8502.20.00 - Generating sets with spark-ignition internal combustion piston engines

This HTS category, 8502.20, specifically classifies generating sets powered by spark-ignition internal combustion piston engines. These are self-contained units designed to produce electrical energy where a primary power source is unavailable or insufficient. The defining characteristic is the use of a gasoline or similar spark-ignited fuel engine as the prime mover to drive the generator. Examples include portable generators commonly used for recreational purposes, backup power in homes, or job sites.

It is crucial to distinguish this category from its siblings. Unlike generating sets powered by compression-ignition engines (diesel or semi-diesel), the prime mover here utilizes a spark plug to ignite the fuel-air mixture. Furthermore, this category is separate from "Other generating sets" which would encompass those not fitting the spark-ignition or compression-ignition engine criteria, and also distinct from electric rotary converters, which are used for changing the form of alternating current.

Within this classification, subcategories are established based on the electrical output capacity of the generating set. These subdivisions, indicated by the trailing digits, are critical for accurate tariff application, differentiating between smaller, portable units and larger, more powerful industrial or commercial backup systems. Understanding these output thresholds ensures that the correct duty rate is applied based on the generator's capabilities.