HELP! TT not grounded or is there a short? - Page 3 - Fiberglass RV

Thread Tools Search this Thread Display Modes
Old 10-09-2007, 05:51 PM   #29
Senior Member
Pete Dumbleton's Avatar
Trailer: Scamp
Posts: 3,072
Send a message via Yahoo to Pete Dumbleton
I missed the a/c part. Campers wired for a/c typically have a complete 30A@120VAC package installed consisting of a heavy shore power cable with a 30A@120VAC plug and a set of 15A@120VAC circuit breakers in a box or the converter.

One of the breakers will be dedicated to nothing but the a/c (and its heat strips, if any) and the other breaker will be for all the rest of the appliances, converter and outlets.

If someone has a 15A@120VAC plug on the shore power cable and also has a/c installed, they have a jack-leg, non-Code setup and should consult a knowledgeable electrician.

Not sure I agree with the 'different prongs at different times' explanation for a GFCI tripping. The way it works is that the GFCI is balanced and more current on one power leg than on the neutral leg implies current flowing elsewhere and the unbalance opens the circuit. If one prong is touching and the other isn't, there's no current flow unless there is leakage to ground...

WiKi on GFCI


1. I don't believe all GFCIs will detect a missing ground, just an imbalance, however it's likely the test button wouldn't work.

2. I don't believe all GFCI will detect reversed power and neutral, again it needs an imbalance to trip. There are different types of GFCI, some may detect the power wire, some may not.

3. I suspect any GFCI breaker that is doing strange stuf is either strange itself or is a strange situation...

4. Contrary to popular understanding, not all GFCIs protect outlets 'downstream' from them. I have personally handled a GFCI receptacle which had wiring options to protect or NOT protect the downstream outlets.

Pete Dumbleton is offline   Reply With Quote
Old 02-17-2010, 10:00 PM   #30
Senior Member
V'sGlassSleeper's Avatar
Name: Val
Trailer: 1988 Bigfoot Deluxe B19 19 ft / 2007 Nissan Frontier V6 NISMO 4x4
Posts: 297

This turned out to be the exterior outlets we were using at home; we live in a 1940's era bungalow which has required significant "updating" over the years -- both outlets had reversed polarity and were not actually grounded (though they were "three prong"). Got the wiring corrected and then everything worked great.

Lesson learned: Sometimes the answer is the simplest one.

V'sGlassSleeper is offline   Reply With Quote
Old 02-19-2010, 05:47 PM   #31
Senior Member
Joe MacDonald's Avatar
Trailer: Trillium
Posts: 712
Most GFCI's sold in Canada detect incorrect polarity, if it's wrong the outlet won't work., or will not reset.

Downstream protection generally depends on how you wire the GFCI.

In Ontario, the acceptable fix from ESA(our hydro authority) for situations in older houses that do not have a ground conductor in the 110v cable is to either pull a separate ground wire from a city water point, (highly impractical in a finished house) or install a GFCI and let it deal with the ground fault issues on it's own.

Glad you got your troubles sorted out

Joe MacDonald is offline   Reply With Quote
Old 02-24-2010, 02:33 PM   #32
Senior Member
Steve Outlaw's Avatar
Trailer: Oliver Legacy Elite II
Posts: 468
Lesson learned: Sometimes the answer is the simplest one.

[b]A perfect example of Occam's razor.

Steve and Tali - Dogs: Reacher and Lucy and our beloved Storm and Maggie (waiting at the Rainbow Bridge)
2008 Outlaw Oliver Legacy Elite & 2014 Outlaw Oliver Legacy Elite II
2014 GMC Sierra 6.2L Max Tow Pkg 4X4 Crew Cab
Steve Outlaw is offline   Reply With Quote

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 Short? JenPB Problem Solving | Owners Helping Owners 9 01-18-2010 04:54 PM
A short boler bio Perry Mac Donald General Chat 9 01-11-2010 07:35 PM
A short in my Scamp? Doris Problem Solving | Owners Helping Owners 1 06-22-2008 11:46 AM
Still grounded, but chomping at the bit jimmyg General Chat 10 05-26-2006 11:54 PM
electric short Legacy Posts Problem Solving | Owners Helping Owners 1 11-18-2002 01:26 PM

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

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:36 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.