OK, I don't want to hijack the transformer thread, so I'm starting a new one for this. So we are discussing load calculations, and the requirements in 210.20A and 215.3.
Two of you have basically said the same thing:
Why do you say it doesn't apply directly to the sizing of the OCPD? The code section specifically says "the rating of the overcurrent device shall not be less that the noncontinuous load plus 125 percent of the continuous load.
Two of you have basically said the same thing:
IIRC, the 25% thing only applies to ampacity of conductors and not directly to sizing OCPD.
The 25% "thing" doesn't apply to conductor ampacity... it applies to minimum conductor size... and it does apply directly to OCPD sizing where not 100%-rated equipment.
Why do you say it doesn't apply directly to the sizing of the OCPD? The code section specifically says "the rating of the overcurrent device shall not be less that the noncontinuous load plus 125 percent of the continuous load.