Questions tagged [circuit-breaker]

For questions generally relating to safety devices used to automatically stop the flow of electric current in the event of a fault condition. Use this tag for questions about fuses, too.

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7
votes
5answers
1k views

How to find maximum amperage need for fuse

My home has a 30A main fuse installed. The maximum sub-fuse is 40A. So upgrading to 40A seems logical. But actually I'd like to calculate the maximum fuse needed if I'd run (all/multiple) of devices. ...
1
vote
2answers
118 views

Electrical circuit with too many lights and receptacles on it

Recently during a storm a circuit breaker switched off half of our home's lights and sockets. Thinking it was due to moisture we waited for the house to dry and then reset the breaker. It would stay ...
0
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0answers
46 views

2 seconds of darkness

I got a 240 plug in room a, running 4 1000 watt lights. I got a table lamp in a 110 in room b When the 240 kicks on in room a, the light i have pluged into the 110 goes off for a second or 2 in ...
0
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1answer
35 views

Load Balance Electric Main Panel

Circuit breakers have to be attached to both sides of the electric panel in such a way that it balances the load. I would like to know if: I should ensure left circuit breakers Amp is almost same as ...
11
votes
1answer
4k views

Why are adjacent breakers for unrelated circuits ganged?

I'm looking at electric panels in some newer residences and seeing something confusing: Circuit breakers that are adjacent to each other, but that cover unrelated circuits, are ganged, as shown below. ...
1
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3answers
104 views

capacity of my electric panel

I see a 100 Amp breaker in the mains, which means my electric panel is 100 Amps. I see may arrays of circuit breakers on it, as many as 18. When I add the total amps on them, it adds upto 375 Amps. ...
0
votes
1answer
35 views

when I turn off the breaker, light goes out but I still see some voltage with my voltage checker

there are two switches in the box. One goes to an inside light the other goes to an outside light. i turn off the breaker and both lights go out. when I check with my voltage checker, I don't see ...
1
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2answers
58 views

How to compute breaker size for electric Stove + Oven?

I currently have electric appliance, and I want to replace them with newer units. These are the ratings of newer units I am considering: Induction Stove VICU53616BST - Maximum Amp Usage 240V - 48....
2
votes
2answers
105 views

Options for Running High End Computer on Old Circuit

I'm preparing to build the computer of my dreams. Unfortunately, it's going to top out at 1350 Watts when running at peak performance. I live in an 80 year old bungalow and the power situation is less ...
1
vote
1answer
60 views

My 100 amp box/panel seems to have lost the third leg

One leg reads 120 and the other power reads 16volts while the neutral reads zero. I'm not sure what the problem is.
2
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1answer
80 views

Unlinking outlet from the switch

I have a dimmer switch which is also controlling the outlet. Now when I dim the light and something is plugged in the outlet my ceiling lights start flickering. I want to make my outlet always hot. ...
0
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2answers
72 views

Voltage drop with Microwave

I've begun having problems with the voltage dropping when running the microwave (which is noticeable when the microwave slows down!). This does not happen with other high drawing appliances (washer/...
4
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3answers
324 views

Why is my wiring a fire hazard when we have circuit breakers?

A neighbor in my (US) building just found out that his laundry room (and others in the building including mine) are wired incorrectly. When the original washer and dryer were replaced, the dryer ...
24
votes
7answers
3k views

How can I add an ammeter and/or voltmeter to my home breaker panel?

In my professional life, I work in datacenters and all of our PDUs have ammeter displays on them. Of course they do: we always want to know how many amps a PDU is using. But in my house, nobody has ...
0
votes
1answer
130 views

Breaker Immediately Trips, Need Help Troubleshooting Why

I installed 4 Lithonia LED recessed lights on my living room 15 amp circuit. Everything was working great yesterday when doing final testing. I left the breaker off overnight as I was planning to do ...
3
votes
2answers
145 views

Microwave door interlock switch keeps failing

I have a 1000W GE "over the range" microwave (model JVM3160RF) that is now about 3 years old. Earlier this year, one of the interlock micro-switches failed (would not depress) which caused the ...
0
votes
1answer
88 views

What kind of electrical shock can that be?

edited to add some details asked for in comments So, there is that house in France with three phase electrical power. I don't know if this is relevant. And I can't tell the whole installation was ...
0
votes
1answer
42 views

Solar AC Disconnect - Fused or UnFused?

I'm installing a solar panel system with microinverters on each panel. An AC disconnect must be installed outside. I've learned that AC disconnects can be fused or unfused. - the unfused variety ...
1
vote
1answer
73 views

Powering a 120v Receptacle off of a 240v Circuit Breaker dedicated to an Appliance

I have a 240 volt 20 amp GFCI circuit breaker powering an outdoor appliance that has 2 electric motors and a motor control unit to synchronize them. I would like to wire a receptacle off of 1 hot leg ...
1
vote
2answers
52 views

AC Disconnect Ampacity - can fuse size be something other than 30 or 60 Amp?

I am currently hunting for an AC disconnect to sit between my main service panel and the AC power that will be supplied by my solar panel microinverters. Nearly every AC Disconnect I find online is ...
2
votes
1answer
83 views

Can/should I replace this 50A breaker with a 15A breaker?

I'm the recent owner of a 27yr old house. I'm looking to find more power for the basement that I'm finishing. There's a 50A circuit going to one of the outdoor AC units - but the info sticker on ...
1
vote
2answers
128 views

Is it dangerous to request more power from a mains circuit than intended?

Is it dangerous to attach devices using more than 3680W in total to a single 16A/230V mains circuit or is all I risk triggering the circuit breaker?
0
votes
1answer
103 views

Circuit Breaker Trips Immediately

One light switch in a 3 gang box trips the breaker every single time. This switch is for 3 exterior lights. All other switches and outlets on this breaker work fine. We moved into this house about ...
0
votes
2answers
62 views

Well pump with 15A fuses on a 20A circuit?

I noticed today that my well pump, which is 240V (USA) and is on a 20A dedicated breaker has dual 15A fuses: In 8 years in this house it has never blown a fuse nor the breaker. So I assume 15A is ...
0
votes
0answers
47 views

Replacing DC connection of 0 AWG with two 4 AWG cable

My Inverter is connected to my 300ah 12v battery bank via 0 AWG cables, I want to insert a circuit breaker into the positive connecting cable, I don't want to cut the cable but can I add a section of ...
0
votes
1answer
47 views

RCCB trips and causes sockets to lose power, but lights, etc. don't lose power

Several times in the last month, we have experienced small power surges that cause the circuit breakers to trip. Most of the time this has been the "sockets" circuit breaker, however 15 minutes ago ...
7
votes
4answers
3k views

Circuit breaker door shocked me. Static?

I was switching through breakers to isolate outlets. I had the panel door open, stepped away, and when I walked back to touch the panel's DOOR, I got a static-like shock on my finger. I was wearing ...
9
votes
4answers
5k views

Kitchen rewire gone wrong

We're renovating a hundred-year-old house that's been through several owners and has hodge-podge wiring. I've redone all the wiring from scratch in the rooms we've re-walled. Everything has gone well ...
1
vote
3answers
109 views

Feasibility (and cost) of swapping wires on circuit breaker panel

I'm going to be finishing the basement in my 28 year old house. Currently the entire basement (~1700 sqft) is going through a single 15a breaker, which isn't ideal. There's no room on the existing ...
10
votes
1answer
2k views

Can I swap out this 20A breaker for a 15A breaker?

I'm wiring my shed. There is a sub panel out back with a 20A breaker that supplies power to my pool light. I tapped that line to run the power to my shed because it's already ran about 3/4 of the ...
2
votes
1answer
50 views

two appliances on one 220 breaker?

I am trying to install a dryer at the far end of a large house. There is already a 220 circuit on a designated circuit running back there to operate a hot tub. The breaker box is full so no room to ...
6
votes
2answers
1k views

Which 50 amp breaker do I need for my old Eaton panel?

I have an old Eaton panel in my house with a 200amp supply. I need to install a breaker for a 14-50R receptacle for a car charger. The breakers in the panel look different from anything I see in the ...
6
votes
4answers
2k views

Diagnosing instant circuit breaker tripping, with nothing connected

I had a previous question regarding an AC, but now that I have disconnected the AC and the problem remains, I want to diagnose this problem a bit more. First step was seeing if this specific breaker ...
0
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2answers
55 views

RCBO independent circuit immediately trips, connected only to an air conditioner, what should I troubleshoot and what could be the problem?

I have a RCBO circuit dedicated to an AC unit. Obviously the AC is now off due to the fault. It has tripped once before, but I flipped it back on and it seemed ok. The AC stays off until I power it ...
2
votes
1answer
55 views

100 A GFCI breaker feeding a sub panel main lug

I have an outdoor sub panel that is a 100 A main lug. It is fed from the main panel by a regular 100A 2 pole breaker. I have several things that will be fed off the sub panel for a swimming pool that ...
0
votes
3answers
96 views

Can I add handle ties to QO tandem breakers?

This is a follow up to Why does a single pole tandem breaker allow connecting the switch handles? which was asking what circumstances handle-tied tandem breakers would ever be useful. (There are some ...
2
votes
4answers
853 views

Why does a single pole tandem breaker allow connecting the switch handles?

Specifically I am looking at a QOTO2020: You can see what seem to be holes in the handles for a connection pin. On a single pole breaker I can't think of an application where you would want both ...
6
votes
2answers
1k views

Electrical service sizing mix up in Mexico

Facts: The national electrical supply company of Mexico called "Comisión Federal de Electricidad" (CFE) oficially instructs users to install: A two pole one trip main interrupt behind the service ...
1
vote
3answers
84 views

should 30 yr old home have some/all breakers replaced with AFCI /GFCI? If so, which ones?

My brother-in-law, licensed master electrician was just visiting us. After looking at my break panel he strongly suggested I should replace most, if not all, of my CBs with AFCI. I have a 200A GE ...
1
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2answers
74 views

Replace breaker with Tandem

I am trying to get some extra space in my panel and am having a hard time finding a tandem breaker that will fit in this box (see photo), can anyone help?
0
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0answers
63 views

Brand new LG washing machine tripping AFCI combination breaker in new house

Hey this is less of a question than a problem I was able to trouble shoot, but I have a feeling other people might be going through the same situation and might have come up with other solutions to ...
0
votes
1answer
99 views

Can I install a switch upstream of my service panel for regular shuttoff duty?

I lived in Europe where it is common to have on/off switches on all electrical wall outlets. I asked my electical parts store if I could replace the cicuit breakers in my home with switch rated (swd) ...
6
votes
5answers
4k views

Can you trip a breaker from a different circuit?

Update: Thank you everybody for your input. Turns out, it had absolutely nothing to do with my shoddy wiring job (which I'll be cleaning up thanks to everybody's input). There was a switch on the ...
0
votes
2answers
125 views

Challenger Bus panel

I have a challenger panel with a burned bus and bad breakers. I'm looking to replace them. I called my local shops and they said they don't carry this anymore. Is there a replacement option without ...
1
vote
2answers
130 views

Can I remove the circuit breaker handle ties and treat them as individual circuits?

o.k., I get what handle ties will do, just not sure why you would use them? in the panel of my new home, there are quite a few (7-8) and I would just as soon remove the ties and treat all individual ...
0
votes
2answers
53 views

2015 Samsung Refrigerator/Freezer keeps tripping circuit

I move my Samsung unit to the garage and plugged it into a receptacle. It has been there for a year with no problem. Two days ago it started tripping the circuit every couple hours. I plugged it into ...
2
votes
1answer
70 views

Two ovens on one breaker: NEC says OK, but installation manual wants dedicated circuit

I have a situation very similar to using two oven in one outlet. I'd like to install a 30 amp GE Advantium 220v oven and a 20 amp GE thermal oven on an existing circuit with a 50 amp breaker. However, ...
0
votes
1answer
77 views

How to tell what is causing my breaker to trip

I have a 15 AMP breaker that will not stay on. Shut off lights, went to bed as usual and in the morning the lights would not come on. I inspected the breaker panel and found that circuit was tripped. ...
2
votes
1answer
57 views

Identifying neutral and ground in breaker box

Short version: In this breaker box to install a 14-50R would I run both ground and neutral to the same bus bar on the right? Long version: This breaker box is directly beneath the meter outdoors in a ...
1
vote
1answer
55 views

What is the difference between different rated RCCBs except for the price?

Say there's a need to install a 25A30ma Residual Current Circuit Breaker (i.e. ABB FH202 AC-25/0,03). It is going to be followed by a normal circuit breaker, to protect the wiring and the RCCB (16A). ...