Dual wiring system

A dual wiring system comprising:

• a plurality of base units adapted to be mounted in plural positions of
• at least one wall surface of a building structure, and connected to both of an electric power line and a separate information line installed in said building structure;
• a plurality of function units each configured to provide at least one of functions of supplying electric power from said electric power line, outputting information from said information line, and inputting information into said information line when connected to said electric power line and said information line through one of said base units;
• and
• a control unit detachably connected to one of said function units or one of said base units, and configured to control at least two of said function units connected to said electric power line and said information line through said base unit(s),
• wherein said control unit and one of said base units or one of said function units have a pair of a module port and a module connector, which are detachably connected to each other to simultaneously establish both of an electric power transmission therebetween and a signal transmission therebetween;
• and
• wherein one of said module connector and said module port is formed at a side of said control unit such that said control unit is detachably connected to one of said base units or one of said function units in a direction along said wall surface.