Static converter classification keeps industrial PC power supplies in their own heading while allowing conditional customs-duty exemption.

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....Motherboards imported without processors and RAM for assembly into an industrial computing platform are classified as parts of automatic data processing machines under Tariff Item 8473 30 20. Model-specific chassis designed solely or principally to house that platform's components are likewise classified as machine parts under Tariff Item 8473 30 99. AC-to-DC power supply units perform rectification and are independently classifiable as static converters under Tariff Item 8504 40 29, rather than as machine parts, because of their specific coverage in Chapter 85. Static converters designed for an automatic data processing machine may receive the applicable customs-duty exemption, subject to notification conditions, BIS certification, and import verification.....