NEC 680.8A states service drop wires must have 22.5 clearance from swimming pool water.
Yet when I looking at graphics for service drop clearances online, I see many say 18 feet. Which implies at some point, the NEC changed the rule from 18 feet to 22.5 feet.
Does anyone know an exact year when the 22.5 rule was made?
Image on nachi.org showing 22.5 feet:
Image on nachi.org forum showing 18 feet: