Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-07-2014, 13:39   #1
Registered User

Join Date: Jan 2012
Location: Pittsburgh, Pa. Boat Antigua
Boat: Oyster 49
Posts: 71
Shore power plugs

I had a shore power cable with a male 50A/125v plug. To use it on 50A 125/250v dock box I use an adapter cable. I had some corrosion problems with the male plug on my shore power cable so I replaced it with a 50A 125/250v male plug so I wouldn't have to use my adapter.

The issue I have is that the shore power cable is 3 wire, and the new plug is 4 wire. With the wires connected to ground, neutral and 1 of the two hots, I am getting 120v and the polarity is correct. With this setup am I able to get 50A? Does the adapter combine the two hot terminals from a 50A 125/250V shore power source to give a higher amperage? If it doesn't combine the two phases what does the adapter achieve? As I am metered on usage, does pulling power from one phase mean that I am paying for more than I use? Is the meter is recording amps used and assumes I am pulling from both phases - taking the amps and multiplying by 220v to get kwh, instead of the 110v I am actually using?
__________________

__________________
neilsty is offline   Reply With Quote
Old 29-07-2014, 15:27   #2
Registered User
 
wingless's Avatar

Join Date: Aug 2013
Boat: 2000 Searay 380 Sundancer
Posts: 487
Re: Shore power plugs

The wiring diagram for these plugs is shown in this Hubbell Marine Products Catalog.

The 50A / 125V pinout is shown in the top right corner of pg 17 / pg 11.

The 50A / 125V/250V pinout is shown in the top right of pg 18 / pg 12.

The watt-hour meter shows the energy consumed, regardless of the voltage(s) being drawn.
__________________

__________________
2000 SeaRay 380 Sundancer Mercruiser
454 MAG MPI Horizon 380hp / Westerbeke 7.0KW BCGB
many cool mods
wingless is offline   Reply With Quote
Old 30-07-2014, 10:45   #3
Registered User

Join Date: Jan 2012
Location: Pittsburgh, Pa. Boat Antigua
Boat: Oyster 49
Posts: 71
Re: Shore power plugs

Thanks Wingless. I am still unsure what the adapter cable does with respect to the X and Y terminals on the 50A 125/250v cable - does it just take one of these and connect it to the live terminal on the 50A/125v socket?
__________________
neilsty is offline   Reply With Quote
Old 30-07-2014, 11:58   #4
Registered User
 
wingless's Avatar

Join Date: Aug 2013
Boat: 2000 Searay 380 Sundancer
Posts: 487
Re: Shore power plugs

It is always best to use standard wiring w/ standard receptacles / plugs.

The modification under-discussion would create a non-standard wiring. The change does not appear to create a safety problem. An adapter would be a better solution.

The wiring diagram for the two plugs are shown.

For both plugs, G is ground, the green wire and W is neutral, the white wire.

The other pin(s) are the line connections, X and Y are L1 and L2 on the NEMA L14-50, the opposite phases of the 125VAC line voltage, those would be black and red wires. The unmarked pin on the NEMA L6-50 is the single 125VAC line voltage, the black wire.

Yes, the adapter would take X or Y and feed that to the line input on the power cord.


NEMA L14-50 - 125V/250V / 50A



NEMA L6-50 - 125V / 50A
__________________
2000 SeaRay 380 Sundancer Mercruiser
454 MAG MPI Horizon 380hp / Westerbeke 7.0KW BCGB
many cool mods
wingless is offline   Reply With Quote
Old 03-08-2014, 11:55   #5
Zil
Registered User

Join Date: Mar 2013
Location: South Jersey
Posts: 239
Re: Shore power plugs

Your question. The plug is only connected to one side of the source. However if the source is fused/breaker at 50 amps 250 volt, then you could draw 50 amp at 125 volt before tripping. But is it wise?
__________________
Zil is offline   Reply With Quote
Reply

Tags
plug, shore power

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
Shore Power Plugs In Europe Roy M Electrical: Batteries, Generators & Solar 7 27-08-2012 12:02
Shore Power Plugs ronnoordhoek Electrical: Batteries, Generators & Solar 10 08-09-2010 14:20
Inverters and plugs Jack Long Electrical: Batteries, Generators & Solar 3 07-06-2008 11:43
12 Volt plugs gosstyla Electrical: Batteries, Generators & Solar 6 13-04-2007 10:37



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:24.


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.