You're right and thanks for the correction Jim. I shouldn't answer questions from old memories. 60?C (140?F) would still be very warm to the touch and could easily cause a second degree burn under the right conditions. Nevertheless, a 150?F reading is excessive under any conditions.
For the trivia people.
Based on the NEMA standard AB-1-1986 (yeah I know its old).
Maximum Temperature rise limits above rated ambient at 100% load:
Contact parts, copper - 45?C
Metal parts - Limited solely so that damage is not caused to itself or insulating materials
Main operating means, parts of insulating material - 60?C (based on 25?C ambient)
Main circuit terminals for external connections - 50?C
If temperature rises on wiring terminals exceed 50?C, the manufacturer shall specify conductors with 90?C insulation sized using the 75?C ampacity.