I think that this is the problem with table 210.21[B],[2]. It seems that it is based on 80% load regardless of the rating of the branch circuit. It indicates the TOTAL cord and plug-connected load of two or more receptacles connected to a branch circuit, so according to that table, whether you connect one piece or twenty pieces of equipment at the same time, the total continuous or non-continuous load not can’t be more than specified there. This seems not to coincide with the 80% load for continuous use, whether the conductors are sized at 125% or not. Very strange because most cord and plug connected equipment that I know of is usually non-continuous, which should allow for using these receptacles at 100%.
