NEC stands for National Electrical Code, and applies everywhere in the USA, even in places with no inspection department. You can get away with anything there, until an accident happens and the insurance refuses to pay due to non-compliant wiring being the cause of the house fire.areas adopt different codes.
A local code can require more than the national code, but never less. NEC is the minimum requirement. So local can require an emergency shutoff on residential spas, but cannot eliminate that requirement on public pools.