Tesla Model 3 Extension Cord. NEMA 6-50 240 volt 50 amp breaker outlet installation guide Maximum 32 amp output Buy adapter for Gen 2 Mobile Connector. Setting the car for 10 15 or 20 amps may still give you a decent miles per hour range depending on your needs.
There are too many extension cords that are not rated high enough and too many ignorant people. Amazons Choice for tesla extension cord 25 Foot Lighted Outdoor Extension Cord - 123 SJTW Heavy Duty Yellow Extension Cable Extension Cable with 3 Prong Grounded Plug for Safety - Great for Garden and Major Appliances. Fast free shipping on most purchases.
A NEMA 14-30 connector extension will let you charge your Tesla with the common 4-prong or 3-prong 30 amps home dryer plug.
Tesla does not recommend the use of extension cords at all with the Model S. Explore charging options for your Tesla. If you are concerned about using the extension cord you could always charge at less than the maximum 24 amps. Although setting up your home charger out of a dryer outlet isnt recommended by Tesla it is a practical alternative for homes where the closest high voltage electrical outlet to the vehicle is an unused dryer plug.