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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4answers
3k views

Can I run a ground wire along the outside of conduit?

I have a sub panel on back of house. From main in garage is three wire. 2 hot one neutral. NO GROUND WIRE. Sub has a single bar used as neutral and grounds. Its bonded to case (Screw in). I will ...
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0answers
32 views

Separate ground/neutral bars in sub [duplicate]

OK..I have another sub-panel question. My sub has a 50 amp gfci that powers (old) spa. Currently this sub panel has a single neutral/ground bar. This bar is bonded, (screw is in), to the metal ...
2
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2answers
16k views

Is it ok to use a ground rod at a subpanel instead of a fourth wire?

I understand running the neutral wire back to the main service panel and not bonding the subpanel... but running the equipment ground back to the main panel seems to get conflicting answers. If ...
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3answers
3k views

Outlet tester shows “bad ground”

I have a brand new Square D sub-panel installed in my barn that replaced an old panel that had been there for many years and was deemed a fire hazard by the inspector. The new panel has a grounding ...
0
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3answers
594 views

Electrical Circuit for Detached Shed 200 ft

Would it be acceptable to run a branch circuit from a panel to a detached storage shed that will be approximately 200 feet away, instead of a feeder with sub-panel and grounding rods? The circuit ...
4
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2answers
3k views

Subpanel has neutral and ground bonded in detached structure - should I isolate?

I have a detached garage built in 1979 with a Cutler Hammer subpanel with a 3-wire 8AWG feeder (hot/hot/neutral) on 40A breaker from the main house panel. Subpanel has a dedicated ground rod ...
2
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1answer
157 views

Separating neutral and ground in panel

I have a 200 amp combination disconnect and 10 circuit panel on the pole feeding my 200 amp panel in my house. Is the panel on my pole considered my main panel and the one in my house a sub-panel ...
4
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4answers
1k views

Wiring up a subpanel in attached workshop

I need to wire up my attached workshop, which is about 50' from the main panel. I don't want to make a bunch of homeruns and would rather install a workshop-specific panel for this task. I will be ...
0
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1answer
221 views

How can we move a subpanel without replacing the supply cable?

We recently installed a subpanel, installed it ourselves and had it inspected. Now, as part of the ongoing renovation of the house, we have decided we need to move the panel over 22 inches. The 6 awg ...
6
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1answer
14k views

200 amp service entrance to 200 amp sub panel?

I have a 200 amp service entrance outdoor breaker box. I want to install an indoor breaker box with 200 amp service about 5' away so I can access breakers from inside the house. The actual wire run ...
2
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2answers
29k views

100 AMP garage sub-panel from 200 AMP house

I've checked a number of the other questions but not finding the specific answer I need. I'm wiring a 100 AMP garage sub-panel from a 200 AMP main in my house. I plan to install a 100 AMP circuit ...
4
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2answers
2k views

Does the bare wire in an 8/2 cable connect to neutral or ground at my sub-panel?

I am running electric to a building on my property. i have a 30 amp double breaker at the house panel and have ran roughly 110 feet of 8/2 with a bare ground and installed a ground rod at the sub ...
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1answer
422 views

Upgrading 30 amp to 50 amp for RV service

I was wanting to know it it would be safe to replace a 30 amp double pole breaker with a 50 amp double pole breaker. The 30 amp currently feed a well pump and a barn. The barn and the pump piggy back ...
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2answers
334 views

Can I use a 10/3 cable to supply a sub-panel for a tankless water heater?

I am looking to add a tankless ecosmart 27 water heater to my barn. I'm currently running a 60 gallon electric water heater supplied by a 240 line. However, the tankless system requires 3 supply lines....
1
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1answer
113 views

Can I use a spare #6 aluminum cable with no neutral to supply a subpanel?

I have a spare aluminum cable (#6 60amp with 2 hot and 1 ground but no neutral). I would like to use it to add a subpanel. Can I do this and where does the ground attach? Thanks for any help.
2
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2answers
128 views

How should I add 120V service to an outbuilding?

I need to wire a small building off of my main service. I will be running a few lights, a small TV, and a small fridge. I want to run two 120V lines to it. My question is can I run 10/2 using the ...
1
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1answer
469 views

Big Problem: buried feed to outbuilding sub-panel. Not really buried

So my shop foundation drainage project (3 weekends max) has now turned into a 6 weekend disaster. As far as I can tell, the previous HO, using bits and pieces of PVC he found here and there, pieced ...
3
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4answers
15k views

How can I determine if my neighbor is hooked into my meter?

I have several reasons to believe somebody is stealing my power. I decided to flip all the breakers... and behold my next door neighbor's exterior garage light turns off then comes back on but ...
2
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2answers
108 views

Sub-panel without any loads

I sold a hot tub that was on my property when I purchased it. There is a 240V sub-panel that powered the hot tub and it has one double-pole breaker. With the hot tub going away, what should I be ...
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2answers
646 views

Installing sub-panel, plus hot tub to new sub

Need to install a sub-panel off a 200amp service main panel that will be situated next to each other via 1" pvc conduit from bottom of each. The sub-panel is being installed to accommodate/supply a ...
0
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1answer
415 views

what kind of breaker for subpanel?

What kind of breaker do I have to use for a sub panel of 125 amps? May I use a 125 amp breaker (same amp rating as the sub panel) from main panel to feed the sub panel?
2
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2answers
445 views

Sub Pabel Install, NEC 250.24 question, Mixed ground/neutral at main

Did this install today on my home. How'd I do? I asked an old electrician and he said that I ought not to mix the Neutral with the Ground at the main like that cause "it could cause problems", ...
2
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1answer
1k views

Some questions on installing 125 AMP rated subpanel for 30AMP draw with 10AWG wire

I'm in need of a subpanel in the middle of my shop to wire up a few receptacles and lights fed from the 100 amp main panel which is being fed from the house. I have not much experience with wiring as ...
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0answers
48 views

what size wire do i need to ground sub panels together?

What size wire do I need to properly ground 2 sub panels together in Washington state? I have 2awg running panel to panel but don't know what size ground wire to install
1
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1answer
116 views

240 dedicated circuit to subpanel

I am adding a 240 volt dedicated circuit from main 200 amp surface mounted outdoor service panel. It will be used to power outdoor 50 amp subpanel. Run is 50 feet and plan to use #6 stranded copper ...
2
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1answer
486 views

Can I use a 150A cable to feed through a 200A breaker subpanel?

I am installing a 200A main breaker panel as my service disconnect. The Eaton BR816B200RF panel will have feed thru lugs on the bottom. I want to feed a 150A sub panel from those lugs. The subpanel ...
3
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1answer
684 views

I need to add a subpanel for my electric car, need to know wire gauge/breaker for main

My new car needs a charge station that will run off a 60 amp circuit breaker. I have plenty of room for the added load in my 200 amp service to the house, but not enough spaces to fit a new double ...
1
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1answer
155 views

Adding Ground Conductor from Service to Upgraded Sub-Panel

Upgrading electrical system with new 200 amp (main disconnect) service panel then underground 110 feet to house and a new 200 amp sub-panel. There is a 3 wire feed of 4/0 Au in 2" PVC conduit (with ...
4
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2answers
813 views

How do I wire up a shed for 60A service today with the ability to grow later?

I've been doing my research, reading tons of messages here and on other sites, and I think I know what I need to run power to my shed, but wanted to put it all together and have the collective mind ...
3
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1answer
3k views

How do I convert an existing electrical panel to a subpanel?

I'm going to upgrade my existing electrical service from 100 amps to 200 amps. Along with the service upgrade, I'll be moving the location of the service drop (part of a larger home remodel). I want ...
3
votes
1answer
2k views

Adding a new “knockout” to side of main electrical panel

I'm planning on running a 6/3 feeder cable from my main panel to the garage for a small 50A subpanel and am unsure of how to plumb the new cable to the main panel. All of the knockouts are on the ...
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2answers
406 views

What is considered “servicing” for NEC 225.30?

I previously asked a question (Grounding subpanels located ~100ft from main breaker) where I was informed of NEC 225.30, which states that a building [...] shall be supplied by only one feeder or ...
3
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1answer
252 views

Grounding subpanels located ~100ft from main breaker

Based on this question on EGCs in conduit (in the context of branch circuits) and this question on conduit as a sole ground source, I would like to know whether two subpanels, located ~100ft from the ...
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1answer
2k views

Using 10-2 vs. 12-2 for wiring

I am considering using 10-2 to wire the opposite side of my house because of 12-2 voltage drop over 60ft distance. My house is 54x58 (see blueprint below). I called up Leviton and tech support says ...
3
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3answers
17k views

What size wire for two 100 amp sub panels?

I am running two 100 amp sub panels from a 200 amp service. My question is the wire size. I have seen the chart via The NEC provides wire sizing based on the type to be used and the application. I ...
4
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2answers
3k views

Adding second Ground Bus to Square D Sub Panel - Grounded via wire or just the screws?

I have added a sub panel next to my main panel. It is fed from a 100A breaker using 3-3-3-5 CU Service wire. I removed the ground screw to isolate the Neutral and I installed the ground bus that ...
2
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1answer
982 views

Electrical panel ground issue

I just moved my shop to a new location here in sunny North Hollywood CA and was looking over the electrical panel and noticed there is no ground wire coming in from the service entrance. There is a ...
1
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1answer
103 views

Can a single set of conductors feed utilization equipment *and* a subpanel simultaneously under the NEC?

So, let us assume we have a set of conductors (hot/neutral/ground) going off to some piece of utilization equipment. Can I also run a set of conductors of appropriate ampacity off this circuit to a ...
2
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1answer
1k views

Continuous Load Definition for Feeder Wire

I understand that for feeder wire from a service entry panel to a subpanel the conductor wires need to be sized according to 125% of the continuous load plus 100% of the non-continuous load. I've also ...
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2answers
799 views

Direct Burial MC Cable

I want to install a 100 amp 230 volt single phase service from my house breaker panel to an external shop building. My house service is 200 amp 230 volt. Is it permitted to use direct burial MC ...
0
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1answer
98 views

Feeder Wire Ampacity

I am planning to run two sets of four-wire cables (two hots, one neutral, and one ground) through the same conduit to feed two subpanels from a single main breaker panel. I understand that I need to ...
5
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1answer
2k views

Can I feed 2 sub-panels off one breaker?

I have a 225A main service panel. I also have 2 sub-panels with 125A and 200A ratings respectively. There's a 100A 2-pole breaker in my main panel. I want to feed both sub-panels from that single ...
0
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1answer
2k views

Can I use a 70 amp panel for a 30 amp service feed?

I am running a subpanel off of a 30 amp breaker, I need to run a smaller subpanel off of that. Can I use a 70 amp rated panel for my 30 amp service feed, so that I will have room in the panel to put ...
5
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1answer
125 views

Is a grounded/neutral wire (not grounding wire) required to be run to a subpanel that will supply only 240V (2-pole) devices?

I'm installing a subpanel that will supply only 240V 2-pole devices. I'm positive I never will need the capability to run 120V (1-pole) devices. Am I required to run a neutral wire to the subpanel? ...
2
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2answers
3k views

Proper way to wire a sub panel to an attached garage?

I am planning to install a new sub panel in my garage. My concern is following proper procedure/code. I contacted the local building code office and confirmed that they follow the 2014 NEC. My main ...
2
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1answer
2k views

How can I build a subpanel off a 3 prong 220V dryer outlet?

I have an unused 220V, 3 prong (2-conductor) dryer outlet in my garage and would like to convert that into 2 110V supplies to some overhead lights and a ceiling outlet for a garage door opener. How do ...
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2answers
2k views

Breaker box below electric meter

I have an interesting question for anyone willing to answer. Below my electric meter outside there is a breaker box housing the 200 amp main shut off breaker as well as two 20A outside appliance ...
0
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1answer
160 views

Oven 3 Wire in Subpanel

I keep looking for a situation like mine on this website and other websites, but I was unable to find one. A 3 wire oven (two insulated hots and 1 bare twisted wire) is connected in an old main ...
4
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1answer
3k views

Arc-fault breaker in sub panel, pigtail to neutral bus or ground bus?

I recently replaced an arc-fault breaker in our subpanel that I thought to be faulty (it kept tripping at strange intervals around when I added a new dimmer, but I found no issues with my dimmer ...
2
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1answer
142 views

feeding 30 amps to detatched shed with 10/3 armored cable?

Can I use the existing 10/3 steel armored cable as feeder for a 240v 30 amp subpanel in my garage (detatched)? That's 3 wires and a grounded metal jacket. 2 hots (red and black) which connect to a ...