Input-output norms for lightning arrestors prescribe component-specific import formulas and require imported inputs to match export use.

Input-output norms set component-specific import proportions for Class III Lightning Arrestors: tubular porcelain bushings are net-to-net; aluminium ingots scale with arrester KV; MOVs are quantified by arrester KV relative to varistor KV or by specified material weights per KV. Listed MOV inputs include spray-dried metal oxide powder and defined weights for specific oxides, metals, binders, and glass frit. Importers must ensure imported inputs match those used or required in the exported arrestor, with proportions determinative for admissibility.

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