MCB for bathroom light keep tripped.

10 years ago

My bathroom ceiling down light repeating tripped.
After I switch on the MCB of bathroom light then everything like normal. But after 5-6 hour (light switch no matter is on or off condition) this MCB for light tripped again.
I asked two different outsider wireman check bout this and every time they repair then went back, 5-6 hours after it's tripped again.
The outsider changed MCB but same condition too.
Anyone experience this before ??

Featured Answer

User

10 years ago

last modified: 10 years ago

Years ago I had a home in San Diego. The circuit breaker panel was outside. Most every day in the late afternoon, early evening, a ckt breaker would trip. This CB protected a bathroom and a couple of lights. The breaker would trip even with all of those loads at zero!

Oh, and I had aluminum wiring.

Turns out it took an electrician to help me out. There was a loose connection(s) in the breaker box such that under the heavier electrical load associated with cooking, electric lights, and the "heat" of the afternoon, the main was overheating. Physically adjacent to the main was the breaker that was tripping frequently. The electrician snugged up all of the breaker box connections and the problem never reoccurred.

(I put "heat" in quotes because it was typically 72 degrees... lol)

Sort by:Oldest

Comments (6)

Ron Natalie
10 years ago
What sort of breaker is this? GFCI? AFCI? Does anything else go out at the same time (other things on the circuit)?
mtvhike
10 years ago
What's an MCB?
Related Professionals
Albany General Contractors · Natchez General Contractors · Spring General Contractors · Laconia General Contractors · Portsmouth General Contractors · Binghamton General Contractors · Bennington General Contractors · Helena General Contractors · Shreveport Home Remodeling · Anderson Home Remodeling · Gary Home Remodeling · Baltimore Bathroom Remodelers · Marietta Bathroom Remodelers · Keene Bathroom Remodelers · Watertown Bathroom Remodelers
Ron Natalie
10 years ago
Miniature Circuit Breaker (pretty much all the ones used in residential use for other than the main). The term isn't much used in the US though...I'm wondering where the poster is.
User
10 years ago
If it trips after 5 hours with or without the light on, then why would anyone suspect that the light is the problem? There must be other things on the circuit besides one light? This kind of trip usually suggest a current close to the amp rating of the circuit breaker running continuously, and heating up the breaker, not a direct and immediate fault to ground, or the ground wire. Try turning all the lights off on the circuit and checking to see if there is still current going through the wire with an amp meter.
az_gochun thanked User
az_gochun
Original Author
10 years ago
Natalie@ After it's tripped, I tried all the MCB one by one but only that bathroom light MCB happening. After this I tried to turn off that bathroom MCB for a week time and no trip happening anymore. I checked on that MCB but only bathroom lighting affected.