Nope.
In the 2012 code section 4 has completely changed with regard to ampacity and the Canadian code has finally removed a standing error in calculating wire ampacity. All the product tests of temperature rated devices Like circuit brekers is based on 60 or 75 degrees but we have been applying ampacity of the 90 degree colums to all connections. So the rule may be affected by ambient and there are tables to derate for temperature or number of current carrying wires.
So a device like a circuit breaker creates some heat and the tests to calibrate the breaker are based on 75 degree wire. So if you terminate a wire on a breaker the ampacity must be based on the 75 degree columns of tables 1 to 4 and not the 90 degree column we have used for years.
