8406.82 - Of an output not exceeding 40 MW:

This HTS category, 8406.82, encompasses steam turbines and other vapor turbines, as well as their parts, specifically those designed to produce an output *not exceeding* 40 megawatts (MW). These machines are crucial components in various industrial processes, primarily for generating power through the expansion of steam or other vapors. The classification hinges on the rated power output of the turbine, differentiating it from larger capacity turbines.

In contrast to its sibling category 8406.81, which covers turbines with an output *exceeding* 40 MW, this section is for smaller to medium-sized turbine units. This distinction is vital for accurate tariff assessment, as different power output ranges may be subject to varying import duties or trade regulations. The physical size, complexity, and intended application of the turbine are secondary considerations to its specified power generation capacity in determining its placement within this sub-heading.

Within this category, further specificity is provided by subheadings. HTS 8406.82.10 is reserved for steam turbines, which are the most common type of vapor turbine and directly utilize steam as the working fluid. The remaining turbines falling under this output limitation are classified under HTS 8406.82.90.00, "Other," which would encompass turbines powered by different vaporous substances or those with unique operational principles not exclusively defined as steam turbines.