Level 1: Common household circuit, rated to 120 volts AC and 15 amperes. These chargers use the standard three-prong household connection, and they are usually considered portable equipment.
Level 2: Permanently wired electric vehicle supply equipment used especially for electric vehicle charging; rated up to 240 volts AC, up to 60 amps, and up to 14.4 kilowatts.
Level 3: Permanently wired electric vehicle supply equipment used especially for electric vehicle charging; rated greater than 14.4 kilowatts. Fast chargers are rated as Level 3, but not all Level 3 chargers are fast chargers. This designation depends on the size of the battery pack to be charged and how much time is required to charge the battery pack. A charger can be considered a fast charger if it can charge an average electric vehicle battery pack in 30 minutes or less.