Newbie on House Power
Vince, you are ok to plug into the house voltage as long as you don't overload the system. Please bear with me if you already know most of this but here are a few basics all of us need to know about plugging into different amperage outlets. First, there is a voltage loss when running current over a long distance through wire that is of insufficient gauge. Any time you plug into household 20amp service use a #12 (often labeled "heavy duty") extension cord and do not exceed a 50' run. You will over heat a smaller gauge and possibly start a fire. Second you can figure how much power your RV will be using by adding up the total amperages used by the different appliances in your unit...or your house for that matter. An AC unit in and RV is usually 12-15amp. The tricky part here is depending on the age of the unit or the type of compressor motor the starting amps or volts may be a good percent higher and if the supply is not there it will blow breakers or fuses. Many times appliance current requirements are listed in watts. No problem, amps = watts/volts. 1500 watts = 1500/120...or 12.5amps. Just add up all your appliance amps. AC+Microwave+Blender+etc and This will give you your electrical load. Don't exceed the rating of your outlet (15, 20,30 etc.) and use wire rated for that current, and you will be fine.
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