Current rating of electric cables

This paper is a discussion of the current carying capacity of electric power cables. The limiting temperatures are discussed. The relation of the temperature rise of cables suspended in free air to the rise under other conditions is considered, the rise in free air being treated specifically, formulas being given for the calculation of this rise. The rise of temperature with loads of brief duration is discussed. Tables are given showing permissible overload ratings, these tables being applicable under all ordinary conditions.