39 votes

What type of cable should I bury for a small utility shed?

Why bury a cable when you can be future-proof? The primary issue with direct buried cables is that you have to dig them up in order to upgrade them, a costly proposition. Hence, it's a far better ...
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34 votes
Accepted

GFI outlets tripped after power outage

Some brands of GFCI’s trip on power loss. I first found this when putting them in on a bathroom sink outlet that was switched. Every time the light switch was turned off the GFCI tripped when the ...
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  • 97.8k
30 votes

subpanel breaker tripped as well as main breaker - should I be concerned?

Grats on your successful generator test :) Whenever you have a bolted fault, you flow hundreds of amps. The only thing that impedes flow is the resistance of the wires themselves, which you can look ...
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26 votes

I do not have power to all my breakers

Oh dear. This is a foogly mess. First, you did the right thing by punching that main panel breaker down onto a single. The problem is with the subpanel; it is very badly misconfigured by a guy who ...
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25 votes

What type of cable should I bury for a small utility shed?

I'm going to be a bit contrarian and say 10/3 UF. It's pricier and overkill for your existing setup, but here's why it could be worth doing it now. A single 12/2 means you only get 20 amps at your ...
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  • 20.1k
18 votes
Accepted

Are the grounds and neutrals in this electrical subpanel reversed?

Whoever wired this panel simply was not paying attention The installer who wired this panel did not pay attention to the schematic on the label, assuming that removing the bonding strap was enough ...
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16 votes

Why does a subpanel need separate ground and neutral?

Bonded ground/neutral If you have the neutral and ground bonded at a subpanel, then you'll get neutral return current through the ground wire back to the main panel (since there are now multiple ...
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  • 28.3k
15 votes
Accepted

How to use a 100 amp sub panel for a 50 amp input

Just wire it up. There is no problem using a sub panel that can take more current than you will ever feed it. Points to note: The cable to your hot tub will be rated for 50A (not 100A); therefore ...
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15 votes

Are there safety concerns or code violations with my garage sub-panel?

It is bad, more than a few violations here if I understand what is being fed. First violation no clamps /bushings coming into the panel 2 places. Next a 40 amp breaker feeding #12 possibly 14 awg wire ...
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  • 97.8k
14 votes

Federal Pacific 200a main panel problem with oversized 100a 2pole breaker

The 100A breaker is overcrowding the other slots for a reason: to enforce stab limits. Even a stopped clock is right twice a day, and FPE got that right. If you did what you wanted to, you would ...
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14 votes

GFI outlets tripped after power outage

Ed's advice is correct. For a time, some builders of GFCI devices considered this behavior to be a "feature". Undocumented, of course. This is largely gone from the market, so I would cautiously ...
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14 votes
Accepted

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

I'm going to focus on the modern way to do this, since it's so very correct that I'd almost call other ways wrong. The newest EVSEs provide for that. Use them. I.E. don't make the thing harder than it ...
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13 votes
Accepted

Running electrical to a shed

Generically I'd knee-jerk to conduit and 30A 240V service with a sub-panel, but if your needs are going to be adequately met by 20A 120V power and the loading is sufficiently low that the voltage drop ...
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  • 136k
13 votes

Sub panel install issue

I'd be seriously tempted to email that picture to the licensing board... I assume from your question that this was installed, incorrectly, by licensed electricians. Buy a ground bar to fit your panel, ...
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  • 136k
12 votes

Can I connect a 100A subpanel to a 100A main panel?

Let me try and answer some of your questions. First the panels you are looking at that are rated 100A simply means you can use them for any application up to 100A. You can for example add a 60A ...
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12 votes

Considering doing a 100A sub panel install on my own. Any guidance would be much appreciated

I can tell you right now that that liquidtight is too small for what you want to do The AC installer likely ran either 1/2 or 3/4" for the LFMC, depending on the size of the circuit. That's going to ...
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11 votes
Accepted

How to properly ground a subpanel in detached building?

Pull 4 conductors (2 ungrounded (hot), 1 grounded (neutral), 1 grounding) (250.32(B)(1)). Grounded (neutral) and grounding bus must be separate at sub-panel (250.32(B)(1)). No need for a GFCI breaker ...
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  • 128k
11 votes

Can I connect a 100A subpanel to a 100A main panel?

If your panel is full, you'll likely want to have the service evaluated, to determine if it's still large enough to meet your needs. It's possible that you may want to upgrade to a larger service, ...
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  • 128k
11 votes

Running electrical to a shed

In the USA you get to play fast and loose with this. If you simply extend with 12 AWG, you'll have 0.6% voltage drop per amp that you draw... so a 1/4 amp battery charger won't give any drop at all, ...
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10 votes

What is wrong with this panel wiring?

I've labeled your image, to help you understand what's going on. Off to the left, the grounding electrode conductor enters the box and terminates at the grounding bar. The feeder coming in the top of ...
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  • 128k
10 votes

I do not have power to all my breakers

Edit: I wrote this answer before the photo was added. I will defer to Harper’s answer that goes into much detail about the problems. You have a 240 volt sub panel which was fed from a 240 volt ...
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  • 8,108
10 votes

What type of cable should I bury for a small utility shed?

I've built several such sheds, and a #12 UF-B (moisture and UV light resistant) cable (usually gray) is appropriate on a 20A breaker (or smaller). Depending on where you are it may need to be buried ...
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  • 106k
10 votes

How to use a 100 amp sub panel for a 50 amp input

It's a rating. Like tires. Go shopping for tires. Almost any tire these days is rated 112 mph. *You're allowed to drive 65 on those, it is saying don't exceed 112 mph*. It's the same with ...
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10 votes

Can I run 275ft underground cable to pole barn?

Your first, and only question that I see, is whether or not you can run 275 ft. of underground feeder wire to your barn. The answer is: Yes, you can provided you use wire large enough so that the ...
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  • 20.5k
10 votes

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

Normally, your panel can be way oversubscribed. That's because most loads are either not on at the same time (heating vs. cooling, only some cooking appliances, etc.) or use far less than the breaker ...
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9 votes

Considering doing a 100A sub panel install on my own. Any guidance would be much appreciated

This is a "walk in the park" with enough knowledge, but what you've said reveals some gaps. Also an EE degree can do more harm than good, because it encourages you to overthink or "outsmart" the NFPA....
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9 votes

Garage upgrade from 20 AMP to 50 AMP

Buried conduit is considered wet location. Romex typically refers to NM cable, which isn't approved for wet location. Depending on conduit size you might be able to run 6/3 UF if you can find in quad ...
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9 votes

Add a 80/100 amp subpanel to 125 amp main, or upgrade service/panel?

Blame all those glorified toasters for the fact your service is already oversubscribed The source of your load calculation problem, quite bluntly, is the 19kW of electric resistance heat fitted to ...
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8 votes

Should I bond neutral in sub panel- there is no electrical ground

If you're in an area that has adopted National Electrical Code, you'll have to run a 4 wire feeder. You'll also still need the ground rods at the shed, which you'll bond the grounding bar in the panel ...
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  • 128k
8 votes
Accepted

What should I do if the AFCI breaker neutral pigtail is too short?

The AFCI wire needs to connect to the neutral bus. Put it on the other side, or add on to the length of the wire with a wirenut.
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  • 19k

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