Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-24-2009, 10:13 PM   #1
Rivet Master
 
wheel interested's Avatar
 
2007 23' International CCD
Lapeer , Michigan
Join Date: Oct 2003
Posts: 7,039
shore power plug melted

Well DH returned with a problem, the shore power plug of the AS melted into the plug of the surge protector using the heat pump presumably.

Previously on a different AS the shore power plug melted into the heavy duty RV extension using the AC at home.

Is this an issue of available current or poor connections or what? Thanks in advance.
__________________

__________________
Caroljb



photography
wheel interested is offline   Reply With Quote
Old 10-24-2009, 10:19 PM   #2
Rivet Master<br><img src="/ugala/forums/images/5rivet.gif">
 
CanoeStream's Avatar

 
2006 25' Safari FB SE
St. Cloud , Minnesota
Join Date: Aug 2003
Posts: 13,279
Images: 19
Blog Entries: 3
We've heard of this melting problem while trying to use the AC if one uses a 15 amp adapter on the male end of the 30 amp power cord. The heat pump still uses the AC compressor IIRC.

Same as the air conditioner -- ya need more available amps. The appliance (AC in this case) will try to pull the higher amperage thru an inadequate outlet & adapter.

Chuck has found a 20 amp outlet can be used if you aren't trying to run any other high-demand appliances on house current (eg, no microwave, put fridge on propane, etc) -- but most people don't even have 20 amp outlets in their home.
__________________

__________________
Bob

5 meter Langford Nahanni

CanoeStream is offline   Reply With Quote
Old 10-24-2009, 10:48 PM   #3
Rivet Master
 
Jim Foster's Avatar
 
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods , California
Join Date: Jun 2004
Posts: 1,615
Send a message via Yahoo to Jim Foster
A poor connection at the plug, or within the plug, can cause heat when a draw is applied to the circuit. If there is a big draw, the weakest part of that circuit, perhaps where cords are plugged together, can get very hot.

All electric devices contain smoke. They will quit working if you let the smoke out.
__________________
Jim Foster is offline   Reply With Quote
Old 10-24-2009, 11:42 PM   #4
Rivet Master<br><img src="/ugala/forums/images/5rivet.gif">
 
CanoeStream's Avatar

 
2006 25' Safari FB SE
St. Cloud , Minnesota
Join Date: Aug 2003
Posts: 13,279
Images: 19
Blog Entries: 3
I did a quick search. Some links within these threads are useful. Jim, there are even a couple mentions of smoke.

http://www.airforums.com/forums/f37/...ord-42108.html
http://www.airforums.com/forums/f37/...rds-43494.html

Just Jim - nobody else - http://www.airforums.com/forums/f7/s...tml#post145580
__________________
Bob

5 meter Langford Nahanni

CanoeStream is offline   Reply With Quote
Old 10-24-2009, 11:58 PM   #5
Site Team
 
Aage's Avatar
 
1974 31' Sovereign
Ottawa , ON
Join Date: May 2008
Posts: 11,204
Images: 25
I willing to bet that's it's the guage of wire used in more cases than not.

Ever notice how heavy the good ones are? That's not by accident. Skinny wire's resistance produces heat. Heat will eventually produce smoke, and in extreme cases, even fire.

Like in most things, you'll never hear anybody complain that the cables they bought were too heavy-duty.

Think of it like plumbing: you want to move a lot of water, you need a fatter pipe.
__________________
“Courage is being scared to death, but saddling up anyway.”
...John Wayne...........................
Aage is offline   Reply With Quote
Old 10-25-2009, 12:21 AM   #6
Rivet Master
 
Jim Foster's Avatar
 
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods , California
Join Date: Jun 2004
Posts: 1,615
Send a message via Yahoo to Jim Foster
Guage is very important.
When I was a Snap-On dealer we sold a set of very good jumper cables made from heavy welding cable and heavy duty clamps. Some would pass on them because of their hefty, nearly $50.00 price tag, and get the $7.95 junk from some other place.

After all, "I'm not going to use them every day, I only want them for an emergency."

Go figure.
__________________
Jim Foster is offline   Reply With Quote
Old 10-25-2009, 08:19 AM   #7
More than one rivet loose
 
thecatsandi's Avatar

 
Currently Looking...
Keymar , Maryland
Join Date: Feb 2006
Posts: 3,754
Quote:
Originally Posted by wheel interested View Post
Well DH returned with a problem, the shore power plug of the AS melted into the plug of the surge protector using the heat pump presumably.

Previously on a different AS the shore power plug melted into the heavy duty RV extension using the AC at home.

Is this an issue of available current or poor connections or what? Thanks in advance.
Carol,
Could be both. Dirty (not shinny) contact cause resistance which will raise the power (current) draw. Low voltage will raise the power (current) draw.
Too small a wire will raise power draw. Too much use will fray the wires at the end of the wire, this will cause an incrase in power draw. I had this happen and cut off the end of the trailer cable and put on a new 30A plug.
Problem solved.
I have been told by a good AS tech that if you do not twist lock and screw the collar down this can cause the receptical and plug in the AS to fuse together. An expensive fix.

Replace the cable and use 30A extension cables and a 30A outlet. I know you were doing this for you AS but with two do you have two 30A outlets on seperate circuits?
__________________
Michelle TAC MT-0
Sarah, Snowball

Looking for a 1962 Flying Cloud

thecatsandi is offline   Reply With Quote
Old 10-25-2009, 08:52 AM   #8
Rivet Master
 
1976 25' Caravanner
Vintage Kin Owner
Campton , New Hampshire
Join Date: Feb 2006
Posts: 1,113
The shore power line should be capable of running what ever is in the unit. More than likely there is a poor connection inside the shore power plug so you're not getting the full use of the heavy gage wire. Is the surge protector rated for 30a ?
__________________
ticki2 is offline   Reply With Quote
Old 10-25-2009, 09:07 AM   #9
Moderator
 
moosetags's Avatar

 
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach , Florida
Join Date: Jul 2006
Posts: 10,762
Images: 5
We had a similar problem with Lucy's 30 amp OEM shore power cord earlier this year. In May, we were camped at Quartzsite, Arizona. The daytime temperatures were spiking near 110 degrees. Lucy's air conditioner was running pretty much steadily during the day. Lucy was plugged into a 50 amp outlet using a 30 to 50 pigtail. Lucy's electric service continued to work for a couple of days. As we were braking camp, I noticed that the male end of Lucy's power cord was very hot as was the female end of the 50amp/30amo adapter. They had melted together.

I unplugged from the campground power outlet. The male end of the adapter was not warm at all. I was able to separate the pigtail adapter using a sharp knife. I was able to continue Lucy's long western trip using the same semi-melted power cord without any further problems. When we returned home two months later, I did replace the male end of Lucy's shore power cord. I have also replaced the 50 to 30 adapter.

I have assumed that the problem was with the adapter.

Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2018 Silverado 2500 (Lillian)
moosetags is offline   Reply With Quote
Old 10-25-2009, 09:37 AM   #10
Rivet Master
 
boondockdad's Avatar
 
2008 30' Classic S/O
Dearborn , Michigan
Join Date: Aug 2006
Posts: 1,295
Images: 21
Can't say for sure what caused this. A/C full blast. A/S shipped me a new one... hasn't happened since.
Attached Thumbnails
Click image for larger version

Name:	IMG_meltedPC.jpg
Views:	206
Size:	1.87 MB
ID:	89698  
__________________
boondockdad is offline   Reply With Quote
Old 10-25-2009, 10:20 AM   #11
Rivet Master
 
wheel interested's Avatar
 
2007 23' International CCD
Lapeer , Michigan
Join Date: Oct 2003
Posts: 7,039
Besides cleaning the prongs how can we make better connections?

Here is the surge guard and it's rated for 30 amp.

Click image for larger version

Name:	34730.jpg
Views:	136
Size:	25.6 KB
ID:	89697

We have one dedicated 30 amp connection run separate and directly from the main electrical box to the exterior covered garage wall plug at home and we only plug in one AS at a time.

Our extension cord is heavy duty 30 amp cord, same thickness as the shore power cord it looks like to me. We bought it from the AS factory. We have two extensions Michelle. Brad has bought a plastic covered connector box(?) and plugs the AS cord and extension cord into that, at home, since the melting eposode. It seems the plastic in between the rubber plugs makes a better seal or does not allow the rubber ends to melt together.

Brian, Brad will try his Exacto blade to separate the cords. For the time being they are still together. I may also pm you and Michelle about replacing the plug. He wants to replace the entire cord rather than mess with replacement.

All this troubleshooting is invaluable to us. I am appreciating everyone's input.

I wonder if the current going to the makeshift campsite where he seasoned was suspect, yet the Surge Guard would have kicked the electric off, I would have thought, before it would melt. How do you check the connection inside the shore power plug, or does he already know this? I am just the mediator and running between the trailer (it's a beautiful day here in Michigan) and the computer...I know he's got guages or meters.
__________________
Caroljb



photography
wheel interested is offline   Reply With Quote
Old 10-25-2009, 11:43 AM   #12
banjobill
 
wmarsha's Avatar
 
2000 30' Limited
battle ground, , Washington
Join Date: Jun 2009
Posts: 510
protected, but still warmed up

Okay, look at the electrical system in its totality for a moment. each circuit in the AS is protected by a circuit breaker-if any individual load begins to draw more than the circuit breaker's rating-it will trip. Now, looking at the coach as a whole-it should never exceed 30 amps, right? well, no. If each of the individual circuits in your AS are drawing say 10 amps each, then if you have four circuits, you actually are drawing 40 amps. Now, knowing that is possible, if your umbilical is plugged into a 30 amp breaker, either in your surge protector, or in the circuit from home or rv camp or wherever then that breaker should operate. Now, you didn't say any circuit breaker operated-meaning the current flow through this umbilical never exceeded 30 amps. So what gives? Okay there is a mechanical connection that has begun to fail. that connection is/are the spades of the plug/receptacle. Those spades have introduced a resistance into the circuit and the result (energy usage) of that resistance is heat.

Okay, what is causing the resistance? Well, the physical connecting action of the plug/receptacle is supposed to "clean" the spades when inserted. However, the female receptacle's spring action of its contacts can become weakened over time, not cleaning the male spade's surface area, causing resistance. If the female end is "loose" (no offense intended), then it, too introduces resistance. Once the joint begins to heat, it becomes a heat sink, causing more and more heat until something oxidizes (burns) causing more resistance, and hence more heat.

Cure? keep contacts (male spades) clean, lubricate the receptacle with dielectric compound, insert the male plug straight into the female receptacle with as little side-to-side motion as is possible. Once a male end is heated like the one you have-time to cut it off and wire up a new one. When purchasing a new plug or receptacle, look at the construction of the piece-check out the "robustness" of the copper contacts-compare less expensive ones to more expensive ones-size does matter, here. a larger surface area (within the specifications of the plug/receptacle design) is better. Twist locks are probably better because of the physical twisting action of the contact connection. Plugs with the handle at the back may be better because they allow for straight pull apart action (no side-to-side). Once again, lubricate with dielectric compound.
__________________
wmarsha is offline   Reply With Quote
Old 10-25-2009, 11:50 AM   #13
Rivet Master
 
1976 25' Caravanner
Vintage Kin Owner
Campton , New Hampshire
Join Date: Feb 2006
Posts: 1,113
The shore power plug in the picture looks to be molded whi ch means it cannot be checked . It can be cut off and a replacement put on , any RV dealer has them. With a bad connection at the plug I would think there would be a voltage drop between the house and trailer.
__________________
ticki2 is offline   Reply With Quote
Old 10-25-2009, 12:14 PM   #14
Rivet Master
 
AirsDream's Avatar
 
1999 23' Safari
Perrysburg , Ann Arbor
Join Date: Sep 2005
Posts: 914
My A/S came with a somewhat-melted plug. It "appeared" that there was a high current-draw event of some sort that caused this (probably a poor internal connection, but it too was a molded plug that could not be checked) ... I cut it off and replaced it the week I got it, making sure all wires had a good connection. No problems since.

Glad you got your DH back!
__________________

__________________
AirsDream is offline   Reply With Quote
Reply


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
Power surging from shore power in my Excella 500? NVDeputy Lights - Interior & Exterior 4 10-09-2009 12:52 PM
Accessing Shore Power Plug on '06 Safari Denis4x4 Batteries, Univolts, Converters & Inverters 5 03-09-2009 01:33 PM
Shore Power Again The Flintstones Batteries, Univolts, Converters & Inverters 13 10-09-2007 08:18 PM
Shore power and battery power problems jfremstad Electrical - Systems, Generators, Batteries & Solar 5 05-03-2007 09:23 AM
Shore power cord FreshAir Electrical - Systems, Generators, Batteries & Solar 18 02-21-2007 03:41 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:23 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.