Hey Russ,
Does the state legislature adopt it?, or is it a county or municipality? The way I understand it is, the UCC, or even the NEC, for that matter, doesn't dictate anything until some entity is given the legal power to enforce the code. If it is the State, the "law" ends at the border, same for the county or city or etc.
In Minnesota, the State adopts the NEC for the whole state. Yet, the State Legislature says very little about when and how upgrading of wiring in existing occupancies is to occur. In Minnesota, that is left up to smaller agencies such as the County, City, Municipality or Township.
Interstingly, a seperate set of requirements comes from mortgage underwriters and insurance companies in the form of offering to do buisiness if the dwelling meets their own requirements. These, of course, are not required "by law", and can be ignored if another mortgage or insurance policy can be procured somewhere else without the requirements.
