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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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24 views

Main Load Center for subpanel

Can a main load center box with no main breaker be used as a sub panel in a detached garage. Was told to run a #2 copper since it was about 150 ft away from the house.
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47 views

Meter base with main breaker

I have a few questions about this kind of meter base: My house currently has a meter base which does not contain a breaker. The wires from the meter immediately enter the wall to my house's main ...
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2answers
55 views

Can a sub-panel have a larger main breaker than the feeder breaker in the main panel?

I have a weird setup that I'm trying to configure, but I'm only 90% certain of my logic (and with electrical items I want to be 100%). I have a new 400A meter/main combo unit with 1 built-in (...
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3answers
60 views

Outlets for 2 sheds

I want to run a couple of lines from my main box, 1 for 50 amp for my RV and then I want to have 9 shop lights installed (4 to run on one switch and the other 5 on a second switch) and 5 110 outlets ...
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GFCI Breaker Serving GFCI Receptacles Tripping in Extreme Fog and Cold

Lately, I have had an issue where sometime during the night the main GFCI breaker would trip. The only thing different on the nights that this happened was that one of the nights was (1) extremely ...
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1answer
147 views

Can I do a 125A subpanel feeder with slightly-larger-than-#3 wire?

How they are all connected: With all the details and data given below. So Can I do a 125A subpanel feeder with slightly-larger-than-#3 wire? This is detail directly related to the post. Question. ...
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2answers
33 views

Does a subpanel ground need to be insulated wire

I am installing a 60amp subpanel and want to ground the panel to a grounding rod. I have 8awg non insulated copper and want to know if it can be used for this or does it need to be insulated. It will ...
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37 views

3 wire subpanel to a new 3 wire subpanel

I want to add a 100 amp RV service panel to my existing, detached garage, 3 wire subpanel. I understand that my current setup is grandfathered in and code is now 4 wire but I won't be able to add this ...
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46 views

Ground size for 100 amp sub panel 200ft away

I would like to install a 120/240 volt 100 amp sub panel on a detached garage that is about 200 ft away. I have read that one should strive for a voltage drop of less than 3% and from what I can tell ...
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2answers
59 views

Main Breaker Panel or Main Lug Panel for Sub-panel in Attached-Detached Garage

I am installing a ~100-amp sub-panel in my "attached-detached" garage (an "attached-detached" garage is a detached garage that shares a continuous roof with the home). The sub-panel will be fed by my ...
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44 views

How to wire a sub panel from a 15 amp circuit existing run

I'm adding power for an outdoor pond, I will need four outlets in the end. I have an existing 15 amp circuit out of my main house service panel that connects to an outside wall. I want to tie into ...
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93 views

When splitting a 240v circuit, what happens to neutral's amperage?

My garage has very limited power with only one outlet that I share with 3 bathrooms and every outdoor outlet, 4 total, on a 20 amp breaker. (House hastily thrown together in 97' for your reference) I ...
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1answer
51 views

Is my ground correct at my subpanel?

I have a subpanel at my garage. It has 2 hots, one neutral and one ground from the service panel. The neutral and ground in the subpanel are not bonded. All the outlets including GFCIs all work ...
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1answer
71 views

Can I run just one wire to the sub-panel via schedule 40 separate from the others?

I have a 25 year old recalled sub panel, three wire, converting to new Eaton 100A. Want to add a wire to meet code Is it allowed by code to run just one wire to the sub panel via schedule 40 to the ...
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1answer
61 views

Grounding a 3-wire sub-panel in attic

Early 1960's home. 200-amp main service panel on first floor. 3-wire (L-L-N) feeder to 100-amp sub-panel in the second floor attic, about 25-30 feet from the main service panel. Neutral and ground ...
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2answers
64 views

Mount subpanel on below grade stem wall

I am redoing my basement and I am putting in a new subpanel to handle a few extra circuits since my current panel is undersized (I wanted to replace it, but according to the electrician who I’ve been ...
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1answer
83 views

Does a sub-panel in an outbuilding require a ground wire or rod? [duplicate]

My main elect panel in the house has a common neutral/ground bar and not separate bars. If I run from this panel to a sub panel in a detached pole barn and attach the two hots for 240V and one ...
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3answers
169 views

Can I add a subpanel?

Let me start off with the facts: I have 125 amp service that is fed via overhead lines to a center fed panel. I am maxed out on breakers, as every 110v breaker is now a tandem breaker. When other ...
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1answer
56 views

Use existing 200A panel as temporary sub-panel off of new 320A service panel

Currently I have 200A electrical service that's brought to my house above ground and into the basement on the right side of the house, which feeds a 200A panel. I'm in the process of getting my ...
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1answer
68 views

Is the blue conduit connected to my sub-panel suitable for a 50A branch circuit?

I have to add a 50 amp circuit to the sub panel in my garage. I found one of the open knockouts in the top of the panel to have a blue flexible conduit looking stuff in it which runs up into the ...
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94 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.). ...
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1answer
96 views

How to deal with subpanel that does not have ground wire back to main panel

I am in the process of renovating a house that was built in 1933, and had an addition put on in the 1960's. Original 1933 panel is 100 amps. When the addition was put on, the electrical drop was ...
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1answer
73 views

Junction box above ceiling to add second sub panel from existing sub panel feed

I'm posting this question to determine if there is a safe manner to do this that meets code and isn't a redneck solution. The sub panel in my garage is run off a 50 amp breaker that is in my service ...
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1answer
65 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 ...
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1answer
314 views

When did the NEC code start to require the separation of neutral and ground bus bars after main disconnect?

You gave the answer below to the question of the requirement for separate bus bars after the main disconnect box ... my question is ... In what year did the NEC start to require this separation? What ...
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1answer
65 views

Can I do subpanel this way?

I need 240VAC, single phase, 27 kW at 113 amps. Required breaker is 3 x 40 Amp I don't have enough space for (3) 40 Amp in my panel. Question is: can I kill 30 Amp (hot water heater) breaker and ...
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1answer
51 views

Adding subpanel to a shed

Thanks in advance for anyone providing insight for me. I apologize if answers for my situation can be found in another post that I've missed. I have a shed outside my home that currently has no power....
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2answers
158 views

What conductor and burial depth are appropriate for my garage subpanel circuit?

We are building a 2-story detached garage. The upstairs will be my wife's studio. She is a painter and quilter. The lower level will be a standard garage for tools, etc. I do not plan to weld but who ...
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1answer
27 views

Wiring a compressor to an external building

I have run 2,2,2,4 in conduit underground to a 100amp box. In the house the ground an neutral are bonded together but in the shed they are separated(isolated). I'm connecting a compressor through a ...
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2answers
38 views

Metal or PVC Conduit in Metal Outbuilding?

I'm running wiring under ground from main panel to 100 amp panel in metal garage. When installing lighting and receptacle circuits mounted against interior walls, does it make any difference what ...
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3answers
93 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 ...
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1answer
88 views

How to wire main feed in a tiny house subpanel for 120v and 240v?

Initially, I'm going to be plugged into basic 120v from an outlet. However, I'll be moving in a year, and want to be able to plug into 240v if available. How to achieve this flexibility in the ...
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1answer
144 views

Adding sub panel, odd main panel configuration

I am in the process of adding a sub panel to a detached garage and I have the proper gauge wire connected up to the sub panel (neutral and ground NOT bonded) with 3 conductors + ground running in ...
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2answers
53 views

Other than unforeseen surge in draw, what can cause breaker tripping?

My house originally had a single main panel, 150A. Some years ago, I decided to split the basement apartment and the main unit. The original main panel is in the basement but I wanted the main unit to ...
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1answer
109 views

Yes, I'm dumb - I drilled into wall backing my electrical panel

so... I was drilling into a wall and the drill was having a hard time. I figured I just needed to keep going and I did and it finally went through. Afterwards I realized my electrical panel was ...
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34 views

60A sub panel located 220' from source…in conduit..what guage al wire to meet ONT Elec code?

I want to wire a 60A subpanel that is 220' from the main source. The wire will be AL and run through a buried conduit.... Must meet Ontario Electrical code
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2answers
57 views

Powering Subpanel from CSED via Feed-Through Lugs

I'm wiring my house and would like some feedback on the sizing and routing of conductors between the exterior service entrance and an interior subpanel. On the outside, I have installed a combination ...
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2answers
460 views

Why does my subpanel have 4 wires feeding into the lugs?

Background: This is a sub-panel for my pool equipment (filter pump, cleaner pump, and pool light). The wires coming from the main panel come in through the bottom, and the wires going out the left ...
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3answers
267 views

Can I install a 60A main breaker in a load center rated for 125A?

Following my previous question about feeding a sub-panel... I have access to a new-in-box 125A load center, which is more current than I need, but the form factor is good. Can I drop to a 60A feeder ...
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0answers
37 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 ...
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2answers
122 views

Question about subpanel install in a shed

I am not an electrician, so let's get that out of the way. However, in the past I have installed simple subpanels in detached buildings and had my electrical work inspected and passed first time, so I ...
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3answers
144 views

Old Fuse Box Used As A Subpanel

Home built in the 50's has a fuse box that's currently being used as a subpanel in the garage. The garage is attached to the house by the means of a 8 foot wide enclosed breezeway/mudroom. My problem ...
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2answers
318 views

Single neutral bus bar in subpanel with 2 columns of breakers?

(Questions in bold at the bottom) I recently purchased a Siemens E0816ML1125S load center for use as a subpanel in my basement: I installed a ground bus bar, located horizontally under where the ...
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2answers
71 views

2 pole 240v AC circuit breaker wire connections

If the neutral is not needed on a 2 pole 240v AC circuit to what should it be connected? My new oven has a black, red, ground, and a white wire. The wire from the circuit breaker has the same 4 wires. ...
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1answer
116 views

Add sub panel from transfer switch

I'd like to add a subpanel to add a couple circuits (Extra inverter Mini Split ACs, well pump, etc.) but my main interior panel is full and recessed in concrete. I added a manual transfer switch from ...
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1answer
287 views

about NEMA 6-15 plug/receptacle for 240 V

The NEMA 6-15 plug/receptacle for 240 V power supply looks like the following: https://en.wikipedia.org/wiki/File:Nema_6-15.svg The two hots obviously should be connected to the two hot wires in the ...
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1answer
168 views

no ground bar in electrical subpanel

I found that the subpanel in our newly built home may not have ground bar, though it has neutral bar. I attached photos for confirmation. Please let me know if there is any code violation. The house ...
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2answers
162 views

Should the ground lug be bonded in my sub-panel?

I have 200 amp service at the house. I want to install a DP 60 amp breaker in that panel and run # 6 wire approximately 150 feet (10% added for swag) overhead to a dog rescue building. The building ...
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1answer
242 views

Is a Redundant Ground at Sub-Panel Permitted? Useful?

I've searched the forum and haven't found an answer for this exact situation. Here's the configuration: Main 200A service panel at one end of house (exterior), and 100A sub panel at opposite end of ...
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2answers
347 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 ...