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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So, I was told by local electrical inspector that I dont need a ground rod if I run a full sized ground to my detached garage for a 50 amp sub panel

NEC seems clear about adding at least 1 ground rod ( possibly 2?). So, I’m thinking for protection from lighting strikes, which are common up here in the Adirondacks, I want those ground rods. Also, ...
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1 vote
2 answers
127 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. ...
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1 vote
1 answer
73 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 ...
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1 vote
1 answer
41 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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3 answers
62 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 ...
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4 votes
2 answers
62 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 ...
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1 vote
1 answer
64 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
509 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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2 votes
1 answer
69 views

AC disconnect vs. Hot tub disconnect?

I've finished the run from my Main to my new subpanel. The subpanel is not within the required 25' of my hot tub, I have a 50 amp GFCI installed in the subpanel which is dedicated to the hot tub. I ...
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3 votes
2 answers
637 views

Should a subpanel in the same building have its own grounding rod?

I'm installing a subpanel on the opposite side of my home. To be clear the subpanel will be attached to the same structure as the main panel (the main panel does have a grounding rod), just on the ...
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  • 121
0 votes
1 answer
33 views

Can I use two hots in a 10-3 wg to power a 60am cir 115' away from main load center to power sub panel

We ran 2 20 amp connections over the 10-3 and Now I am wondering if I can use the current two hots. to power a sub panel @ 50 or 60 amps 240. Thanks, D
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2 votes
1 answer
67 views

How to get subpanel cable into wall cavity when going through the top plate isn’t an option

SER from attic to stud bay, top plate not an option I’m looking to run a feeder from my main panel to my attached garage for a sub panel. The problem is the wall that I will have the subpanel mounted ...
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4 votes
1 answer
331 views

Can conduit be laid on the ground under a low deck?

I'm planning my run from my main breaker panel to a hot tub subpanel. all wiring will be in PVC conduit. At first, the plan was to bury the entire run. However, as it turns out I could greatly shorten ...
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0 votes
2 answers
123 views

Subpanel main circuit breaker trip but not the smaller branch circuit breakers

I have a problem with my 100 amp sub panel in my garage. I'm using only one 40 amp branch circuit to power a service unit to charge my Nissan Leaf. The service unit is connected to the 40 amp breaker ...
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1 vote
1 answer
73 views

Old subpanel on boathouse

You are going to tell me to call a licensed electrician but someone needs to tell me how to find one. I am all about qualified electricians, but my last 2 experiences with a licensed electricians were ...
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2 votes
1 answer
245 views

How to join two electrical boxes through a wall?

I'm replacing a 1960s vintage sub-panel for my laundry and air-conditioner. I'm also looking to install a disconnect at the A/C compressor. The new sub-panel is inside the wall of the laundry room, ...
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0 votes
1 answer
58 views

New shop feeder size

I am running 100A to my shop 150 ft from the house. Just making sure my math is right. (2 conductors× 150ft × 21.2 ohms for aluminum × 100 amps)/ 7.24V volt drop= 88,334 cir mils. So looking at 1/0 ...
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0 votes
2 answers
59 views

50 amp GFCI to Plug-On-Neutral subpanel?

I'm adding a subpanel that will include service for a hot tub. The panel I have selected happens to be a Square D Homeline 125 amp 8-space 16-circuit PON. I'll be using a Square D Homeline 50 amp GFCI ...
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1 answer
80 views

Do I need a 200 amp sub panel for my tankless water heater?

We are installing a tankless water heater that requires *3 50 amp 2 pole breakers. We are running new wire from the main breaker to a sub panel that will have those breakers in it and from there to ...
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2 answers
69 views

Steel electrical boxes downstream of a 100 amp subpanel

Do steel electrical boxes need to be grounded downstream of an unbonded 100 amp subpanel?
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0 votes
2 answers
163 views

Un-conduit 3-3-3-5 CU SER feeder cable through studs for 100 amp sub panel 4 ft away

I'm thinking of using an un-conduit-ed SER cable to feed a 100A sub-panel to avoid running 3 separate THHN cables through an EMT conduit (+ maybe a redundant ground). The panels are 3ft away from each ...
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3 votes
2 answers
129 views

Is 12/2 cable to subpanel ok?

My gf's 1940s house in the US. The house is on a newer 200amp box, but the garage has the old glass screw-in fuse box. The main supply coming into the garage is 12/2 and appears to be tied into the ...
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  • 608
3 votes
0 answers
58 views

Can I use a recessed subpanel in the wall between house and attached garage?

I am planning to install a subpanel in my attached garage, with most likely a 70A feed from the main panel. Can the subpanel be the recessed type that fits in the wall cavity between 2 studs, in the ...
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0 votes
1 answer
46 views

Transition from NM-B to THHN/THWN-2 for an attached garage subpanel

This question is similar to others, however similar questions suggested are over 5 years old. The work has not yet begun, but here is what I am thinking. I am running a 50A 240V circuit from my main ...
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2 votes
0 answers
55 views

Is there an exception to running a fourth ground wire when upgrading a sub panel

I am upgrading a 1950 homes sub panel from a fuse panel to a breaker panel. It’s is a three wire system running the fuse panel. The panel is down stairs on a interior wall about 50 feet from the main ...
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1 vote
1 answer
64 views

Can I run a home run to the main breaker in an attached building with a subpanel?

I'm working with an installer on a solar system that can power essential loads when the grid is down, and this requires moving all essential load circuits (refrigerator, boiler/furnace, etc) to a new ...
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0 votes
1 answer
60 views

3 campers require a 30amp breaker each and one camper requires a 50amp breaker. What size main breaker do I need do the sub panel

3 30amp breakers for 3 campers 1 50amp breaker for 1 camper Total of 140amps needed to accommodate the 4 campers The main house panel has a 200amp main. What size breaker do I need for the sub panel ...
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0 votes
1 answer
45 views

Can I Split subpanel from two different feeds

I'm curious how to make this work in a pinch as I'm having to update my business wiring in 3 months for renovation.It'll eventually be a larger amp panel or two seperate panels Current I have a small ...
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0 votes
1 answer
58 views

100 amp Sub panel from aQO 200 Amp 2-Pole Outdoor Circuit Breaker Enclosure with QOM2200VH Breaker

I have an outdoor 200 amp service disconnect (QO 200 Amp 2-Pole Outdoor Circuit Breaker Enclosure with QOM2200VH Breaker). I am trying to figure out how to run a 100 amp sub panel to a new garage ...
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0 votes
1 answer
82 views

Subpanel Grounding

I have an existing wire run from my main panel on the house to a detached garage with three wires: Red, Black and White. No ground. I want to install a new subpanel in the garage. I'll be installing ...
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0 votes
1 answer
46 views

Lost power to sub panel

I have a double 50 breaker in service panel and wires go to power my sub panel . Always had 120 volts at hots on double 50 and 120 volts coming into each leg in sub panel. A couple guys had to mess ...
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2 votes
1 answer
157 views

How can I extend PVC Conduit already installed?

I recently bought a house with an exterior garage. The previous buyer only had an on/off panel installed on the outside with a single Romex running to one receptacle for the garage door opener. I'm ...
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0 votes
1 answer
70 views

Replacing Subpanel in Garage - Double Check

First, thanks to all for the wealth of info on here. Been a huge help. Fortunately or unfortunately, the information I found helping me install a transfer switch also turned me to the fact that my ...
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0 votes
1 answer
73 views

What gauge wire is needed to feed a 100A subpanel that's next to the main panel?

The subpanel will be just a few inches from the main panel. Looks like more or less 3 feet of cable will be used. How thick should the copper conductors be?
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1 vote
1 answer
80 views

Best way to transition from conduit through finished walls/ceilings to main panel for 100 amp subpanel

The conduit and outside wire has already been run, it's 1.5" sch40 pvc with 2-2-2-6 xhhw-2 wire running from the shop panel to inside the house (A). My plan was to splice it in a 12x12x6 junction ...
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2 votes
2 answers
187 views

What are benefits of a subpanel over pre configured 6 , 8 or 10 circuit Transfer Switch Kits? which one is better for Portable Generator?

I am planning for a Generator based power back up. Need to have the back up to run the sump pump in case the there is a power outage in Spring when the snow melts making water flow in my sump pit and ...
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1 vote
0 answers
38 views

Can I have 100A main breaker with 100A main panel for solar panel?

I have an inverter with 21A output current. And will existing 100A main busbar with existing 100A center fed main breaker? I was looking online and there are articles about NEC rules for center fed ...
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2 votes
2 answers
119 views

Finishing an outbuilding that has an existing subpanel but I have some concerns after opening it up

Would anyone mind to validate/assuage my concerns as marked on the image here? Even after some research I'm hesitant on #1 (maths) and #2 (best practice vs. code requirements). And of course if ...
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2 votes
0 answers
114 views

Ground Rod in Raised Garden Bed

My detached garage has a subpanel fed by 3-wire plus ground from the main panel on the house. It's 8AWG copper conductors plus 10AWG ground breakered at 50 amps. In the distant future I may run new ...
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2 votes
1 answer
106 views

Can neutral and ground be bonded only at a subpanel?

I live in a developing country where there isn't much in terms of electrical codes and electricians often aren't very detail-oriented. I recently had a solar system installed(Victron Multiplus-II –), ...
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0 votes
2 answers
112 views

Ground wire in subpanel

I'm adding a circuit to a subpanel in my garage (built in the late 70s), and I've been reading a lot about subpanel ground / neutral bonding (how it's not supposed to be bonded at the subpanel, and ...
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1 vote
1 answer
103 views

Running cabin feeder off 200amp panel

I'm in the process of figuring out how to wire a park model cabin to my existing 200amp service. The crux right now is sizing my feeder wire appropriately. I currently have 2-2-2-4 MHF running to a ...
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1 vote
1 answer
102 views

Will #2 THHN Aluminum fit a 90 Amp breaker?

Based on a previous question regarding wiring a hot tube, I've decided to run #2 THHN Aluminum from my Square D main panel to the hot tub sub-panel, this would give me the ability to expand in the ...
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  • 121
0 votes
3 answers
149 views

Upgrading wiring to detached garage subpanel

My garage is a 2 car detached garage is approximately 33ft from the house. My current setup (previous owners doing) is a 15a breaker (main panel) to 12/2 UF in a metal (aluminum?) piping that runs ...
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2 votes
1 answer
71 views

Generator hookup

I am looking to install a portable generator for supplying some things when there is a power outage. I have my main panel outside and a sub panel inside. The breaker at the main panel suppling the sub ...
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0 votes
1 answer
71 views

Convert 30amp 240; 30amp 120 sub panel

New to the group here and hoping for solid guidance. I have a 240v water heater that was removed as the house was converted to a gas exterior unit. The 30amp supplies the 240v on a 10-2 wire. What I’m ...
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4 votes
3 answers
2k views

Can I install two 60 amp EV chargers on a 100 amp subpanel?

I have 200amp service for the house and I'm looking to potentially add capacity for two EV chargers in the garage. I'm hoping to install two EV chargers that can charge up to 48 amps each. I know that ...
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2 votes
1 answer
212 views

Running electric to sub panel in detached garage, can I use a flexible conduit in my basement?

My understanding is that feeder wires need to be in conduit for the whole run, but running schedule 40 through my basement joists seems awful and maybe impossible. I’m wondering if I can use a more ...
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2 votes
2 answers
112 views

Splicing Feeders from Meter/main shutoff to multiple sub panels/outbuildings

Thanks to anyone who has the time to help me out. I will explain my situation and then ask follow up questions. I have property with a 600' driveway leading to a cabin (a small workshop). There will ...
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6 votes
5 answers
919 views

Risk of bonding neutrals and grounds in sub-panel

I am replacing my complete electrical service entrance (weatherhead, meter box, breaker panel in the house). The meter housing I have chosen is a meter/main combo that will have a 200 AMP breaker. So ...
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