Predominant function controls tariff classification: PLCC equipment falls under electric control and distribution heading, not telephony.

PLCC equipment used mainly for protection, telemetering, telecontrol and electricity distribution in high-voltage transmission lines was held to fall under Heading 8537, because tariff classification depends on the equipment's predominant function and essential character. The majority ruled that the incidental speech function did not make it an apparatus for line telephony or line telegraphy under Heading 8517, and Heading 8541 did not apply once the equipment formed part of a carrier-current line system. A dissent took the view that the system remained classifiable under Heading 8517 as an integral carrier-current line component.

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Issues: Whether PLCC equipment is classifiable under Heading 8517, Heading 8541, or Heading 8537.

Analysis: The equipment was found to be used primarily for protection, telemetering, telecontrol, and distribution of electricity in high-voltage transmission lines. Its speech function was only incidental. The majority held that it was not an apparatus for line telephony or line telegraphy within Heading 8517, and that Heading 8541 did not govern once the equipment was integrated into a carrier-current line system. On its nature and predominant use, the equipment was considered more appropriately covered by Heading 8537 as boards or panels used for electric control or distribution of electricity.

Conclusion: The equipment is classifiable under Heading 8537 and not under Heading 8517 or Heading 8541; the Department's appeals fail.

Dissenting Opinion: S.K. Bhatnagar, Vice President held that the equipment was an integral part of a carrier-current line system and therefore fell under Heading 8517. He would have allowed the Department's appeals and dismissed the cross-objections.

Ratio Decidendi: For tariff classification, the heading corresponding to the predominant function and essential character of the equipment governs, and an item integrated into a system for electric control and distribution is not classified under a telephony heading merely because it contains electronic components or an incidental speech function.

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