This chart is intended as a guide only.  It is used to indicate current carrying capacities of various
types of copper wires & insulations: single lead wires or cables, in ambient temperatures (25°C/78°F)
and a frequency of 60 Hz.

The values shown are approximate & apply to the individual conductors.

As an electrical current flows through a conductor, heat is generated.  Since heat must be dispersed,
many factors must be considered before a safe current rating can be used in a wire or cable
construction.   Some of these considerations are: the maximum temperature rating of the insulation
on the wire, or the jacket used for the cable.  Also, the ambient temperature, the electrical cycle,
the number of conductors in the cable, the conductor AWG size, & the heat transfer characteristics
of the system.  

The user of this chart should also consider that all insulation temperature ratings are time dependent.
Running an insulation at a higher service temperature will result in a shorter life expectancy due to
aging conditions.   Thus system design life must also be considered when applying maximum current
ratings.