Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-03-2012, 01:38 AM   #1
Newbie
 
Join Date: Jun 2012
Posts: 4
Share |
Default

Bath fan throwing breaker


So I put a bath fan and light in a bathroom off a master bedroom. There had already been a light there, I just knocked out the junction box and made the hole bigger. Everything works fine now except when you run a blow dryer. You can turn off the fan and everything else in the room but if you run a blow dryer it will throw the circuit breaker after about a minute. The bedroom and bath are on the same circuit and the fan is the second thing on the wire, then it goes on to a whole bunch of other stuff.

Cdy291 is offline   Reply With Quote
Old 06-03-2012, 07:13 AM   #2
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,398
Default

Bath fan throwing breaker


Sounds like the circuit was close to overload and the added load from the fan is pushing you over the top. You could check this with an ampmeter.

__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 06-03-2012, 07:15 AM   #3
Member
 
Join Date: Dec 2008
Location: Wilmington, DE
Posts: 3,118
Default

Bath fan throwing breaker


Hair dryers generally use about 1200W, which is most of 15A circuit. If there is anything else on the circuit, that could be enough for it to trip. It is always possible there is a weak breaker.

Current code requires bathrooms to be on a dedicated 20A circuit, which is usually enough to run blowers, fans, etc. If the fan is also a heater fan, that should have its' own circuit. GFCI outlets are required, and AFCI may be required, check local code.
Just Bill is offline   Reply With Quote
Old 06-03-2012, 07:52 AM   #4
Electrical Contractor
 
rrolleston's Avatar
 
Join Date: Oct 2011
Location: Granville, NY
Posts: 1,941
Send a message via AIM to rrolleston Send a message via Yahoo to rrolleston
Default

Bath fan throwing breaker


Same problem we had I ended up spliting it up so bedroom was separate 15 amp circuit and bath fan and light along with kitchen hallway and laundry lighting were moved to a 15 amp lighting circuit and a new 20 amp dedicated circuit was added for the bathroom counter. You just have to figure out where it goes from one room to the next to break it up. I ended up fishing and pulling three wires. If you have attic or crawl space sccess you should be able to fish the wires.
__________________
With Electricity there is the right way to do it and the dead way. Just because it works does not make it safe.
rrolleston is offline   Reply With Quote
Old 06-03-2012, 09:55 AM   #5
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Bath fan throwing breaker


Quote:
Originally Posted by Cdy291 View Post
if you run a blow dryer it will throw the circuit breaker after about a minute.
Hair dryer nameplate says 1875W?
Yoyizit is offline   Reply With Quote
Old 06-03-2012, 10:27 AM   #6
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Bath fan throwing breaker


The bath and bed room are on a 15amp switch. Is it possible to install a 20amp switch in its place, or would the wires fry? And burn the house down.

The whole house though is pretty pathetic. The entire outside of the house is on a 15amp switch and if you run a circular saw for very long it will through.
Cdy291 is offline   Reply With Quote
Old 06-03-2012, 10:57 AM   #7
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Default

Bath fan throwing breaker


NO! You can not replace a 15 amp breaker with a 20 amp breaker. You will burn your house down. Ask your insurance company what they think about that idea!

You need to run new larger gauge wiring to use a 20 amp breaker.

Things like this are a daily annoyance. It can make daily life a WHOLE lot more pleasant to run a few new 20 amp circuits to power hogs like the bathroom, kitchen refrigerator/counter top, where you plug in the vacuum, etc.

Might want to get an estimate from an electrician. In some cases it is easy to run a new line, especially if you have an accessible attic or basement.
Billy_Bob is offline   Reply With Quote
Old 06-03-2012, 11:31 AM   #8
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 13,848
Default

Bath fan throwing breaker


Quote:
Originally Posted by Yoyizit
Hair dryer nameplate says 1875W?
That would be almost a 16amp draw. Must be one hell of a blow dryer.
__________________
Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?
gregzoll is offline   Reply With Quote
Old 06-03-2012, 12:12 PM   #9
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Bath fan throwing breaker


I tried 2 different hair dryers and both did the same thing.
Cdy291 is offline   Reply With Quote
Old 06-03-2012, 04:09 PM   #10
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Bath fan throwing breaker


Bigger bathroom breakers = more hair dryer watts = bigger bathroom breakers
http://www.nextag.com/hair-dryer-watts/stores-html

And U.S. houses went from 60A service to 200A over how many years?

Last edited by Yoyizit; 06-03-2012 at 04:16 PM.
Yoyizit is offline   Reply With Quote
Old 06-03-2012, 04:42 PM   #11
Member
 
Join Date: Feb 2012
Location: Central Coast, Cali
Posts: 105
Default

Bath fan throwing breaker


Quote:
Originally Posted by gregzoll View Post
That would be almost a 16amp draw. Must be one hell of a blow dryer.
My girlfriend's blow dryer uses 1875W as well (on the High setting).

It's basically a hair care product and space heater all in one.
LooseSCruz is offline   Reply With Quote
Old 06-03-2012, 08:55 PM   #12
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Bath fan throwing breaker


Quote:
Originally Posted by LooseSCruz View Post
and space heater
Yes, 550 BTU/hr.


I guess you could switch the wire to your bathroom breaker to another breaker of equal size in your panel. If this breaker also trips then it's ~75% likely that your bathroom circuit ampacity really is being exceeded and the original breaker is not tripping at below rated current value.
For higher certainty try yet another breaker.

Last edited by Yoyizit; 06-03-2012 at 09:00 PM.
Yoyizit is offline   Reply With Quote
Old 06-03-2012, 10:03 PM   #13
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,252
Default

Bath fan throwing breaker


fan, hairdryer on same circuit = blown breaker need to figure out how to get new circuit to bath or dryer...
ben's plumbing is offline   Reply With Quote
Old 06-04-2012, 01:03 AM   #14
Member
 
Join Date: Oct 2010
Location: Central Indiana (USA)
Posts: 1,316
Default

Bath fan throwing breaker


Quote:
Originally Posted by Cdy291 View Post
The bath and bed room are on a 15amp switch. Is it possible to install a 20amp switch in its place, or would the wires fry? And burn the house down.

The whole house though is pretty pathetic. The entire outside of the house is on a 15amp switch and if you run a circular saw for very long it will through.
The circuit needs to be upgraded to 20a, but you'll need to use #12 wire. Can be a pretty big project. You'd have to locate the cable run from the breaker to the first point of use, replace it, then replace every cable that runs from the 1st point to others, and so on.

What's your main breaker size? 100a? Got any pics of the panel to share?
sirsparksalot is offline   Reply With Quote
Old 06-04-2012, 01:55 AM   #15
Newbie
 
Join Date: Jun 2012
Posts: 4
Default

Bath fan throwing breaker


Main switch is a 200amp.

Cdy291 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Breaker box wiring question(s) janralix Electrical 6 08-29-2010 10:13 PM
small voltage on circuit with breaker off jasonmechler Electrical 3 08-24-2009 08:52 AM
Central air unit throwing breaker joycet Electrical 4 08-20-2008 08:35 PM
20 Amp Breaker tripping with GFCI panhandlion Electrical 7 12-12-2007 08:59 PM
Outdoor breaker panel questions lhoney2 Electrical 12 07-19-2007 05:44 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.