The air-insulated switchboards type W 38.5 consist of type-tested panels, which are separated each from the other and provided with one single bus bar system. The design of the air-insulated switch panels corresponds to the specifications of the EN 60298 standard. The built-in instruments and apparatuses meet the requirements of the subject standards. The panels have been tested for resistance to accidental arc to VDE 0670, part 6 and appendix A (the PEHLA tests), eqv. EN 60298 at 16 kA / 1 sec. The earthing switches feature short-circuit making capacity and they are provided with interlocking. The welded frame structure and the supporting parts of the switchboard are provided with two layers of varnish. The switchboard panel is designed as one single MV space, which can be further equipped with a small terminal box. The front side of the panel is equipped with two-wing steel sheet doors with central lock and inspection window made of multilayer glued safety glass. The front part bears the corresponding mimic diagram. The bus bar space is covered with fixed and screwed covers. Both the doors and the bus bar covers, as standard, are supplied with the RAL 7032 (grey) colour dye. From the rear part all the panels are covered with 2 mm galvanized sheets. From the left side is each panel equipped with PE 5 mm insulation plate stiffened with glass fibres and provided with bushings. The complete panel separation at the bus bar area can be supplied on request. From the upper side the panels are covered with screwed-on steel sheets. The cable compartment remains opened.