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07-21-2011, 01:55 PM
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#1
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4 Rivet Member
1977 31' Sovereign
Manchester
, New Hampshire
Join Date: May 2006
Posts: 347
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Shore power requirments for trailers
Ok I have some questions about shore power . I have knowledge electrical work so not ignorant to subject. Is the shoreline power 220 volt or 120 volt ? Or can it be both? These questions I am just curious about . Now as far as my trailer goes I have shore power cable connected to a 14/3 25 foot three prong extension cable plugged into 120 volt outlet on a 20 amp breaker. Problem is I can run A/C no problem but if I run say box fan at same time it trips circuit breaker inside house there is no load inside house except clock radio and tv . Is my extension cord the problem ? Just some more info if I shut off A/C and use fan I am fine. I have some question I'll post in different post later.
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer
2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
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07-21-2011, 01:58 PM
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#2
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Rivet Master
1981 27' Excella II
mays landing
, South Jersey
Join Date: Nov 2009
Posts: 1,179
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You need 30 amps. Sal.
__________________
Sal & Nora
Let us live so that when we die even the undertaker will be sorry. Mark Twain
AIR 42483
TAC N.J. 17
WBCCI 24740
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07-21-2011, 02:00 PM
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#3
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Wise Elder
2010 30' Classic
Vintage Kin Owner
South of the river
, Minnesota
Join Date: Dec 2009
Posts: 4,169
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Depends on the trailer.
Traditionally shore power has been 30A 120V service using a NEMA TT-30R receptacle, which provides neutral, hot, and ground. Most Airstream trailers require this kind of service. It's probably what you need.
Some newer trailers with dual air conditioners use 50A 120/240V service using a NEMA 14-50R receptacle, which is four-wire receptacle with 2 hots, neutral, and ground.
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07-21-2011, 02:02 PM
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#4
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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I wired a 120v 30A outlet next to our parking pad, and tested it with the standard AS power cord plugged into a 25' 30A extension cable from Camping World, doesn't trip any breakers.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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07-21-2011, 03:36 PM
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#5
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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If not modified, you trailer is meant for a 120 volt 30 Amp source. The trailer side male can look a little misleading.
A 10 AWG cord can help. I have had success with replacing the female end of a 10 AWG cord with a 30 amp RV female and leaving the 15 amp plug on the male end.
The best would be to add a dedicated 30 circuit solely for the trailer.
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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07-21-2011, 03:50 PM
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#6
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Aluminum Falcon Mechanic
1972 31' Sovereign
Wesley chapel
, Florida
Join Date: May 2011
Posts: 1,169
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Here is what the 120/240 50a looks like on the bigger load trailers
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07-21-2011, 03:55 PM
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#7
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Chief Chili Cook
2010 30' Flying Cloud
Bakersfield
, California
Join Date: Feb 2009
Posts: 738
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Quote:
Originally Posted by Mrcrowley
Now as far as my trailer goes I have shore power cable connected to a 14/3 25 foot three prong extension cable plugged into 120 volt outlet on a 20 amp breaker.
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The 14 gauge extension is going to have a lot of power loss over 25 feet. So even if it's not making it all the way to the trailer you're drawing more than 20 amps at the panel. These RV extensions are at least 10 gauge.
30A RV Extension Cord
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07-21-2011, 03:57 PM
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#8
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Aluminum Falcon Mechanic
1972 31' Sovereign
Wesley chapel
, Florida
Join Date: May 2011
Posts: 1,169
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Ya that's like a 25' long heating element
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07-21-2011, 04:34 PM
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#9
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4 Rivet Member
1977 31' Sovereign
Manchester
, New Hampshire
Join Date: May 2006
Posts: 347
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I'll go make up a 10/3 cord what about the male end on three prong house plug that should be 30 amps to correct? (if they make them) . Or should make a dedicated 20 amp circuit for trailer?
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer
2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
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07-21-2011, 04:38 PM
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#10
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Aluminum Falcon Mechanic
1972 31' Sovereign
Wesley chapel
, Florida
Join Date: May 2011
Posts: 1,169
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Quote:
Originally Posted by Mrcrowley
I'll go make up a 10/3 cord what about the male end on three prong house plug that should be 30 amps to correct? (if they make them) . Or should make a dedicated 20 amp circuit for trailer?
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Why not a dedicated 30a breaker / outlet and 10/2 cord
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07-21-2011, 05:01 PM
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#11
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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If you are going to go to the trouble to add a circuit, I agree with darkspeed, why not pull 10/2 with ground and install a standard 30 amp rv recip?
If adding a circuit is going to be a while, certainly upgrade to a realistic cord.
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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07-21-2011, 05:05 PM
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#12
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4 Rivet Member
1977 31' Sovereign
Manchester
, New Hampshire
Join Date: May 2006
Posts: 347
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Quote:
Originally Posted by Darkspeed
Why not a dedicated 30a breaker / outlet and 10/2 cord
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Actually the shore line is 10/3 neutral,ground and line I'll just make a dedicated line from breaker box with shore line female receptacle problem solved .
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer
2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
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07-21-2011, 05:19 PM
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#13
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Aluminum Falcon Mechanic
1972 31' Sovereign
Wesley chapel
, Florida
Join Date: May 2011
Posts: 1,169
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Lowes and homedepot have exterior nema boxes with a preinstalled rv female receptical. 30 or 50a...Super easy.
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07-21-2011, 05:24 PM
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#14
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Aluminum Falcon Mechanic
1972 31' Sovereign
Wesley chapel
, Florida
Join Date: May 2011
Posts: 1,169
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08-01-2017, 04:00 PM
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#15
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2 Rivet Member
Currently Looking...
Virginia Beach
, Virginia
Join Date: Jan 2017
Posts: 22
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I'm setting up shore power at my house for a 28 ft FC with 2 AC's and 50 amp service. The airstream manual says not to
exceed 110 volts. However, my service is 220. Will the 220 volts blow my circuits on my 50 amp airstream???
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08-01-2017, 05:12 PM
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#16
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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Yes 220 will damage your coach.
While the system is 3 wire with a ground. It is setup for two 120 volt legs.
Make sure the person installing your service understands this.
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08-01-2017, 05:19 PM
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#17
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,673
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Quote:
Originally Posted by TG Twinkie
Yes 220 will damage your coach.
While the system is 3 wire with a ground. It is setup for two 120 volt legs.
Make sure the person installing your service understands this.
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I believe the above is in reference to the fact that the 30A RV connector is very similar to a dryer connector and electricians without RV experience have wired the RV connector with 240V and ground (no neutral).
50 amp service is a 4-wire service, Hot 1 (Red), Hot 2 (Black), Neutral (White), and ground (Bare or Green). It is 240V line to line (red to black), 120 volts line to neutral (red or black to white) with a 50A breaker in each hot leg. The reference to 110/220 volt is old data; the line to neutral voltage has been 120 for years. The Airstream uses the 50 amp service as two independent 120 volt services (Hot to Neutral) and puts different things on the two legs. You will be fine as long as your electrician provides the neutral and wires it properly.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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08-01-2017, 06:12 PM
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#18
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by Mrcrowley
Ok I have some questions about shore power . I have knowledge electrical work so not ignorant to subject. Is the shoreline power 220 volt or 120 volt ? Or can it be both? These questions I am just curious about . Now as far as my trailer goes I have shore power cable connected to a 14/3 25 foot three prong extension cable plugged into 120 volt outlet on a 20 amp breaker. Problem is I can run A/C no problem but if I run say box fan at same time it trips circuit breaker inside house there is no load inside house except clock radio and tv . Is my extension cord the problem ? Just some more info if I shut off A/C and use fan I am fine. I have some question I'll post in different post later.
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A 14ga ext cord is for 15amp and 12ga is for 20 amp. Swap your cord for a 12ga or 10ga cord and you should be good to go.
__________________
The higher your expectations the fewer your options.
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08-01-2017, 06:34 PM
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#19
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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Old school dryers used a 3 prong plug and receptacle. The neutral and ground were tied together.
Modern dryers are 4 wire where the ground is separate from the neutral. Dryers require 240 volts but only for the heating element. Everything else requires 120 volts.
We are talking electric dryers.
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08-01-2017, 07:08 PM
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#20
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diesel maniac
Airstream - Other
Tucson
, AZ
Join Date: May 2017
Posts: 2,545
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As a career sparky I am amazed at the electrical knowledge of some of you Streamers. I usually read all of the electrical posts and rarely find anything to correct. Not so on other forums, even most guys on my welding forum don't know anything about electricity and on the truck forums the incorrect advice given is overwhelming. I guess Streamers are just a brighter bunch. Wonder if the SOB guys are the same? The only thing I will add, that I didn't see mentioned, is when wiring your shore power pay close attention to where each wire goes. New TT receps have the colors printed by each terminal so you don't end up with reverse polarity. Used to be shiny silver to white and brass to black but now all the TT receps have the same color terminals so you have to look for the print.
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