Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 26-05-2010, 14:35   #1
Registered User

Join Date: Jan 2010
Location: Spain
Boat: 45' Asphalt Cruiser
Posts: 16
50amp - 120vac on Neutral

We have finally installed our Victron Autotransformer 32-amp (240v) to connect a USA 50-amp when in Europe.

Our tests directly after the stepdown transformer shows:
Leg1 + Neutral = 120v
Leg2 + Neutral = 120v
Leg1 + Leg2 = 240v
Neutral + Ground = 120v (normal USA shore should show 0v)

The 120v on the Neutral concern us since this would be an open neutral situation on stateside shore power. We have been told this may be normal with the Victron since it produces it's own floating neutral. We have also been told to ignore the reverse polarity light on our onboard status display.

Any reassurance or contrary knowledge concerning a floating neutral produced by the Victron?
__________________

__________________
Ultimarv is offline   Reply With Quote
Old 26-05-2010, 15:03   #2
S&S
Registered User
 
S&S's Avatar

Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
Images: 6
120V to ground is still 120V. I'd bond it to ground. A floating neutral will kill you just like a hot would.
__________________

__________________
S&S is offline   Reply With Quote
Old 26-05-2010, 15:16   #3
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Get in touch with Victron support and get the answer from them.
__________________
DeepFrz is offline   Reply With Quote
Old 26-05-2010, 15:20   #4
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
I discovered that on a Charles Industries isolation transformer on my Mainship 34T that the ships ground was open. Looking inside the tranformer I saw that the ships ground was terminated to a case connector but the case connector was never connected to neutral.

The NEC and maybe ABYC require that the ground and neutral be tied together at one point- the source, in this case the secondary of the tranformer. I talked to Charles and they said that they never deliver the transformer with the neutral/ground tied; it is up to the installer. In this case Mainship didn't do it. I tied the neutral and ground together and my open ground problem was solved.

Why you are getting 120V between the neutral and ground (obviously they aren't tied) is that you have a bit of leakage into the neutral. A little is ok unless it trips the GFCI protecting the galley outlets.

So tie the neutral and ground and see what happens.

David
__________________
djmarchand is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Changing Boat from Single 30amp to Two 30amp Off 50amp Spliter johnar Electrical: Batteries, Generators & Solar 7 13-07-2017 15:44
50amp Shorepower Installation Ultimarv Electrical: Batteries, Generators & Solar 2 14-01-2010 06:21
For Sale: New Norcold 120vac/12vdc Refrigerator / Freezer - Seattle Area Cheechako Classifieds Archive 0 22-09-2009 16:14
120vac Refrigeration Questions nine lufts Plumbing Systems and Fixtures 45 04-08-2009 19:34
Neutral or In Gear When Sailing chkrhntr1945 Engines and Propulsion Systems 52 30-01-2009 08:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:40.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.