Definition of ampacity
: the maximum amount of current that a wire or cable can safely carry The longer the brush, the longer the life; therefore, when a brush is operating at 40 to 50 percent below the maximum current capacity (ampacity) per inch and has an extra long length, the motor can have a very long life. — A. N. Tsergas
Seen and Heard
What made you want to look up ampacity? Please tell us where you read or heard it (including the quote, if possible).