Reply
 
Thread Tools Display Modes
 
Old 04-27-2011, 08:13 PM   #1
Bus Nut
 
Join Date: Feb 2008
Posts: 362
Send a message via AIM to baadpuppy Send a message via MSN to baadpuppy Send a message via Yahoo to baadpuppy
Information on GFI

Found this link on another forum. Someone took the time to document how GFIs work, and make it available to the public in a fairly easy to understand form. It then goes on to mention the common things in an RV that could cause a GFI to trip.

http://personal.cha.bellsouth.net/j/...les/rv/gfi.pdf

hope this is helpful,
jim
baadpuppy is offline   Reply With Quote
Old 04-27-2011, 09:40 PM   #2
Bus Crazy
 
Join Date: Jan 2008
Location: Upstate NY (Mohawk Valley)
Posts: 1,096
Re: Information on GFI

Good article, trying to be clear, but unavoidably a bit geeky. A layman's eyes might be glazed over by the middle of the article. That is a shame, because they might stop reading before the author gets to the part about causes of false trips. That section is important for troubleshooting, even if the "engineerical" details of how the devices operate are too much.

One source of false trips not listed that I have experience with, and the author might not, is strong radio signals. Using a walkie-talkie in an RV with GFCIs is a reliable cause of false trips. The AC wiring acts as antennas, and if enough signal is gathered and sent to the circuit board, it reacts and cuts the power the same as it would for sensing a current leak.
__________________
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.
Redbear is offline   Reply With Quote
Old 04-28-2011, 07:29 AM   #3
Bus Crazy
 
Join Date: Jan 2008
Location: Upstate NY (Mohawk Valley)
Posts: 1,096
Re: Information on GFI

Quote:
Originally Posted by Tesla
So do you agree with Mr. DeArmond of that a GFCI for the main panel is not a good idea?
To be clear, if I read him correctly, he was talking about no GFCI on the campground pedestal/building outlet that feeds the shoreline to the bus. His solution for certain "leaky" but serviceable devices was to isolate them on non-GFCI circuits. That is impossible if the entire shoreline is protected by a sensitive GFCI. His solution implies protecting individual "branch" circuits, not the entire vehicle.
__________________
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.
Redbear is offline   Reply With Quote
Old 04-28-2011, 09:42 AM   #4
Bus Nut
 
Join Date: Feb 2008
Posts: 362
Send a message via AIM to baadpuppy Send a message via MSN to baadpuppy Send a message via Yahoo to baadpuppy
Re: Information on GFI

I'm personally of the opinion that everything *should* be GFI protected if there is any chance that a human might come into contact with any potentially conductive surface on that item. How's that for a caveat?

Short version: everything.

The reason electric heating elements leak to ground is due to 50+ year old heating element design. They *can* design heating elements that don't leak any current at all.

The point about rooftop a/c units getting "crud" in their motor windings is yet another argument against using those abominations.

Proper engineering by equipment manufacturers will avoid current leakage. If your equipment doesn't leak current, it runs safer.

I recently hooked up an RV fridge (absorption type), and had to run it off the electric element. The heating element was leaking so bad it would light you up if you touched it. I had to scare up a non-GFI outlet and make sure the ground was attached to make it safe enough to test and sell. I informed the buyer they needed to replace that heating element soon. Dad an I measured 80+ volts between the fridge's frame and reference ground. That's one helluva leak.

If equipment doesn't leak when installed, then starts leaking later, a GFCI tripping will clue you into the problem. This is a Good Thing. This gives you an opportunity to fix the problem before it becomes dangerous to your health and safety.

Now, about a single GFI main breaker vs multiple GFIs... with a single main, when it trips everything is taken out. With multiples, only one circuit should be affected.

Anyway, this is just my opinion...
jim
baadpuppy is offline   Reply With Quote
Reply

Thread Tools
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
Does anyone have information on this bus? somjuan Conversion General Discussions 2 02-11-2012 03:41 PM
Bus Newbie, looking for information Diesel Dan Conversion General Discussions 3 02-12-2011 02:46 PM
Information about the Cat 3208 frank-id Caterpillar Drivetrain 4 07-17-2010 11:21 AM
A/C information busone Conversion General Discussions 1 06-03-2005 01:52 PM
Need help with Diesel information and towing information phillip266 Everything Else | General Skoolie Discussions 3 12-20-2004 08:33 AM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:27 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.