The NEMA L5-20 is a type of electrical plug and receptacle designed for use in North America. It is rated for 20 amps and 125 volts, making it suitable for various applications, including power tools and appliances. The plug features a unique design with one blade oriented horizontally and the other vertically, ensuring it can only be connected in one way. This configuration helps prevent accidental disconnection and enhances safety. The NEMA L5-20 is commonly used in commercial and industrial settings, as well as in some residential applications, where higher power requirements are necessary.