Your post is apparently aimed at me, not Ralph.
The quoted section from me is about 15A receptacles (2 or more) being limited to 80%, even for non-continuous. Your reply is not relevant.
What code requirement is exceeded?
I assume ISA is IS.
You just said "a 20 amp outlet is not specifically allowed on a 15 amp circuit"
You now seem to be saying, again, a 20A receptacle is OK on a 15A circuit.
- a grounded 20A receptacle is not allowed by 406.4-A
- there was a 2008 proposal (I looked at only 4 cycles) to change this
- the code panel for 400 (above) does not agree with the code panel for 210
- g, an inspector who applies the NEC, had trouble believing what the NEC said
Example of problem - 20A single receptacle for an air conditioner that is on a 15A circuit. Are air conditioners with a 20A plug readily available?