"Tower crane" means a crane that is regularly assembled and disassembled for use at various sites, and is powered by an electric motor or an internal combustion engine, or any variation thereof which retains the same fundamental characteristics, including cranes on which the operating radius is adjusted by means of a boom luffing mechanism, or by means of a trolley traversing a horizontal boom, or by a combination of the two. The term includes cranes which:
Nev. Admin. Code § 618.355
NRS 618.295, 618.880