MODULAR LIGHTING SYSTEMS 21

The flangeless channel section is used for flush-mounting inplasterboard ceilings. This version requires a mounting frame as a sub-base in addition to the actual channel section: the mounting frames are first placed in the prepared ceiling cut- out and fixed to the ceiling. The weight of the LIGHTTOOLS unit is transferred to the structural (load-bearing) ceiling by steel cords. The channel sections are not fitted in the ceiling opening and locked in the mounting frame until the assembly joints have been plastered over. The through-wiring is then fit- ted, and the power supply (if applicable, a building manage- ment system as well) is then connected. The channel structure (channel section and mounting frame) iscut to the desired length on site. The appropriate number of standard lengths (1,600 mm) is calculated according to site requirements. Finally, they are blanked off by a 3-part blank section and a blank mounting frame which are cut to length on site. In some cases a shorter 800 mm section is required instead of a single 1,600 mm standard section (see page 16). The connectors for the channel sections and mounting frames are included in the scope of supply with the sections and do not have to be ordered separately. The same applies to the end plates. They need only be ordered as an extra set if no blank sections are used.