electric apparatus for electric wiring installations; namely, switches, deviators, commutators, electric plugs and sockets, cartridges and wire type fuses, fuse holders, lamp holders for filament and fluorescent lamps, electric bells in general, bells for two or more tones, circuit breakers, air and oil bath isolators, low and medium power switches, mercury switches, solid state switches, motor starters, remote motor starters, electric panel boards for working sites, distribution boards, command and control boards, whether combinable or not, control desks, combinable control desks, ganged terminal blocks, derivation boxes with terminals, combinable terminal boards, fly terminals, pilot and warning lamps, whippings, apparatus and boards for signalling and warning, signalization apparatus and boards with guide-lamps and accessories, apparatus for detecting electric current leakage, phase test apparatus, apparatus for measuring electric magnitudes, security fuse bearers with plugs and sockets, notification and control apparatus, electronic apparatus mountable as common electric wiring devices; namely, photo electric relays, thermostats, sunset switches, level signallers, pressure signallers and limit switches, simple and bi-stable relays, timers and timer switches, electronic flashes, dimmers, earth leakage circuit breakers, thermomagnetic and earth leakage circuit breakers, small ganged circuit breakers which may be inserted in wiring device supports, small electric transformers, remote control switches, emergency relays, telecommunication apparatus with or without amplification, relay panels or boards, principal and auxiliary posts and shunts for voice transmissions, table apparatus for guard posts in hospitals, hotels and the like, electric door speakers, telephones, entrance directories for buildings, radio sets for locating personnel, loud speaker installations, television door speakers; videophone installations, closed-circuit television sets for civil and industrial use, distribution channels for hospitals, microswitches, limit switches, electro-safety valves, electronic components; namely, transistors, resistances, capacitors and printed circuits