Table 310.15(B)(6) only applies to 120/240 volt 3-wire single-phase dwelling services and feeders.
If the terminations on both ends of this #2 AL are rated for 75C the 75C column can be used which shows that ampacity as 90 amps. If the terminations on either end are only rated for 60C conductors then the 60C column must be used which shows the ampacity as 75 amps.
[This message has been edited by caselec (edited 07-31-2003).]
