my interpetation was that anything smaller than 14ga could only be used in fixtures and control panels but not for fixed wiring in a building.
Your statement is correct. 16 ga should not be used for the wiring in this building. In Table 310.16 that 18a you see is under the 90C column and that could only be used if wiring was connected to terminals with a rating of 90C. Breakers are either 60C or 75C (some older ones even 40C) If you notice, there is no ampacity under the 60C and 75C columns for 16ga wire.
[This message has been edited by Bill Addiss (edited 03-11-2002).]