electrical subpanel? Concerned a little that the water outlet might be close but it's not in front of the panel and does not block access. This is ...
-1 votes
2 answers
92 views

What size breaker should I use for a subpanel?

For starters, this is in an RV in the United States. But the 120v electrical system is identical to a home just on a smaller scale. For specifics, it's a 50amp RV which is 110/220v split-phase. We can ...
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0 votes
3 answers
88 views

240v only subpanel, no ground?

I'm running a subpanel (new) back to my main area (main is full) so running it off another subpanel that was already there (old). I really only need this to feed my welder which is 240v only (plug is ...
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1 vote
1 answer
55 views

15A DF breaker keeps blowing at sub panel hot connection point

Problem: My single pole 15A DF breaker has blown twice (I stopped after the second time) at the hot connection point in a newly installed outdoor sub panel. My goal: I recently installed two new sub ...
2 votes
2 answers
157 views

200 amp subfeed off Siemens panel

I ran out of space in my "main" (sub)panel (A siemens PN4040B1200C) (my real main panel is the meter-main combo on the exterior of my house), so I'm trying to install another subpanel next ...
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1 vote
2 answers
86 views

Upgrade subpanel

I am looking to add a 240v 50amp outlet to my garage for charging the EV. With the help of folks on this forum I found that I need to expand my subpanel to add more breakers before adding a line to ...
0 votes
1 answer
63 views

Splitting up electrical lines to kitchen

I am beginning to renovate my kitchen and have a pair of 30 A breakers for the electric oven, and a pair for the electric stove. I am going to install gas stove and gas oven. I wanted to use one pair ...
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2 votes
1 answer
91 views

Grounding Main Sub-panel Sub sub-panel

I have a 200A main panel installed in our garage on an exterior block wall (single family, residential, construction in 1980). A sub-panel was added next to the main panel supply via a 100A breaker (...
4 votes
2 answers
151 views

Anything missing from my panel install?

First sub panel install. Anything I can improve on before calling for my rough-in inspection? Only thing I’m not sure of (and aware of) is that I’m using the panel as the ground between the second and ...
0 votes
0 answers
639 views

How many circuits can I add to a 50 amp subpanel?

I’m working with a sub panel that is rated up to 125 amp max. Currently it is wired with 6 gauge and has a 50 amp breaker in the main. How much more load can I put on the sub panel or how many more ...
0 votes
2 answers
136 views

Is my sub panel stealing power from my main

In a main panel I know if you use too much power at once you can over load the main panel, but I was wanted to know if the breaker in a main panel that you would use for a sub panel if it could be ...
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0 votes
1 answer
47 views

Added on to my cabin adding a 100 amp sub panel have a little less then 50 foot to run a feeder wire for sub panel in crawl space

looking to find out I have a 50 foot run from main panel to sub panel all in a crawl space I have 50 foot of 2.2.2.4 dyke Quaddrplex aluminum conductor underground direct burial 600v URD, can I use ...
1 vote
1 answer
88 views

Can a replacement service panel be installed alongside the original for temporary use as a subpanel?

We are about to start a major remodeling of our mobile home. This includes electrical because the way it is currently wired makes no sense and is probably unsafe and not up to code. The current ...
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3 votes
1 answer
896 views

Do I need a ground rod if I run a full sized ground to my detached garage for a 50 amp sub panel?

The NEC seems clear about adding at least 1 ground rod (possibly 2?). However, I was told by local electrical inspector that I don't need a ground rod if I run a full sized ground to my detached ...
1 vote
2 answers
156 views

Is my garage subpanel safe for 100 amps?

Not an electrician. Just wondering how much my subpanel can safely power. I have a 125-amp subpanel in my attached garage powered by two separate 6/2 NM-B cables with ground, run in the attic. ...
1 vote
1 answer
85 views

Different vintages breakers in main panel

I'm considering purchasing a house and I took a look at the electrical panel. The house was built in 1979 and at some point they added a sub-panel. The breakers in the original panel look like a ...
1 vote
1 answer
52 views

Grounding electrode conductor

I am installing a 125 AMP OUTDOOR MAIN LUG LOAD CENTER which will be protected by a 100Amp CB. The panel will support all the equipment for an inground pool. I have installed the pvc conduit ...
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0 votes
3 answers
130 views

Is it ok to have a ground Rod and a forth grounding wire in subpanel

I have an outbuilding (200 ft from house main panel) I have run a 4 wire to the subpanel but wanted to put a Ground Rod in after reading some things. Is it ok to have both or do I need to disconnect ...
4 votes
2 answers
110 views

Pool Load Center Wiring from Main Panel

UPDATE I was able to talk to one of my county building inspectors. I am fine to run Aluminum SER. I can run it all the way to the sub panel. I have to run fully insulated copper from the sub panel to ...
1 vote
1 answer
85 views

Can i run a 30amp rv outlet with gfi outlet with 30 and 20 amp breakers in box off my main 100amp breakers

I have a 100amp service with 2 100amp breakers under my meter. Can I run a RV outlet box with a 30amp breaker and a 20amp breaker for a 20amp GFCI outlet in the box off the main panel, or should I run ...
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4 votes
2 answers
596 views

Electrical - Conflicting opinions on sub-panel upgrade

My issue is that I am out of breaker space in my current 100A 8/16, 45 year old sub-panel. One electrician said that to add more space for potential circuits, they can swap the sub panel for a 100A 12/...
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