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3 or 4 wire male 50 amp plug
02-04-2011, 07:15 AM
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#1
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Aug 2009
Posts: 3,028
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The attached link advertises two different male 50 amp plugs. One is 3 wire and the other is 4 wire  Tweetys.com - RV Parts & Accessories - RV Hitches - Warn Products - Search .
I would think it should be 4 wire. Any thoughts?
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 2008 35e Bounder F53 V-10 Ford, 2009 HHR LT2 ,SMI stay-n-play duo, TST tpms.
Cliff,Tallulah and Buddy( 13 year old Shih-tzu )
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02-04-2011, 07:17 AM
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#2
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Community Administrator
Newmar Owners Club
Join Date: May 2000
Location: Newark, DE
Posts: 13,896
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50amp service is 4 wires.
The 3 wire plug pictured is a mislabeled 30amp plug.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, '07 DSDP, '11 Virtual RV
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02-04-2011, 07:23 AM
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#3
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Aug 2009
Posts: 3,028
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Quote:
Originally Posted by Route 66
50amp service is 4 wires.
The 3 wire plug pictured is a mislabeled 30amp plug.
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Thanks Dirk  . Just want to be sure. One can never be to careful with electric 
__________________
2008 35e Bounder F53 V-10 Ford, 2009 HHR LT2 ,SMI stay-n-play duo, TST tpms.
Cliff,Tallulah and Buddy( 13 year old Shih-tzu )
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02-04-2011, 07:35 AM
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#4
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Senior Member
Texas Boomers Club Winnebago Owners Club Workhorse Chassis Owner
Join Date: Jun 2002
Location: San Antonio, TX. USA
Posts: 693
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Sorry guys, plug cap is correctly rated for 30 or 50 amps. In the old days, a lot of electric ranges (for example) used a 3 wire as a 50 amp. ( 2 hots & ground)
Now days, 4 wire is standard.
Best,
ruppr
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Ruppr|Kris|2005 Itasca SunCruiser|Ultrapower
(toad) 2007 Ford Focus|Aventa LX|Brakebuddy
WIT|FMCA
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02-04-2011, 07:37 AM
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#5
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Community Administrator
Newmar Owners Club
Join Date: May 2000
Location: Newark, DE
Posts: 13,896
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Quote:
Originally Posted by ruppr
Sorry guys, plug cap is correctly rated for 30 or 50 amps. In the old days, a lot of electric ranges (for example) used a 3 wire as a 50 amp. ( 2 hots & ground)
Now days, 4 wire is standard.
Best,
ruppr
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OK, but for this discussion RV 50amp service is 4 wire.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, '07 DSDP, '11 Virtual RV
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02-04-2011, 07:56 AM
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#6
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Senior Member
Join Date: Aug 2006
Posts: 799
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4 wires and if you are missing one your RV is in deep trouble.
Hot (120 volts)
Hot (120 volts)
Neutral
Ground
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02-04-2011, 08:03 AM
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#7
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Moderator Emeritus
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 6,626
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Quote:
Originally Posted by Norm4015
4 wires and if you are missing one your RV is in deep trouble.
Hot (120 volts) L1
Hot (120 volts) L2
Neutral
Ground
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Slight but very important amplification on the above. From either hot to neutral you should read 120VAC. From hot to hot you should read 240VAC to keep from overloading the neutral conductor - if you read 0VAC, then both hots are in phase, a no-no as your RV should specify 120/240VAC 4 wire (split phase) service.
Rusty
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02-04-2011, 09:23 AM
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#8
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Aug 2009
Posts: 3,028
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Quote:
Originally Posted by RustyJC
Slight but very important amplification on the above. From either hot to neutral you should read 120VAC. From hot to hot you should read 240VAC to keep from overloading the neutral conductor - if you read 0VAC, then both hots are in phase, a no-no as your RV should specify 120/240VAC 4 wire (split phase) service.
Rusty
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Thanks to all. I'm just a little ( easily done ). The rating on the plug is 125/250 volt. I s that the same as 120/240 vac?
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2008 35e Bounder F53 V-10 Ford, 2009 HHR LT2 ,SMI stay-n-play duo, TST tpms.
Cliff,Tallulah and Buddy( 13 year old Shih-tzu )
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02-04-2011, 09:26 AM
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#9
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Moderator Emeritus
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 6,626
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Yep, you're fine.
Rusty
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02-04-2011, 10:30 AM
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#10
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Senior Member
Workhorse Chassis Owner Damon Owners Club
Join Date: Mar 2009
Posts: 8,078
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On the page you linked to all the connectors are 4 wire, ALL of them
In the lower right (on my browser) is a Marineco connector, This one appears to have only three connectors (3 slots) however it is really a 4 wire connector.. the forth wire is hidden in plain site.. It's the metal "Arc" (section) on the outside of the plug.
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02-04-2011, 01:28 PM
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#11
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Senior Member
Texas Boomers Club Winnebago Owners Club Workhorse Chassis Owner
Join Date: Jun 2002
Location: San Antonio, TX. USA
Posts: 693
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Concur completely about a 4 wire service requirement on 50 amp. for RV, my only point is the plug in question is NOT misidentified as being capable of 30 or 50 amp capacity/rating as the OP asked. It includes the spare blade (L shaped) to convert to a 30 amp configuration and as shown is a 50 amp. 3 wire male cap.
Didn't mean to start WWIII---------
Best,
ruppr
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Ruppr|Kris|2005 Itasca SunCruiser|Ultrapower
(toad) 2007 Ford Focus|Aventa LX|Brakebuddy
WIT|FMCA
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02-04-2011, 02:03 PM
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#12
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Senior Member
National RV Owners Club Freightliner Owners Club
Join Date: Oct 2009
Posts: 1,560
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What ever you do, don't ever plug into a range or welder recept.
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2011 Jeep Wrangler Unlimited Sport
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02-04-2011, 05:35 PM
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#13
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 4,925
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Quote:
Originally Posted by Vegasdan
What ever you do, don't ever plug into a range or welder recept.
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You are correct about the 3-wire plugs.
A 4-wire welder receptacle (240VAC) is identical to an RV 50A receptacle. They both are wired identically, and provide the same voltage and amperage. RV Electric
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