... spaceNO5:Checkerboard layout, arbitrary, easy maintenance.Ease of trunking for wiring board can be opened without opening the floorNO6 ... the problem about original cement, brick, wood floors wires embedded, the long-term use of lines caused by aging, ... short circuit, accidents and other worries and troublesNO8:it's for large offices, computer rooms, intelligent buildings, securities hall, government ...