Reverse polarity - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
 Not a Member? 
  #1  
Old 11-29-2007
telekitr's Avatar
Member
 
Join Date: Oct 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
telekitr is on a distinguished road
Reverse polarity

We currently have our Passport 40 on the hard in the back of the shop awaiting her final winter cover. My issue is that I have plugged her in to building AC 120 via an adaptor and yellow shore power cord. The first few times that I went aboard to turn on the systems, all worked well. Of late, I am getting the "Reverse Polarity" light coming on and no systems are working. Does anyone know what might be causing this sporatic RP warning? Nothing has changed in the outlet in the shop....must be something along the line...but what?? Thanks in advance for your reply's.
Reply With Quote Share with Facebook
  #2  
Old 11-29-2007
trantor12020's Avatar
Senior Member
 
Join Date: Mar 2006
Location: Singapore
Posts: 622
Thanks: 0
Thanked 10 Times in 10 Posts
Rep Power: 9
trantor12020 is on a distinguished road
check your shorepower cables plugs for loose terminations.
Reply With Quote Share with Facebook
  #3  
Old 11-29-2007
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,060
Thanks: 0
Thanked 50 Times in 49 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
The "reverse polarity" light on WHAT?

There have been some discussions about RP lights on chargers and inverters coming on (and some systems will shut themselves down) because there are different schemes for grounding the AC side of systems. You might be able to turn up some of the older threads on that. My vague memory is that some equipment wants to see a real third wire ground, while some tries to use the neutral wire, and in the process, things can get into conflict between the equipment.
Reply With Quote Share with Facebook
  #4  
Old 11-29-2007
chuckjohansen's Avatar
chuckjohansen
 
Join Date: Aug 2007
Location: Near Binghamton, NY
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
chuckjohansen is on a distinguished road
You may also want to check the AC pannel for loose wires. Check the grounding lugs on the pannel. Interesting, let us know what you find.

Chuck J.
Reply With Quote Share with Facebook
  #5  
Old 11-29-2007
telekitr's Avatar
Member
 
Join Date: Oct 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
telekitr is on a distinguished road
Good suggestions

thanks guys for your suggestions. The RP light is the one on the AC panel itself. I will check for loose connections as suggested. Right now however, it looks like we are going to have a whopper of a winter storm here in New England late this weekend so I'll not likely get the opportunity to check things until next week. Have to get the cover on now.....thanks again.
Reply With Quote Share with Facebook
  #6  
Old 11-29-2007
jerryrlitton's Avatar
Oathkeepers member
 
Join Date: Oct 2002
Location: Andaman Sea
Posts: 1,208
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 12
jerryrlitton will become famous soon enough
Send a message via ICQ to jerryrlitton Send a message via MSN to jerryrlitton Send a message via Yahoo to jerryrlitton Send a message via Skype™ to jerryrlitton
Hmm

All I know is Jordi (The new Star Trek) uses it on everything from tractor beams to fixing the toilet on the Enterprise. It very seldom works.
__________________
If you always put limit on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you must go beyond them.

Bruce Lee



LET'S GET SERIOUS ABOUT ENFORCING OUR PRESENT LAWS NOW






To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 11-30-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 8 Times in 8 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
RP can also be caused by another boat on the same AC line having a faulty setup. That is most likely the case here, since you said it was previously fine. One of the boats or pieces of equipment that has been added recently to the line is causing the RP fault.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #8  
Old 11-30-2007
Senior Member
 
Join Date: Aug 2007
Posts: 306
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
thekeip is on a distinguished road
'Normal' polarity is that condition in which AC voltage is measured between the 'hot' (black) conductor and neutral (white) conductor. You should be able to measure that same voltage between hot and ground too, if all is well...that is, if the neutral and ground are connected together AT THE DOCK, NOT THE BOAT. A little Neon indicator will glow if connected between the hot and ground.
On the other hand, it may be that the black conductor and the white are swapped somewhere down the line. You'll still be able to measure the AC between the hot and neutral as before, only this time the indicator will glow if connected across the neutral and ground...that's what the RP indicator does.
'Older' boats and marinas rarely exhibit reverse polarity...that's because if the condition ever existed at all, it most likely has been corrected.
Howard Keiper
Sea Quest
Berkeley
Reply With Quote Share with Facebook
  #9  
Old 11-30-2007
Senior Member
 
Join Date: Jun 2007
Posts: 2,710
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
SEMIJim will become famous soon enough SEMIJim will become famous soon enough
Everybody that owns something that's got 125VAC distribution (home, sufficiently large boat, etc.) should have one of these: Ground Fault Indicator Tester. (Tho mine doesn't have the button for testing GFCIs.) It'll tell you if hot, neutral and ground are all present and connected to the right points. The one referenced, with the GFCI test button, will test the GFCI circuit, independently of the GFCI's own, built-in tester, as well.

When I bought our house I checked every outlet in the place. Good thing I did, too, being as, for example, the outdoor outlet (had to be that one, of all of 'em, eh?) had ground and neutral reversed. That was an electrocution waiting to happen. (It's got a GFCI outlet there, now.)

Jim
Reply With Quote Share with Facebook
  #10  
Old 11-30-2007
telekitr's Avatar
Member
 
Join Date: Oct 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
telekitr is on a distinguished road
Quote:
Originally Posted by sailingdog View Post
RP can also be caused by another boat on the same AC line having a faulty setup. That is most likely the case here, since you said it was previously fine. One of the boats or pieces of equipment that has been added recently to the line is causing the RP fault.
SD.....mine is the only boat that is connected on this outlet. The shore power cord comes out of the cockpit recepitcal and down inside the garage of my shop and plugs into a short adaptor which allows me to plug it into a normal AC outlet.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shorepower and Reverse Polarity oft Gear & Maintenance 20 12-03-2007 09:46 PM
1999 Catalina 380 - Engine stalling in reverse ibossenger Gear & Maintenance 5 11-17-2007 03:24 PM
Atomic 4 No reverse jibsheet38 Atomic 4 1 11-22-2006 06:10 PM
Shaft Vibration in Forward but not reverse bstrebe Gear & Maintenance 6 10-28-2003 07:17 AM
reverse polarity newport33 Gear & Maintenance 1 08-18-2001 06:32 PM


All times are GMT -4. The time now is 03:53 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012