- Hard to Find Information (on Distribution System Characteristics and Protection)*

Typically, however, lines are generally 10 miles or less. Short-circuit levels at the substation are dependent on voltage level and substation size. e average short-circuit level at a distribution substation has been shown, by survey, to be about 10,000 A. Feeder load current levels can be as high as 600 A but rarely exceed about 400 A with many never exceeding a couple of hundred amperes.