Prefabricated connector systems and prefabricated system components for electrical installation applications used in connection with building services systems, the prefabricated system components comprising switching devices, EIB switching devices, actuators, coding switches, switch connections, EIB M modules and EIB M2 modules, expansion modules, extension modules, EIB tool software, mounting rails, cables, flat cables, distribution boards, sub-distribution boards, junction boxes, terminal b...