For questions generally relating to safety devices used to automatically stop the flow of electric current in the event of a fault condition.

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2
votes
4answers
19k views

Three dead power outlets, no tripped breakers

A few days ago I was using a multimeter to check for current to the thermostat on my garage refrigerator. I wasn't thinking and did something wrong (wrong HOT, I believe) and power to the refrigerator ...
2
votes
1answer
188 views

Main breaker on load center won't open

I was in the process of connecting a Reliance generator trow over switch , although the job was completed , I was trying to shut off power to the entire house by opening the main breaker but would not ...
2
votes
2answers
1k views

What's the amperage on a circuit breaker that's “linked” together?

On our circuit breaker, we have several circuits that are linked together by a metal handle. For instance, there are several cases of three 20A circuits all linked together, meaning you can only flip ...
2
votes
3answers
2k views

How can I shut off circuits when I have a generator with an automatic transfer switch?

We had professionals install a generator with an automatic transfer switch. I showed them our circuit-breaker box and told them which circuit numbers should be on generator power. Okay, everything's ...
2
votes
3answers
210 views

Distributing load in electrical panel

I am in the process of rewiring my house. The house was built in 1950 and even though the service panel was upgraded in the early 70's to a Square D 200 amp service, the system is ungrounded and will ...
2
votes
1answer
114 views

How do I read the usage information my electrical meter sends to my power company?

I would like to keep an eye on what information my power meter sends to my electric company. Is there a way to use, for example, powerline networking to read what usage statistics the power meter ...
2
votes
2answers
680 views

Any reason not to leave unused breaker in the panel?

My main panel has a couple unused slots, but the metal tab covering those slots has already been removed. One of those slots has an unused breaker, the other one used to have a plastic filler panel, ...
2
votes
2answers
454 views

How much current should I expect this motor to draw when it's running steadily?

This fan lists its "Max. Amperage" as 3.2. I assume the motor draws that much when it's first turning on, then settles down to some lower current. How much current should I expect it to draw when ...
2
votes
1answer
192 views

How can I determine the rating of an unmarked dual-pole circuit breaker?

I would like to install a new electric cooktop. The panel has a dual-pole breaker serving the current electric cooktop but there is NO marking on the breaker to indicate the rating. The new cooktop ...
2
votes
1answer
799 views

Replacing 10 amp breaker for 20 amp

I'll try to keep this short but there is a bit of background info that may be needed. Couple of days I rented a floor grinder to eliminate uneven concrete floor in the basement. The grinder kept ...
2
votes
2answers
12k views

Why is half of my house without power with no flipped breakers? [duplicate]

The master bedroom and middle bedroom of my 3 bedroom mobile home is without power. None of the breakers have flipped. I even changed the breaker that controls that part of the house and my ceiling ...
2
votes
3answers
1k views

Any problem with installing two identical circuit breakers in series?

Suppose I want to reduce risk of a circuit breaker malfunctioning and failing to disconnect a shorted circuit. What if I install two identical breakers sequentially (one after another) so that if one ...
2
votes
1answer
950 views

15 amp load trips 20 amp breaker instantanously

New construction wired by professional electrician, Montana USA. Dedicated circuit for a 14" chop saw with 10 ga. wire and a 20 amp breaker. Saw was used previously on a 15 amp circuit with no ...
2
votes
2answers
427 views

What size replacement fuse is required for this hot tub?

I recently had a power outage that blew one of our air conditioning fuses (which we were able to fix) and one of the fuses (out of two) in our spa equipment service control board. Next to both fuse ...
2
votes
1answer
134 views

Does this arc fault breaker manage one or two circuits?

I recently tested our breakers to see what was mapped to what. In the process of doing this, I noticed that our arc fault breaker is handling a LOT. Specifically: 4 bedrooms 2 bathrooms Family ...
2
votes
2answers
666 views

Did I damage the breaker by incorrectly wiring a generator?

During a power outage I attached my generator incorrectly (I have never done this before - I just was not paying attention). Anyway, I crossed the ground at the box with the black. When I turned on ...
2
votes
2answers
106 views

All Outlets on Breaker Randomly Give ~8V

All the devices on one of my breakers randomly stop working, and when checked with a multimeter, I see that the outlets are giving a voltage of ~8V rather than the ~125V I usually get. When I check ...
2
votes
2answers
105 views

Connecting 2 GFCI Breakers to 2 Hot Leads and 1 Common

So I just bought my first house and in lieu of changing loads of outlets in the kitchen for GFCI outlets I went with two 20A GFCI breakers. Upon going to install the breakers I found that the cable ...
2
votes
4answers
149 views

Breakers tripping

USA (California) home with 240V 150A service. I have a contractor working on the house siding. He accidentally drilled though NM-B/Romex on a 15A circuit. (The repair of this is not my question and I ...
2
votes
2answers
637 views

How do I go about determining how to wire a breaker box in a cargo trailer

I'm about to wire a cargo trailer with construction equipment, table saw, miter saw, air compressor, drill press, and a few other small tools. Only one tool and lights will used at one time. So here ...
2
votes
1answer
108 views

How to wire ground when the sub-panel is Plug-On Neutral

I need to install a sub-panel in my home. Both the main panel and the sub panel are in the same building. I purchased a Square D Homeline Indoor Plug-On Neutral panel (Model # HOM2040M100PCVP) for ...
2
votes
2answers
80 views

Can earthing of a building degrade over time

The building is almost 12 years old. We didn't have this problem before. But in this last 2-3 days some residents complained they have experienced shock coming form the pipeline of bathroom even after ...
2
votes
2answers
937 views

Where can I find information on slow blow breakers?

In a previous question, the comments mentioned slow blow circuit breakers. I have done a web search and went to Square-D's website(the maker of my current breakers) and came up empty. There is a lot ...
2
votes
1answer
48 views

Should I replace an old breaker or add a new one?

Our old circuit breaker for our water heater seems to be at the end of its life. However, the breaker also controls our well system, and the breaker is only 20 amps. Is it okay for us to just replace ...
2
votes
3answers
512 views

Can I replace the main breaker in an electrical panel with a smaller one?

I have an older 60amp fuse box in a rental property that is wired as a sub panel off my main 100amp service. I would like to upgrade to a new circuit breaker panel so tenants can not pull out the ...
2
votes
2answers
101 views

Testing circuit breakers?

I have a panel of type XO circuit breakers in my house. One of them has failed closed (!) and I need to replace it. However, a few minutes on Google seems to indicate that this type of breaker is no ...
2
votes
1answer
406 views

How do I recognize which socket cover (fused or 3-pin) connects to which outlet?

I have two power outlets in this room, one is a normal 3-pin (UK) plate cover and the other is a fused (switched) plate cover (much like the one below). I've know removed them and wish to put them ...
2
votes
1answer
74 views

200 amp panel box with some circuits not working

200 amp breaker box in a mobile home. Power just suddenly goes out on all but two breakers/circuits. Each functional circuit is on opposite sides of the panel left side is one breaker down the right ...
2
votes
2answers
58 views

Will powerline networking work in my home?

I'm thinking of starting to use powerline networking for my pc, but I heard that if the outlet near my modem and the outlet near my pc are on different breakers, powerline networking won't work. How ...
2
votes
2answers
276 views

How can I add arc-fault protection to circuits in this panel?

In my sub-panel that services the home I have 4 separate 20 amp circuit breakers all strapped together to trip all if one trips. On these individual circuits are the garbage disposal, clothes ...
2
votes
1answer
273 views

Is it possible to fry a lamp's internal wiring if I put the wrong bulb in?

I went to the hardware store pulled a bunch of LED bulbs off the shelf. One of the bulbs found its way into the wrong box and had a significantly smaller screw base than your typical light bulb base. ...
2
votes
2answers
389 views

Do I have to run new wire when replacing my electric oven?

I bought a new single electric wall oven to replace an old one in an old house. It says it requires 20 amp and 240 volts. The old one was running on a 10 amp breaker. The wire from the breaker to oven ...
2
votes
1answer
804 views

20amp breaker trips with NO load…Continuity between black & white wire at electrical box

I have a 20 amp breaker that connects to one wall in my kitchen. It operates 3 outlets, a microwave and two other outlets used for a toaster oven & the last a blender. On the blender outlet ...
2
votes
2answers
988 views

Can a laptop cause an AFCI to trip?

just stumbled onto this site and crossing my fingers that someone will be able to help. My problem is the tripping of an AFCI every 3/5 weeks when a 2nd TV is turned on. Sometimes soon afterwards, ...
2
votes
1answer
382 views

Is my water heater connected to GFCI and is it affected after short circuit?

I am an absolute n00b when it comes to home electrical systems. Please do forgive me if this is a repeat question since I wouldn't know what to search for. I am in France and I have 230V supply at ...
2
votes
1answer
131 views

How can I determine if there is any damage to the conductors of a circuit?

I recently went to replace a couple 3 way switches and, I am ashamed to admit, did not do my due diligence when wiring up. The new switches were a different style and the wiring configuration was ...
2
votes
1answer
4k views

What could be causing a new 20 amp dedicated circuit supported by a GFCI breaker to trip? [duplicate]

I installed a dedicated 20amp circuit home run to support a single duplex outlet in a bathroom. The GFCI breaker is wired correctly. However, When I plug in a load such as a light a the breaker ...
2
votes
1answer
3k views

Why is the circuit breaker for my furnace stuck in the off position?

The breaker for my furnace is stuck in the off position. We were away for the winter and had someone shut it off, and now the breaker won't turn on at all. We shut off the thermostat upstairs thinking ...
2
votes
2answers
5k views

How do I connect a timer to circuit box which controls our outside lights?

Currently our outdoor lights are being controlled by the circuit breaker in the box. We want to connect a timer to the circuit-breaker. There is a junction box with Black, White and a bare ground ...
2
votes
1answer
542 views

Why does half the house go out when a single breaker trips?

The breaker box at my brother's house is well marked and balanced except when a breaker is tripped half the house goes out. I'm currently living on the third floor of his house. When I turned on a ...
2
votes
0answers
26 views

Maximum breaker on NMD7 8/3 wire?

My mother in law recently replaced her 4 burner Frigidaire range and is often popping her breaker when she is cooking for a large party - ie 4 burners going and oven. I checked the specs for the ...
2
votes
1answer
55 views

Device keeps tripping AFCI device

I have a BedJet device that I run at night that keeps tripping the ARC-fault breaker in my bedroom after about 30 minutes of running nearly 70% of time (other times it works just fine). I have tried ...
2
votes
1answer
233 views

New install: What's causing a tripping arc fault breaker?

We remodeled our home and had all new electrical put it in to plan. For rough-in, the electrician put in regular breakers instead of arc fault breakers. Arc fault breakers are required by code now ...
2
votes
2answers
242 views

Why does a GFCI breaker trip when another breaker is accessed?

I just bought a new house, and on the first day there realized a breaker was tripping. It is one of only two GFCI breakers in the box. It's 20 amp with a bedroom/bathroom on it. I tested every outlet ...
2
votes
2answers
1k views

Use of combination CAFCI and GFCI breakers instead of recepticles

I am about to begin a project that will include one or two new circuit for outdoor lights and receptacles attached to the main building. I will probably installing a new home run line from the panel ...
2
votes
5answers
594 views

Low voltage fuse blowing in furnace

I have an outside A/C compressor and indoor furnace fan combo in the attic. The unit was off and the 3 amp fuse was blown. I replaced the fuse and used the thermostat to turn the fan on followed by ...
1
vote
3answers
88 views

Circuit Breaker change

I am changing a Federal Pacific Electric Co. Circuit Breaker double 40amps but I can't find one. Can I use a double 50? It's for a wall oven?
1
vote
3answers
20k views

What did I do wrong??! Wiring error is tripping circuit breaker

Here's the scoop: There are 3 switches in my hallway. One switch on side A and two switches on side B. Side A switch controls same light as one switch on Side B. I replaced the switch on Side A ...
1
vote
2answers
246 views

Identify type of circuit breaker

My house came with a main panel that supports this type of circuit breaker. However, I am unable to find that type at the store and the breaker doesn't say what type it is. I thought it might be ...
1
vote
2answers
8k views

How do i know if my service panel will accommodate a 240v circuit breaker

We are looking to install a hot tub and trying to find out if our service panel will accommodate a 240v circuit breaker. This is what our panel says but I do not know what all of this means: ...