Electrical apparatus and instruments, namely switches, circuit breakers, separating switches and other electrical power switching or cutting apparatus, transformers, control boards and distribution panels, transformer stations and other metal-cased or unsheathed electrical installations, enclosures, cupboards and cells containing electric equipment, electrical conduits, rectifiers, semiconductors, electric relays, condensers, resistors, inductors, printed circuits, miniaturized circuits, statistical converters; computers; computer software