Branch circuit or feeder (in your case it is a feeder), table 310.16 applies. Chances are your SER cable contains aluminum XHHW and you would need to apply the 75 Deg. cloumn. Assuming, as iwire said, that the terminal temp. rarings are 75. I've yet to see modern terminals that are only rated to 60.
Table 310.15 only applies where the conductors are either Service Entrance conductors, of a Feeder which is the main power feeder to a dwelling (that is not the case with your feeder). This would be the case, however, where a Service Panel is remote from the Service Disconnect. Then the feeder between the disconnect and the panel would be applicable to Table 310.15(B).
That being said, I regularly see #2 SER, protected at 100 amps feeding subpanels, and they have been approved.
[This message has been edited by Redsy (edited 06-19-2003).]
