Be glad the ICC was convinced not to try and write a new electrical code, they were trying, but realized the NEC has too solid of a following to try and compete.
They of course wrote a primarily administrative code because at the time the ICC was created the NEC did not have the admin section yet. Plus it is coordinated with the rest of the ICC building codes which has pretty much taken over as the standard code across the country. (That of course was the intent of BOCA, ICBO, and SBCCI to merge and have a code that everyone could follow where ever they were in the country. and to sell more books.)
I don't know how the 'international' part has been accepted though.
Of course don't forget that if the town has the Int'l Residential Code adopted, that it has a complete electrical code embedded in it. The embedded code is NEC verbage but with a different formatting. This worries me as you need to be sure they didn't change a word or two that could change the meaning of the sentence or paragraph.
Just something to keep in mind.