Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-26-2018, 05:49 AM   #1
Senior Member
 
City: Oriental
Country: USA
Vessel Name: Meridian
Vessel Model: Albin 36 Trawler
Join Date: Aug 2014
Posts: 188
Burn cord

What could have caused this burn ? What should I look for or how to prevent this from happening again . Thank you
Attached Thumbnails
Click image for larger version

Name:	C8F27C7B-4018-4100-B5AA-C889101E05D8.jpg
Views:	139
Size:	56.0 KB
ID:	75573  
__________________
Advertisement

KEVMAR is offline   Reply With Quote
Old 04-26-2018, 06:00 AM   #2
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 5,978
Electricity.

Probably corrosion on the terminal making poor contact. If that was the boat end, replace the receptacle also. While the cord is rated for 30 amps, running close to the limit constantly increases the risk of this due to the contact size. Always make sure to turn the plug all the way for optimal contact before tightening the locking ring.

Ted
__________________

__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 04-26-2018, 06:07 AM   #3
Senior Member
 
Maerin's Avatar
 
City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 441
Quote:
Originally Posted by KEVMAR View Post
What could have caused this burn ? What should I look for or how to prevent this from happening again . Thank you


A poor connection caused the burn. Arcing of the contacts due to age & misalignment of mating contacts. It's a poor design that is unfortunately in common use in 30A marine cords. A permanent solution is a "smart plug" that requires both plug & receptacle change. Or, change the plug to a new one of the same type. The mating connection is likely also damaged, it should also be critically inspected perhaps replaced. Keep cord ends out of the water, check for arcing/smell, spray contacts with T-9 or other to keep contacts corrosion free.
__________________
Steve Sipe
Selene 4303 Maerin
http://maerin.net
Maerin is offline   Reply With Quote
Old 04-26-2018, 06:23 AM   #4
Senior Member
 
boathealer's Avatar
 
City: North Carolina
Country: US
Vessel Name: SCOUT
Vessel Model: Great Harbour N37
Join Date: Aug 2017
Posts: 388
Quote:
Originally Posted by KEVMAR View Post
What could have caused this burn ? What should I look for or how to prevent this from happening again . Thank you
  1. Corroded contacts = resistance.
  2. High current + resistance = heat.
  3. Heat + time = FIRE!!!

Replace the cord (and the receptacle if the contacts are suspect).
Use dielectric grease on all contacts 2-3 times per year ($1.69 at Wal-mart auto section).
boathealer is offline   Reply With Quote
Old 04-26-2018, 06:56 AM   #5
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,297
Do you have two 30A shore power inlets?
If so, was this the cord that powers the air con?
__________________
Archie
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ
High Wire is offline   Reply With Quote
Old 04-26-2018, 06:58 AM   #6
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 17,832
The most common cause seems to be dropping the plug into the water.

The wires inside the cover never dry properly and the resistance goes up.

Overloading will also cause a burnout as many CB have a time tolerance for over their rated current .

Purchasing a wire end that can be disassembled , and cleaned should help.

I prefer Hubbel , which seems to last longer than the cheapos.

https://www.fisheriessupply.com/hubb...plug-hbl26cm11
FF is offline   Reply With Quote
Old 04-26-2018, 07:16 AM   #7
Senior Member
 
Ex Sailor's Avatar
 
City: Toronto
Country: Canada
Vessel Model: Kha Shing 40
Join Date: Nov 2015
Posts: 249
Quote:
Originally Posted by KEVMAR View Post
What could have caused this burn ? What should I look for or how to prevent this from happening again . Thank you
May have been flawed (?) to start with, but I agree that it should be turned ALL THE WAY to lock it in place before the collar is turned. Looking at the photo, I think it's unlikely that the boat end is the problem ...... fb
Ex Sailor is offline   Reply With Quote
Old 04-26-2018, 07:25 AM   #8
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Vancouver Shipyards Custom Aluminum 52
Join Date: Sep 2013
Posts: 2,922
What do you have plugged in? With 30 amps you are allowed 3600 watts (if you have 120 volts available). A cabin heater? Battery charger? Hot water tank? Lighting? Fans? Did you use a microwave? Toaster?

You need to total your load. The best way to discover if you are overloading is to use a meter and measure the power in the boat - if it is LESS than the unloaded power on the dock, ie if you are getting 100 volts on the boat, there is a serious risk of an electrical fire and at best, damage like you have just shown us.
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 04-26-2018, 07:36 AM   #9
Guru
 
siestakey's Avatar
 
City: Sarasota,FL/Thomasville,GA
Country: USA
Vessel Name: Steppin Stone IV
Vessel Model: Marine Trader Kelly Trawler 46
Join Date: Jul 2013
Posts: 1,800
Send a message via Skype™ to siestakey
Quote:
Originally Posted by boathealer View Post
  1. Corroded contacts = resistance.
  2. High current + resistance = heat.
  3. Heat + time = FIRE!!!

Replace the cord (and the receptacle if the contacts are suspect).
Use dielectric grease on all contacts 2-3 times per year ($1.69 at Wal-mart auto section).
BoatHealer is right this happened to me and many others on our dock in years past now any time I remove my cord I use Dieelctric grease from advanced auto ( but looks like the walmart one is cheaper) the brand I use is Permatex. Also when you put it on put on both contacts with breaker off and put the cord on and off several times. First your going to need to replace the end of that cord I would also have the marina replace the receptacle.
__________________
Alan
Skype roatan63
siestakey is offline   Reply With Quote
Old 04-26-2018, 07:37 AM   #10
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 6,684
Quote:
Originally Posted by Maerin View Post
... spray contacts with T-9 or other to keep contacts corrosion free.
We use a contact cleaner made by CRC. When were tied to the dock, once a month we spray both ends of the power cords and the female connecter at the pedestal. I've used it on boat electronics and hand held devices that I thought might be dead and it turns out its just a poor or dirty electrical contact.
Attached Thumbnails
Click image for larger version

Name:	140E8E99-A4CC-4E47-955B-C21EDA387483.jpg
Views:	86
Size:	182.2 KB
ID:	75577  
Larry M is offline   Reply With Quote
Old 04-26-2018, 07:43 AM   #11
Guru
 
City: Fairport
Country: United States
Join Date: Jan 2017
Posts: 1,098
Quote:
Originally Posted by Maerin View Post
A poor connection caused the burn. Arcing of the contacts due to age & misalignment of mating contacts. It's a poor design that is unfortunately in common use in 30A marine cords. A permanent solution is a "smart plug" that requires both plug & receptacle change. Or, change the plug to a new one of the same type. The mating connection is likely also damaged, it should also be critically inspected perhaps replaced. Keep cord ends out of the water, check for arcing/smell, spray contacts with T-9 or other to keep contacts corrosion free.
I agree with this. The NEMA L series is a horrible design for durability in wet environments with either motion or frequent attach cycles. OK for inside factories, where they see good service.
diver dave is offline   Reply With Quote
Old 04-26-2018, 07:53 AM   #12
Guru
 
siestakey's Avatar
 
City: Sarasota,FL/Thomasville,GA
Country: USA
Vessel Name: Steppin Stone IV
Vessel Model: Marine Trader Kelly Trawler 46
Join Date: Jul 2013
Posts: 1,800
Send a message via Skype™ to siestakey
Quote:
Originally Posted by Larry M View Post
We use a contact cleaner made by CRC. When were tied to the dock, once a month we spray both ends of the power cords and the female connecter at the pedestal. I've used it on boat electronics and hand held devices that I thought might be dead and it turns out its just a poor or dirty electrical contact.
Great stuff I keep one of these at home and on the boat ( keep it in ziplock bag) using this in addition to the grease is a great plan
__________________
Alan
Skype roatan63
siestakey is offline   Reply With Quote
Old 04-26-2018, 09:50 AM   #13
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,490
All of the above but the usual start of the process is is dropping in the water.
bayview is offline   Reply With Quote
Old 04-26-2018, 10:09 AM   #14
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 11,193
CorrosionX is another good product for the purpose. I use it on my connections after having a similar problem.

I also had to replace my boat receptacle since it was marred also. Now everytime I arrive at my boat in the slip, I touch the cord (both ends) to check for heat. No problems since I started using CorrosionX.
FlyWright is offline   Reply With Quote
Old 04-26-2018, 11:47 AM   #15
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 2,376
+1 on the Smart plug. It has much more contact area to carry the current. I replaced both of my 30 amp inlets with the Smart plug.
Comodave is offline   Reply With Quote
Old 04-26-2018, 11:49 AM   #16
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,900
The most important thing here is that you replace it. I call that "boat herpes". Because guess what???? That will cause heat on whatever it is plugged into. And it will spread that burn to whatever it is plugged into. And from then on it will keep spreading. If you have 2 30 amp cords and you keep interchanging them...it will spread to all cords and all onboard receptacles. Get it changed...NOW!!!
__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
Baker is offline   Reply With Quote
Old 04-26-2018, 12:12 PM   #17
TF Site Team
 
Bacchus's Avatar
 
City: Seneca Lake NY
Country: US
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 1,864
Agree w other answers and would add you should always connect / disconnect w no load by turning off breakers. If done under load the arcing will start the same process as corrosion.
This is a very common occurance w 30A cords.
These only make point contact and don't have a contact area like most recepticle / plugs do.
Do replace the inlet and cord plugs.

Smart plug design is much better IMO.
For a good summary take a look at

https://marinehowto.com/shore-power-...tplug-vs-1938/
CM is a great resource for us boaters.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
Bacchus is offline   Reply With Quote
Old 04-26-2018, 12:56 PM   #18
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,297
Normally the burned contact is the physically smallest contact (the white/neutral/silver) but in this case it is the hot contact.
Loose wire connection on the black/hot/brass colored connector on either the plug end or the socket end. Replace BOTH since both will be permanently damaged.
__________________
Archie
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ
High Wire is offline   Reply With Quote
Old 04-26-2018, 01:44 PM   #19
Senior Member
 
City: Oriental
Country: USA
Vessel Name: Meridian
Vessel Model: Albin 36 Trawler
Join Date: Aug 2014
Posts: 188
thank you all for the suggestions I am replacing the cord and receptacle.
KEVMAR is offline   Reply With Quote
Old 04-26-2018, 01:49 PM   #20
Senior Member
 
City: Oriental
Country: USA
Vessel Name: Meridian
Vessel Model: Albin 36 Trawler
Join Date: Aug 2014
Posts: 188
any suggestions on how to fix the power cord?
__________________

KEVMAR 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





All times are GMT -5. The time now is 02:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012