Input-output norms for current transformers define permitted input proportions and require imported inputs match export use. Standard input-output norms for Current Transformers above 12.5 KV up to and including 24 KV (Indoor Type) specify permissible input composition and proportional weights for CRGO steel laminations/coils with insulating coating, nickel-iron magnetic strips/coils, copper winding, electrical grade insulating paper, mild steel sheets/coils, and epoxy resin; these proportions form the benchmark for imports under the Foreign Trade Policy and applicants must ensure imported goods are those used or required in the export product.