The electrical connections may only be carried out by a certi ed electrician in compliance with the guidelines of the local power supply company and applicable legal regulations (e.g. VDE norms for Germany). In general, there may be only one permanent connection line to the network. Furthermore equipment should be provided that makes it possible to disconnect the system on all phases from the power supply with a contact gap of minimum 3 mm. All electrical installations and all connection lines that are installed inside the sauna cabin must be suitable for an ambient temperature of at least 170 °C. The power supply line shall be laid to the control unit and connected to the power input terminals.