Where is the reference?????? I don't see anything here!II. Installation
338.10 Uses Permitted.rticle
(B) Branch Circuits or Feeders.
(4) Installation Methods for Branch Circuits and Feeders.
(a) Interior Installations. In addition to the provisions of this article, Type SE service-entrance cable used for interior wiring shall comply with the installation requirements of Part II of Article 334.FPN: See 310.10 for temperature limitation of conductors.
Article 338 specifically excludes 334.80 which is about NM anyway.
334.80 Ampacity.
The ampacity of Types NM, NMC, and NMS cable shall be determined in accordance with 310.15.
The ampacity shall be in accordance with the 60°C (140°F) conductor temperature rating. The 90°C (194°F) rating shall be permitted to be used for ampacity derating purposes, provided the final derated ampacity does not exceed that for a 60°C (140°F) rated conductor. The ampacity of Types NM, NMC, and NMS cable installed in cable tray shall be determined in accordance with 392.11.
Table 310.16 90 degree column #2 AL = 90 amps. so what?
Table 310.16 60 degree column, #2 AL = 75 amps.