Keba 99.839 Triangle Stele for 2 Wallbox Stainless Steel. Legal Regulations Notice: Please observe the applicable legal regulations for the installation, connection, and operation of charging devices. The installation and commissioning (connection) of the charging station may only be carried out by a qualified company that is registered in an installer directory of a network operator (see § 13 Low Voltage Connection Ordinance). This means that only those registered as installation companies are permitted to carry out this work. Private individuals cannot perform these activities, regardless of their professional qualifications.