"Recognized class of workers" means a class of workers recognized by the Labor Commissioner as being a distinct craft or type of work for purposes of establishing prevailing rates of wages. The term includes a class of workers for which the Labor Commissioner has traditionally established a prevailing rate of wages and any other class of workers the Labor Commissioner determines to be a distinct craft or type of work either on his or her own accord or after conducting a hearing pursuant to NAC 338.090.
Nev. Admin. Code § 338.007
NRS 338.012