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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31 views

240V on all 120v outlets and ceilings lights [duplicate]

In a remote studio have a Sub-Pannel with Multimeter readings. With No Circuit Breakers In Place (L1 to N 120v) (L2 to N 120v) (L1 to G 120v) (L2 to G 120v) (L1 to L2 240v) (N to G 0v) slim type ...
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3answers
58 views

Where do I attach the Ground and Neutral inside a sub-panel?

I'm wiring 100 amp subpanel to detached Garage with 2/2/2/4 copper. I'm hoping to replace the subpanel to my detached garage which was previously wired to run on a 40 or 60 amp subpanel with like 6 ...
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1answer
74 views

Can I use an existing range circuit for a new sub-panel?

Lots of good information out there but wanted to confirm that what I'm learning is accurate and also ask a little about aluminum wiring. Context/Background I'm finishing my basement (one bedroom, an ...
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1answer
49 views

Turning on GFCI breaker on subpanel trips main breaker

I have a subpanel feeding off a 50 amp breaker. The subpanel contains a GFCI 50 amp breaker which is connected to a new 32amp spa heater. When I flip the GFCI breaker on for the heater, it immediately ...
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4answers
351 views

Help choosing an outbuilding sub-panel

I'm wiring a shed to use as an insulated tech workshop. A 20A circuit for 10 outlets, 15A for lights, and a 20A for a mini-split A/C. My main breaker appears to be 150A. Should I just match the 150A ...
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1answer
43 views

Want to add sub-panel in my barn - 115v, 60amp?

I'm looking to extend the dedicated electrical in my barn to a new sub-panel near where I will be placing hobbyist wood working power tools - miter saw, route, jointer, small lathe, table saw, etc and ...
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2answers
78 views

8 AWG solid EGC in raceway for 100 amp subpanel

I'm adding a 100 amp subpanel to my detached garage and have a question about the EGC I've already pulled through the underground LFNC-B raceway. Taking the advice from a similar post on this forum, I ...
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1answer
43 views

Is there a minimum height for a small sub-panel?

A few years ago I installed a very small sub-panel for hot tub and one outlet. The panel is mounted on a stem wall outdoors about 1.5' off the ground. It only has 2 breakers in it: a 240volt for the ...
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2answers
66 views

100 Amp Shed Workshop from 200 Amp House Panel 120' Direct Bury Cable [closed]

I am interested in some advice/support on installing a 100 Amp Main Breaker Sub Panel approximately 120' from my 200Amp Main Panel in my basement. I have a background and experience in electrical ...
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1answer
62 views

Sub panel feeder circuit wire sizing

I’m planning to upgrade the service in a detached garage, which is currently fed by a single 15amp circuit, and I wanted to confirm that I have my circuit sizing correct. The existing circuit runs ...
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1answer
48 views

Do I need to add grounding and replace breakers at my sub-panel?

I doubt this is legal for the most part, but I have a 240v subpanel on my insulated tiny house, shed whatever you wanna call it. Right now it's my office, but a while back I set it up with a 240v 30 ...
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3answers
59 views

Calculating subpanel breaker size

I'm building out a shop (within the same building as the main panel) and I'm considering adding a sub panel to make running circuits easier, and to make any future expansion easier. I'm unsure how to ...
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2answers
66 views

Power jumping from one hot to another

I ran 2 4/0 lines to a new horse barn from our shop to a sub-panel. The sub-panel has a ground rod. When the breakers are off the volt meter on each 4/0 line reads 120 but as soon as you turn any ...
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4answers
91 views

What type of electrical supply is this? (Canada)

I'm interested in buying a home-energy monitoring product, the type with current sensors that clamp onto one or more main electrical feed wires. In order to determine what products would work, and ...
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1answer
57 views

Grounding branch circuits in gutter instead of in panel

Replacing a sub panel (with neutral from main panel and local ground rod). The branch circuits will come in via a Wiegmann gutter above the subpanel. Is there an issue having a grounding bar in the ...
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1answer
52 views

Can you feed a sub panel from a timer for outside lights?

I have a Intermatic 240v 30 amp timer and would like to feed a sub panel with (6) 120v 15 amp outlets for Christmas light
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0answers
48 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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31 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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2answers
52 views

Subpanel breaker sizing in detached shed with electrical feed from breaker in main house panel

I want to feed 240V 30A from a new 30A breaker in my home main electric panel to a new subpanel in a adetached shed. The electric feed I want to use for the new subpanel is (4) 10awg THWN wires (R/B/...
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3answers
818 views

Garage upgrade from 20 AMP to 50 AMP

I bought a house recently and I have some experience with electrical but I am not fully sure what would be the best course of action since I've never had a detached garage where the cable would be ...
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2answers
51 views

Minimum distance between main panel and feeder?

I'm running very short on space in my main panel. And I'm adding a second mini split air conditioner right now that needs another 240v breaker, and would eat the last space in my panel. Rather than ...
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3answers
945 views

Will #2 copper THHN be sufficient cable to run to the subpanel?

I have a 200 Amp Main panel. I have an outbuilding 150 ft away in which I need to install a sub-panel. I proposed to install a 200 amp sub-panel so if sometime in the future we choose to get a ...
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2answers
68 views

Can I use an existing Ground Rod for Sub-Panel in Detached Garage (Meter box is using the rod currently)

Two buildings: Home and Detached Garage (circa '04 US). Service comes in through a Meter on the Garage to a PVC conduit into the Main box in the home (Single phase 240V with Neutral). In the main box ...
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3answers
91 views

Max load on a 30Amp Sub Panel

1st post so go easy :-) and hoping someone can help. I am currently investigating the feasibility of this and whether to approach an electrician on it (i.e. is it even possible without massive rework)...
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0answers
48 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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1answer
49 views

Can I tie grounded/white and ground/bare from a subpanel to any grounding bar in in the main panel?

Suppose I'm wiring a 100 A subpanel, which receives my two phase wires (black, red/black), my grounded/neutral wire (white), and my ground wire (bare) from the main panel. Since this is a subpanel, ...
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1answer
59 views

Reusing old service wires from electric furnace to mini-split

EDIT to answer replies: @3phaseeel 30-amp wires are 6 AWG aluminum, 50-amp wires are 4 AWG aluminum. The sheathed wires run along the garage roof truss overhead (see picture), exposed for about 28 ...
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2answers
315 views

Is conduit required when running a short distance to an adjacent 60 amp subpanel?

I am installing a surface mounted 60 amp subpanel 5 inches to the right of my current surface mounted main panel. For the short run, can I use 6/3 non-metallic cable w/ground between the two panels ...
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0answers
81 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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0answers
64 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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1answer
31 views

Is 10/3 @ 240 with ground good enough for a short run from sub panel to sauna heater?

I'm no pro, so I'm sorry in advance for doing my own work, but I enjoy the learning and experience. I've run aluminum 4/3 out to a new sauna with a sub-panel, roughly 100', which houses 2x single pole ...
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2answers
160 views

How to secure supply wires to panel

I'm installing a subpanel that is fed by 3 #1 conductors and a #4 ground (Al, XHHW-2, individual wires). I would like to use a 2-piece clamp to secure to the subpanel and to protect the wires from ...
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3answers
95 views

What is the maximum sub-panel amperage I can use, and is my setup okay?

I would like to install a sub-panel in a garage by running cable underground. I have 60' of 2-2-2-4 aluminum service entrance cable -- gray jacket, 3 conductors insulated. While I have 60', the ...
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2answers
490 views

Wiring of a metal detached garage?

I am looking to add power to my detached metal (enclosed carport) garage. With that said I am trying to figure out the most economical solution to wiring the garage. I would like to run the wire like ...
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1answer
144 views

How to find a neutral to ground short on my main panel

I've just installed a subpanel in my attached garage. The rough in has passed inspection, however my main panel has standard breakers and has never had fault finding interrupter breakers in it, and ...
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1answer
38 views

Is AFCI required for detached workshop subpanel?

As I read the 2014 NEC 210.12 AFCI protection is only required for a "dwelling unit", which would not include a detached workshop. Is that interpretation correct?
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1answer
36 views

Can sunpanel be mounted to horizontal 2x4?

I read that subpanels should be mounted to a 3/4" backer board or secured directly to a stud. Can I nail two 2x4s horizontally between two studs and secure the panel to those?
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1answer
98 views

What component do I need to add my own “Private” electric meter

I am adding a workshop, and upgrading my service from 200A to 400A. The Shop will get a 200A panel and the existing House panel will be backfed from the main. I want to bring the new House feeder ...
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4answers
1k views

Can I run 275ft underground cable to pole barn?

I have a new 1500 sqft pole barn that needs electric. I expect to need 100Amp service at the barn which will have a 220V 15A compressor and 220V 25A welder. The rest of the barn will be 110V ...
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1answer
87 views

Main panel grounding

I have installed a 200 Amp meter upgraded from the old 60 amp and then installed a 200 disconnect with a breaker type switch inside then feeding 200 amp main panel. My question is do I bond neutral ...
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2answers
78 views

How do I properly size the ground wire for a subpanel?

What is the general rule for sizing ground wire relative to the conductors? I know I saw this somewhere on here, but I cannot find it. I'm running aluminum (#1 AWG aluminum) to my subpanel and I'd ...
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1answer
58 views

Bare neutral to subpanel in detached garage

I have an old house with a detached garage. There is power to the detached garage through a 3-conductor cable that is routed above ground. Power from my house comes from the power pole, to my house. ...
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2answers
65 views

How do I add 2 AFCI circuits to my panel?

My electrical inspector told me I have too many devices on my basement circuit. Which is accurate :) I need 2 additional AFCI circuits for: laundry room and basement receptacles. Problem is, my panel ...
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1answer
168 views

Do I use the Siemens Type Q Breaker in ITE Blueline Loadcenter panel?

I'm looking for compatible breakers for my old ITE Blueline Loadcenter main panel. I believe ITE was bought by Siemens. Would the Siemens 100A 2 Pole 120/240V Type Q Breaker (https://www.homedepot....
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1answer
65 views

Is there a proper way to fill an electrical panel?

I'm installing a subpanel and will submite a panel schedule with my permit application. I have never installed a panel before, so I wonder if there is a proper way to install the breakers. Should ...
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0answers
43 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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2answers
85 views

Appropriate installation for a detached structure electrical sub panel?

I currently had an irrigation pump and small shed 125' away from my main panel. This pump and shed electric is fed underground in 1" pvc pipe with #10 THHN 220v (neutral/ground/2 hots). I removed ...
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3answers
138 views

Can SER labled XHHW-2 be buried in conduit

I've read many good answers here regarding what types of cables (conductors) can/cannot be buried. I've come across blanket statements like "SER cannot be buried, even in conduit." I want ...
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3answers
902 views

Sub panel neutral and ground not bonded so why continuity between them?

I have a 125A GE PowerMark Gold Load Center "subpanel" at my detached garage. Subpanel has 2 hots, one neutral with no "connected" ground between panels. The subpanel ground bus ...
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0answers
54 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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