HTS code 9902.16.90 covers "Assemblies each comprising a chassis or shelving of subheading 8517.70 combined with a backplane (panel/distribution board) equipped with two or more apparatus of heading 8535 or 8536, for electric control or the distribution of electricity, for a voltage not exceeding 1,000 V (provided for in subheading 8537.10.91)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.