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Old 05-18-2010, 01:54 PM   #1
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Wink Shore Power Questions

I'm new and trying to find where to enter a new post. Looking to replace 30 amp cable, plugged in cable to 240 outlet and sparks flew, no power to unit. Every other power suppy works, battery, generator, etc. Any suggestions? Can I just buy a cable at Home Depot and do it myself. tired of waiting for shops to "fit me in."
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Old 05-18-2010, 01:59 PM   #2
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The 30 amp cable is supposed to plug into a 120 volt outlet.

You can buy replacement cables at any of a number of online RV stores. Tweety's, Adventure RV, Campingworld.
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Old 05-18-2010, 02:30 PM   #3
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One question to ponder is whether you have the detachable-type Marinco cable or the hardwired cable.
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Old 05-18-2010, 03:04 PM   #4
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No< no <no

Do not plug into 240 volts. Even though your cable plug looks like a 220/240 plug...it is not. Its is 30 AMP 115 volt. Get an adapter for the plug end if you want to plug it into a conventional household outlet. You may have already fried your electrical system. Hook up to good power and check things out..... fuses first if your lucky. You can get the cable...whichever type your replacing...at an RV shop or cheaper on EBAY....or Amazon.
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Old 05-18-2010, 03:34 PM   #5
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You can get male 30 amp cable end but not female, you have to use a 30 amp outlet in a box, neither lowes or home depot carried it, but that might be local management.
they didn't show it on line either. something about making an extension cord carrying 30 amps not safe. Osha must have gotten to management. ;-(
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Old 05-18-2010, 06:24 PM   #6
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Randy at Bestconverter.com has the 30amp box you need. Check his web site or give him a call.
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Old 05-18-2010, 07:41 PM   #7
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In this modern day and age of building codes, I am surprised a 120V, 30Amp plug would go into a 220V socket. Tell me it ain't so.

I would've bet a lot of money on that one!
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Old 05-19-2010, 08:19 AM   #8
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The 120 volt plug will not go into a 220 volt receptacle. A common mistake made by both amature an professionals is to wire the 120 volt receptacle to a 220 volt power source. I am not aware of a single travel trailer or motor home that is wired for 220 volts. My brothers 41 foot motor home has a washer and dryer and it is still a 120 volt unit.
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Old 05-19-2010, 08:26 AM   #9
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Oh! I meant to ask where the sparkes flew from. If it was just the cable, you may be OK. But if not, anything you turned on will be damaged. Hopefully you didn't try to start the AC. If it was just light bulbs they can be replaced, the fixture will probably be OK but visually check each one for damage. Most of the 120 volt wiring used in these situations is rated for 300 volts, so unless there was a direct short between the two conductors, the wiring itself will not be damaged. Good Luck!
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Old 05-19-2010, 10:41 AM   #10
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Quote:
Originally Posted by TG Twinkie View Post
The 120 volt plug will not go into a 220 volt receptacle. A common mistake made by both amature an professionals is to wire the 120 volt receptacle to a 220 volt power source. I am not aware of a single travel trailer or motor home that is wired for 220 volts. My brothers 41 foot motor home has a washer and dryer and it is still a 120 volt unit.
My trailer is wired for 110/220 volt, 50 amp service, as are many, and I have a matching shore power connection in my storage shed.

I agree though, that wiring the TT-30 plug for 220 volts is a common mistake.
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Old 05-19-2010, 12:56 PM   #11
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My trailer is 120/240V 50 amp also.
Must be a Minnesota thing. We're all power-crazy.
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Old 05-19-2010, 02:21 PM   #12
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ac voltage in wires is pretty much meaningless, until there is an amperage draw. fuses and circuit brkrs sense amperage, not voltage. electrical devices are rated at certain voltages, and amperages based on their mfg'g materials and processes.
assuming a 3 wire 30 amp 120vac wiring/device and assuming a 3 wire 240vac circuit of ? amps (today, 30and 50 amp ac devices are 4 wire, although 3 wire 50a circuits can still be found). both circuits have 3 wires; the 120vac has a hot, a neutral(a grounded conductor), and a grounding conductor. the 240vac 3 wire circuit will have 2 hots, and a grounded conductor. The 240vac circuit was the source, so there was momentarily at least one hot lead connected to a grounded conductor. Either a wire burned (fusible link) or a circuit breaker or fuse protecting the source operated. Because the expression "sparks" was used, The wiring probably burned. I agree with the idea that a 30amp 120vac male plug should not fit into a 240vac 3 wire female receptacle, but a visit to the website: "thereIfixedIt" will showcase the amazing adaptations mankind is capable of creating. I doubt anything on the coach suffered damage, although it may have. good luck, and yes, there is a simple way to make an adapter to connect a 30 amp 120vac male plug into a 240vac 3 or 4 wire circuit. ya just gotta know how to correctly connect the wires.
ol' bill
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Old 05-19-2010, 02:30 PM   #13
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I think we scared the OP away.
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Old 05-19-2010, 06:08 PM   #14
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Well, I learned something today about trailers being wired for 220 volts. But I must disagree with WMarsha. It's the voltage that penetrates the insulation of wiring. If the dielectric capacity of the insulation to withstand the potential is not high enough the voltage will penetrate the insulation. Think of voltage like you would pressure in a water supply system and the insulation of the wiring as the pressure rating of the piping in that water supply system. If the pipe is rated at 50PSI for example and the water pressure is 100PSI, the piping will not withstand the excess pressure and develope a leak. Even though there is no flow of water thru the system since all valves are closed. Voltage=Pressure: Current=Flow. You would not use wire rated a 300 volts on a system rated at a higher voltage such as 480 volts. Wiring used on 480 volt systems is typically rated at 600 volts. The voltage rating of wiring is as important if not more important than its ability to handle the current. Circuit breakers and fuses protect from over current, not over voltage. Even the black electrical tape you use for common wiring connections is rated for different voltages ie 300, 600 and higher ratings. If you have doubts about this, try using common household wiring for spark plug wires. The insulation will not withstand the high voltage produced by the ignition coil even though the relative current produced is low, typically measured in milliamps. 1 milliamp= 1/1000 amp.
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