Re: Definition of Amusement Attractions under NEC 525
525.1 Scope.
This article covers the installation of portable wiring and equipment for carnivals, circuses, fairs, and similar functions, including wiring in or on all structures.
Article 525 addresses the installation of portable wiring and equipment for temporary attractions, such as carnivals, circuses, and fairs. Article 525 is intended to apply to all wiring in or on portable structures, whereas Articles 518 and 520 apply to permanent structures. Installations for portable equipment used at carnivals, circuses, fairs, and the like, were formerly covered under Article 527, Temporary Installations. Article 525 was developed because the requirements for temporary installations contained in Article 527 apply more to construction sites than to events such as fairs and carnivals that are open to the general public. Additionally, Article 525 significantly expands the requirements and scope for installing electrical equipment at these locations. (From the Handbook)
That would seem to cover the local tractor dealer.