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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5answers
10k views

What would cause an AFCI breaker to trip under no load?

I have an AFCI Breaker that trips with 0 load - nothing plugged in, no lights on. To test that power is getting to the room, I turn on the overhead CFL lights (very light load) and flip the breaker. ...
3
votes
4answers
11k views

Why won't my AC system turn off after I flipped the breaker?

We've got a central cooling air conditioner that was installed in 1984 with a thermostat from that same year. We are replacing the thermostat with a new programmable one (which has a 100% ...
10
votes
6answers
89k views

How do I add more circuit breakers once the breaker box is full?

My house was completely rewired by the previous owner. They tore out all the old knob-and-tube and replaced it with modern wiring. I definitely appreciate this, but unfortunately they left ...
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3answers
229 views

2 breakers powering 1 set of outlets

this is my first time posting a question to a forum like this. Electrician added a breaker and ran a line to an outlet that had power from a different circuit but had a short in it that could not be ...
3
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2answers
177 views

what steps to take after removing a cable from a breaker box?

While building some shelves in my basement, I noticed an electrical cable than ran along a joist and dead-ended. I tested it and discovered it didn't have power. As the dead-end is not particularly ...
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2answers
44k views

What are the differences between SDS, SDS Plus, and SDS Max drills?

Basically I had to use a breaker last weekend, it was clear I did not need the “heavy duty” as I did not have 6” of solid concrete, but the descriptions of the other options confused me.
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2answers
83 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 ...
3
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4answers
365 views

Why is the coiled white wire on a GFCI circuit breaker smaller than the branch circuit neutral?

I just recently installed a 50A two pole GFCI circuit breaker that was part of a 240VAC spa panel. For 50A I was using 6 AWG wires. When connecting up this type breaker you connect the two poles of ...
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2answers
31 views

New service continuity

This is a new 200 amp main breaker panel service and with no service drop yet. With main breaker off and with all circuits off I show continuity between neutral and the screw on the breaker when the ...
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2answers
76 views

my 220v circuit breakers show a voltage but dont seem to be able to drive a load. why?

im racking my brain trying to get my 220v electric cooktop to work. ALL 4 burners do not operate. i read 220v at all the proper places on the switches etc but when i turn a burner on... the voltage ...
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1answer
41 views

60 amp detached shop able to run 50 amp hot tub? [duplicate]

my house main panel is 200 amp, the shops panel is 60 amp. My new tub is closest to my shop but wasn't sure it would cause my shop to trip with the tub on its 50 amp gfci circuit? I was going to run ...
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3answers
229 views

Is this true about circuit breakers being out of phase in a house?

I just read this on another message board: If you know which breaker each outlet is on, it's easy. Breakers that are directly adjacent to each other (above/below or left/right) are on ...
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2answers
108 views

NEC Breaker Selection for Motor Loads

In the case of motor loads connected to a long branch circuit, why does NEC Table 430.52 limit selection of an over current protection device (OCPD) to a smaller size than the branch conductor will ...
0
votes
1answer
88 views

How many amps can this breakers box provide?

I bought a house from the early 80s and I'm trying to figure out how much amps I can use safely, if it is possible to add air conditioning on the current electric system, and in general if the current ...
0
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1answer
46 views

Wire size of unmarked wires

Can anyone guess the size of these wires? They are not marked.
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2answers
41 views

Wiring breakers

I left extra wire in the box in case I needed to move to another breaker do I have to strip the entire length of the orange wire or can I just strip parts of it?
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3answers
2k views

Oven suddenly tripping circuit breaker…bad oven or bad breaker?

We have a double Thermador oven in our house. We've owned the house for around two years, and the oven has worked fine up until the last few weeks. Now, using either of the ovens trips the circuit ...
2
votes
2answers
59 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 ...
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2answers
116 views

Switched outlet keeps tripping breaker

Re-wiring the garage and running into an issue with a switched outlet. The outlet is in the middle of the run (after a GFCI and before a single ceiling outlet for the door opener). I've split the ...
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2answers
53 views

My lamp was making a noise. Now it won't turn on. How to fix?

The lamps in my bathroom was blinking and making a hissing noise. I think the noise was coming from just one of the lamps but I'm not sure. Now I don't have any light / power in the bathroom. I ...
0
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3answers
451 views

Distance between floor and breaker panel?

How far off floor should circuit box be? Changing from 100 to 200 amp. Lead in wires are underground and come into bottom of box making them too short to connect.
0
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1answer
37 views

Circuity Breaker 2 pole Amp Label

Old breaker needs replacing. Is this a 2 pole 40 amp breaker (40 each pole) or a 2 pole 20 amp breaker? (20 + 20 = 40).
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0answers
145 views

how to wire a 220v 110v transformer at the circuit breaker

does some have a diagram that shows how to wire a 220->110v transformer at the main circuit breaker.. i have a wire ready with 220 and a another ready to receive 110v .. the 220v ready wire has has ...
0
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1answer
76 views

Evaluating possible early breaker failures

I'm leasing a commercial space and I have concerns about the breakers and electrical space. All the lights in the space are switched by the breakers, so the breaker box gets visited at least twice a ...
14
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1answer
2k views

Why does a USA/Canada surge-protected extension lead (110V) trip my circuit breakers in the UK (220V)?

I moved from Canada to the UK and for convenience I would like to use some of my Canadian aquired extension leads (for light power items such as ethernet switches). Problem is that the surge-...
4
votes
2answers
743 views

Why does my circuit breaker keep tripping for a lighting circuit?

I have 4 light poles with 70 wattage bulbs in it. What size breaker do i need to run all four of my light poles. I have a 20 breaker on it, but the breaker keeps on tripping. Please help me.
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0answers
63 views

How do I add a bell transformer to THIS consumer unit

I'm trying to add in a bell transformer to my existing Hager consumer unit. It's from about 1995. I live in England. The first image below shows the front cover, with five spare ways and their ...
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2answers
110 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 ...
0
votes
1answer
132 views

Kenmore washer won't start after tripping breaker

I've got a Kenmore top-loading washer, model #110.28782700. It stopped working in the middle of a load. I determined that it tripped a breaker, but after resetting the breaker, the machine won't start-...
3
votes
1answer
159 views

Water hammer or something else?

I'm having a bit of a mysterious problem. A couple of weeks ago I've replaced a dimmer switch in the upstairs bathroom. Of course while working on that I shut off the electricity for that part of the ...
0
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3answers
94 views

Breaker box that is full

My box is full and I have a gas water heater and trying to switch to a electric tank. Could I just take out two of my 110s and replace it w a 220v for the new tank.?
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2answers
177 views

50 Amp tankless water heater and 30 amp double pole switch

I just moved into a house. I have a 50 amp max tankless water heater. The circuit breaker is 50 amps. The water heater is connected to a NEMA 10-50 power receptacle. There a switch to turn on and off ...
0
votes
1answer
278 views

How to Hook Up 120V & 240V On AC Disconnect?

I'm attempting to wire a RV for hooking up to 50 Amp Service. Using a AC Diconnect (60-Amp 240-Volt 240-Watt Fused )connected to a (PowerMark Gold 125-Amp 4-Space 8-Circuit Indoor Main Lug Circuit ...
1
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1answer
8k views

Can you put a small breaker panel after a 30 amp breaker from main panel in the house?

Looking to run lights in my garage. If I put a 30 amp breaker in my main panel on a 10 wire to a small breaker panel in my garage, can I put 2-4 15 amp breakers out there for the lights? Likewise, ...
4
votes
1answer
292 views

Whats purpose of four pole breaker?

Was working on a friends house today. Mostly running a new branch circuit for an upgraded kitchen. That all went fine. The panel in the basement has a four pole breaker as the main. I've never ...
3
votes
3answers
4k views

Why does the breaker trip occasionally after I installed a new light fixture?

We bought a house a couple of years ago with a covered light fixture box in the ceiling (a blank cover over a wired box and a blank cover over the switch box). I recently modified a plug-in pendant ...
2
votes
2answers
317 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 washer, ...
0
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1answer
78 views

Trace a breaker to what it powers

I have started on the task of labeling all my breakers but in this process it has left me with one major issue, I have one breaker that doesn't kill anything in the house. During the checks every ...
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vote
2answers
166 views

How Do I Connect 00 AWG Wire to a 100A breaker?

I'm hooking a 100A service panel to my meter pan. There is the 100A disconnect panel on the right side that feeds the little house, I'm installing another panel on the left side to service my barn, an ...
2
votes
2answers
282 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 ...
5
votes
4answers
14k views

Why does my circuit breaker trip with any small load, even after replacing the breaker?

I have a 20A 240V GFCI breaker in my main breaker box going to a conduit to another breaker box outside. All worked well last summer. Now, when I put any load (weed-eater, light, etc.) on an outlet ...
1
vote
1answer
50 views

HVAC tripping breaker - things to check before replacing?

HVAC system (we're in Houston, it's still hot here) stopped working Tuesday. A/C guy came out, determined it was tripping breaker. Would trip immediately after resetting, but after a couple of ...
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2answers
122 views

Do I need a breaker in main pannel for sub pannel?

I have no breaker space in the main 200amp panel. I'd like to set a 100 amp sub panel with its own breaker. Can I connect the sub panel to the main entry lugs on the 200 amp panel?
1
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1answer
67 views

Is there any advantage of one of these types of switches over the other?

Shown in the photos below are two different 2-pole breaker switches in my circuit box. In order to turn the 15 amp switch on and off it must be pushed along a longer section of the breaker than the 20 ...
0
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2answers
430 views

Electrician Terminology “FAU”

I've noticed these letters several times written on the circuit breaker panel door. Does someone know what F.A.U. stands for in this context?
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1answer
1k views

How many ceiling fans and switches can I put on one breaker [duplicate]

I have a person that wants to wire in four light boxes and four ceiling fans with switches and I need to know if I can run all four of them safely from one breaker and if so what kind of breaker? This ...
7
votes
2answers
9k views

How much should it cost to add a circuit breaker?

In this question, I asked about problems between my circuit breaker for a circuit shared by my microwave and sump pump. The conclusion was that another circuit should be added to support the microwave ...
2
votes
1answer
202 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 ...
1
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1answer
77 views

What areas of a home are required to be AFCI protected?

I've got a Crouse Hinds panel with the majority of the breakers being of the ridiculous side connecting type. The panel and breakers are old and beginning to arc due to the lose connection. I've found ...
0
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0answers
93 views

I am having problems with my circuit breakers. can you help?

When I shut one breaker off all the power shuts off to 5 other breakers. What could that be?