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Old 11-28-2010, 12:31 PM   #1
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Generator extension help needed

Hello, I'm trying to get a 30 amp 4 prong male plug that goes into my generator with at least 50' to 65' of extension with the 50 amp twist end that goes into my 5th wheel without having 3 and 4 adapters. My trailer is 40' long. I have the short plug for the generator that gives me a 30 amp end. I have a 25' 30 amp extension that I plug into a 30 amp to 50 amp adapter that plugs into my 50 amp wire that plugs into my trailer.....lots of plugs....lol. Any help is appreciated. No extensions and adapters would be nice... Thanks
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Old 11-28-2010, 01:28 PM   #2
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Sounds like a DIY project to me but will be costly.
You can purchase the necessary ends at Lowes, Home Debit or
a well stocked electrical supply house.
Buy as much rubber cable as you need and make it up yourself.

USE EXTREME CAUTION that you get the right wires where they
belong!!

It would be easy to get this wrong and fry something expen$ive.
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Old 11-28-2010, 03:45 PM   #3
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Use care with the patch cord for sure. The 50 amp RV plug pinouts and the generator pinouts have to match or there will be smoke.

Is your generator 4 lug plug 220 AC or 110 AC?

My Yamaha EF30SeB is 110 and my Honda house backup generator is 220. BOTH use the same socket pattern.
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Old 11-28-2010, 04:56 PM   #4
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I copied and pasted the following from the generator manual. Can I still make my own?

120/240 Volt AC, 30 Amp Locking Receptacle — May be used to supply electrical power for the operation of 120 and/or 240 Volt AC, 30 Amp, single phase, 60 Hz electrical, lighting, appliance, tool and motor loads. 120/240 Volt AC, 30 Amp, Locking Receptacle

Use a NEMA L14–30 plug with this receptacle. Connect a 4–wire cord set rated for 250 Volt AC loads at 30 Amps (or greater) (Figure 5).You can use the same 4–wire cord if you plan to run a 120 Volt load.

This receptacle powers 120/240 Volt AC, 60 Hz, single phase loads requiring up to 5,550 watts of power (5.55 kW) at 23.1 Amps for 240 Volts or two independent 120 Volt loads at 23.1 Amps each. The outlet is protected by a double pole rocker switch circuit breaker.
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Old 11-29-2010, 07:59 AM   #5
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Does your manual have a "pin out" of the socket on your generator?
Does anyone have a pinout on the 50 amp RV side of the shore cable?

Here is a source for the 4 prong 30 amp generator plug

Honda Generator Locking Plug 30A 125/250V (4-prong) Style G

Here is a source for the 50 amp female. (seems pretty expensive)

RV Female Connector 50 Amp - 55-8882
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Old 11-29-2010, 08:16 AM   #6
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In a few words yes.... Your genny is putting out 240 V AC which
can be split by the cord into 2 or more 120 V circuits.
I have a similar genny at home. It came with a cord set that
plugs into that funny looking 4 prong outlet you also have on yours.
The cord set splits into 4 120 V plugs.

I purchased and made up a cable that goes from that outlet
on my genny to a 240v connection on my home fuse box.
This allows me to power my entire house during a power failure.
(Can't run my home air conditioner or electric dryer but pretty much everything else will work.)

Go here and read up about 50 amp RV service requirements.
The 50-amp 120/240-volt 3 pole 4

It says in part that most 50 amp RV service is 2 circuits of
120v each.
Since this is what your genny also says all you have to do is
connect the pins on each end correctly.
Be aware that your genny will not put out 2 "legs" of 50 amp power
but it will get the job done for most items in the RV.
In other words you can't use a clothes dryer or run both roof
AC units at the same time.
(Lesson in wattage-- watts = Amps x Volts)
Watts = 50 amps times 120 volts
Watts = 6000
Your RV has TWO 50 amp legs so it can theoretically
use as much as 12,000 watts.
Your genny is rated at 5500 watts.
Just don't try to turn on too many things at once!!

This is my take on your situation. If you have doubts about how
to connect these devices please seek the advice of a qualified
electrician.
I'm just saying it will work if done correctly.
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Old 11-29-2010, 08:23 AM   #7
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IMHO,

Go get a qualified electrician to make up a cord for you. Give him the info on your genny and 5ver. You know the old saying "You can pay me now or you can pay me later" If you do the pay me later you can rest assured it will cost far more than paying now. It shouldn't cost that much to get someone to make the cable especially if you talk to them and get a list of what you need and go buy the parts yourself and take them back.
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Old 11-29-2010, 08:49 AM   #8
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Thank you all for your help......I have to get my Christmas wish list together...hmmm...wire, ends and an electrician. lol.
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Old 11-29-2010, 09:09 AM   #9
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I can make you a wiring diagram if you can get me the pinouts of both connectors you're planning to use (the NEMA number of both will do).

If you're not very comfortable doing the work I highly suggest getting someone that is, like stated a few times above.

For 65' at 30 amps you'll need #8 AWG wire. You'll want SO (rubber insulation) cord and that's gonna be expensive!
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Old 11-29-2010, 10:39 AM   #10
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the power cord ur looking for that will twist lock into ur gen is a standard off the shelf item at lowes or home depot.
to adapt this back to the 50 amp, if you choose the extension that splits the 220 into 2 110 circuits, you can always buy one of those boxes from camping world that takes two 110 inputs then outputs it to a 220 socket. the electrician may be the cheaper way. there may be other adapters that do the same job in one step.
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