Apparatus for monitoring electrical components; apparatus for monitoring electrical instruments; apparatus for testing electrical apparatus; apparatus for testing electrical components; apparatus for testing electrical devices; apparatus for testing electrical instruments; apparatus for the testing of electrical circuits; cable for electrical transmission; connections for electrical purposes; connectors being electrical terminals; couplings for electrical cables; ducts for electrical wiring; ducts for housing electrical wires; electrical connections; electrical contacts; electrical couplings; electrical switch assemblies; electrical switch boards; electrical switch boxes; electrical switch cabinets; electrical switch timers; electrical switches; electrical switchgear; electrical switching apparatus; electrical terminal connectors; electrical terminals; electrical time switches; electricity boxes for electrical installations