Electrical Wimpet Wonders Why? Breaker Trip? - Page 2 - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-15-2013, 09:19 PM   #15
Senior Member
 
Name: Russ
Trailer: Scamp 16' side dinette, Airstream Safari 19'
California
Posts: 588
Quote:
Originally Posted by cpaharley2008 View Post
10 amps is the max for a 12 ga extension cord, what is your heater drawing?
Jim,
Shouldn't 12 ga. do 20 amps?
Russ
__________________

__________________
ruscal is offline   Reply With Quote
Old 10-15-2013, 09:23 PM   #16
Senior Member
 
Name: bob
Trailer: 1984 u-haul ct13; 1996 Casita 17 Spirit Deluxe; 1946 Modernistic teardrop
New York
Posts: 4,333
The Uhaul breaker is not adequate to power a small electric heater. I found that out early on. First solution was to install a small fuse box separate from the rest of the system, namely the original power converter, and a couple 110 outlets off that fuse box. Since then I have scrapped the original power converter, installed a new one, and completely rewired the 110 & 12 volt circuits. We now can run a 1500 W heater, TV, lights, toaster, dorm fridge. For the size of the Uhaul cord, heavy duty, the original outlet with breaker is ridiculous. Diane, you would have been better off to get the extension cord from the campground electric box into the trailer somehow and plugged your heater directly to that, relying on their breaker. One time I ran a cord under the door to get power inside.
__________________

__________________
mary and bob is offline   Reply With Quote
Old 10-16-2013, 08:01 AM   #17
Senior Member
 
cpaharley2008's Avatar
 
Name: jim
Trailer: 2016 2ndGen Escape19 Prairie Schooner pulled by 2014 Dodge Ram Hemi Sport
Pennsylvania
Posts: 6,398
Registry
Quote:
Originally Posted by ruscal View Post
Jim,
Shouldn't 12 ga. do 20 amps?
Russ
it should but with a 100 foot cord it may not!
__________________
Jim
Never in doubt, often wrong
cpaharley2008 is offline   Reply With Quote
Old 10-16-2013, 08:18 AM   #18
Senior Member
 
D Davis's Avatar
 
Name: Diane
Trailer: u-haul ct13
Virginia
Posts: 1,000
Have all new wires 110 and 12 volt, fuses and New PD 3 stage converter. Heater is packed away. Got to go to work, will retest everything and get back to you guys later. Thanks all.
__________________
D Davis is offline   Reply With Quote
Old 10-16-2013, 08:52 AM   #19
Senior Member
 
Jon Vermilye's Avatar
 
Name: Jon
Trailer: 2017 Escape 21
Oswego, NY
Posts: 1,408
Registry
Just a small point - the lower the voltage feeding the heater, the less current it draws. Unlike an air conditioner, a heater is a pure resistance load and follows Ohm's law - I=E/R. If the power cord drops too much voltage because of length or wire size there is less likelihood of the breaker tripping. That said, overloaded cords are still bad since the heating, particularly at the connectors, will cause problems. I'd suspect either high voltage at the campground, or a worn breaker.
Jon Vermilye is offline   Reply With Quote
Old 10-16-2013, 09:29 AM   #20
Senior Member
 
Bob Miller's Avatar
 
Name: Bob
Trailer: 1973 Hunter Compact II
California
Posts: 7,912
What "I" would do at this point:

1. Get a polarity tester and check your inside outlets as well as those you connect to at home & elsewhere. Also check any adapters to be sure they are wired correctly when used.
2. Replace the existing 15 amp breaker(s) with NEW 15 amp breakers, after all, it (they) are OLD.
3. Have a long enough #10 main cable to reduce the chance you will need to use an extension cord.
4. After you have everything hooked up and working for about an hour (including that heater), check all plugs for any signs of heating up. If they are more than just very slightly warm they may also need replacement. FWIW: Molded-on plugs, both on your power cord and adapters, have a limited life expectancy.

And that's JMHO.....
__________________
Bob Miller is offline   Reply With Quote
Old 10-16-2013, 09:55 AM   #21
Senior Member
 
Name: None
Trailer: None
None
Posts: 2,738
Cord ampacity

Quote:
Originally Posted by ruscal View Post
Jim,
Shouldn't 12 ga. do 20 amps?
Russ
The ampacity for cords is listed in Art 400 of the NEC not in Art 310-16 ,which lists the ampacity of standard building wire . According to the NEC 12/3 standard cord @ listed ambient temperature has an ampacity of 20 amps .. Length of the cord and voltage drop are also issues to be considered . Using an extension cord at 100 % of ampacity usually destroys the male and female cord ends long before damaging the cord itself
__________________
steve dunham is offline   Reply With Quote
Old 10-16-2013, 10:27 AM   #22
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,317
Registry
If Diane was running an air conditioner, I would suspect low supply voltage. Motors will draw more current under low voltage conditions. But just a heater? To me, the only possible suspect becomes the camp ground supplying too high of a voltage. Especially if the heater runs fine at home.
__________________
David Tilston is offline   Reply With Quote
Old 10-16-2013, 10:50 AM   #23
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Question for the electrical guru's.

Lets say for a moment that the trailer in question has been all rewired & has new 15 amp breakers etc and the owner had checked the issue wasnt with the campground power supply, could the problem simple be the use of an extension cord with the trailers main power 15 amp supply cord? I dont now enough about how a 15 amp trailer is normally set up (but in this case it sounds like the OP has a newer converter, so would have thought it to be the same as a 30 amp system) but I do know that most small electrical heaters have instructions indicating that they should not be used with an extension cord. If the converter is in place what happens that an appliance such as a heater would it even know there was an extension cord (with the correct amps for the heater) attached to the trailers main supply (assuming its not a real long one) & if no other power hungry appliances where in use? Would having a longer main trailer power supply cord, avoiding the use of the need for an extension cord change anything?
Enquiring minds want to know.
Carol H is offline   Reply With Quote
Old 10-16-2013, 11:01 AM   #24
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,317
Registry
I suspect that the reason that they don't want you to run on an extension cord is that a heater draws lots of power. If the cord is damaged, the heater could cause it to fail. Otherwise it is a resister in series with a load. The power cord could cause a voltage drop, but that is it. It would not cause additional current to flow to a heater. In fact exactly the opposite, less current.

A 30A service would just have a larger wire in the cord, therefor less resistance, less voltage drop. A 12/3 extension cord is all that a 15A trailer supply would require, but a 1500 W heater would be taking most of that capacity. 1500W/120VAC=12.5A
__________________
David Tilston is offline   Reply With Quote
Old 10-16-2013, 11:21 AM   #25
Senior Member
 
Bob Miller's Avatar
 
Name: Bob
Trailer: 1973 Hunter Compact II
California
Posts: 7,912
In acting as a resistor the 10 amp power cord could also overheat, melt insulation, short out, start a fire, you name it.

As far as the original U-Haul breaker not supporting a heater... It shouldn't be a problem
A typical small space heater is 800-1500 watts max, that's less than 15 amps in all cases and more like 10 in most.

A good 15 amp breaker should have no problems with that load, unless, as mentioned, it's original and well worn, as all original one are by now.
__________________
Bob Miller is offline   Reply With Quote
Old 10-16-2013, 11:52 AM   #26
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,317
Registry
I should have mentioned that not all power cords can support 15A A 12/3 will, but an 18/3 will not. Extended use of an 18/3 cord with a 1500W heater, could lead to a fire.
__________________
David Tilston is offline   Reply With Quote
Old 10-16-2013, 12:16 PM   #27
Senior Member
 
floyd's Avatar
 
Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
IllAnnoy
Posts: 6,051
Registry
Quote:
Originally Posted by cpaharley2008 View Post
it should but with a 100 foot cord it may not!
It's AC! It's 20A
__________________
floyd is offline   Reply With Quote
Old 10-16-2013, 03:12 PM   #28
Senior Member
 
D Davis's Avatar
 
Name: Diane
Trailer: u-haul ct13
Virginia
Posts: 1,000
Okay guys, I bought the little GFCI tester, read the instructions. Man I have a lot of ungrounded receptacles in my home! Found a wired right one in the home and connected the Camper cable to it. Tested the main GFCI located at the end of the upper cabinet. It tested as being wired Okay. Then as Bob said, connected the heater...it blew the breaker in camper in 30 minutes. The heater is a 120 V 1500 watt 12.5 Ag label on the back. I did not use any extension cord. So DO YOU THINK I NEED TO REPLACE THE BREAKER AND GFCI RECEPTACLE which appears to be the original to the CT13? ALL other wiring including 12V is new.Thanks guys each and everyone of you! Have tester will travel! LOL Thanks
__________________

__________________
D Davis is offline   Reply With Quote
Reply

Tags
electrical


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Electrical Breaker Problems Debbie Ray Problem Solving | Owners Helping Owners 6 07-09-2014 06:30 PM
Wonders near home Perry J General Chat 16 11-02-2011 04:02 PM
breaker works too well Paula Bindrich Problem Solving | Owners Helping Owners 13 07-06-2007 11:48 AM
Seven wonders of Canada CharlynnT General Chat 14 04-29-2007 09:52 PM
Where does the circuit breaker go? Legacy Posts Problem Solving | Owners Helping Owners 7 07-17-2003 09:47 PM

» Trailer Showcase

Buttercup

Ian G.

UHaul

Calud13
» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:13 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.