Continuous current capacity of bundled cables for aircraft

Electric cables installed in aircraft are normally tied together in bundles for a portion of the cable run from the bus to the individual load device. As a consequence, the temperature of a particular cable depends not only on the current which it carries but also on the currents which flow simultaneously in other cables of the group. The problem of the current capacity of cables in bundles can be stated as follows: given any set of currents, how shall individual cables of the proper size be selected so that their limiting temperature is not exceeded when the cables are arranged in a bundle; or, stated conversely, given any specified bundle of cables, what is the combination of currents which may be carried by the cable group.