2 Assembly and installationBU 0135 en-4118 512.4.2 Operation in potentially explosive environments - EAC ExAll of the conditions which must be observed for operation of the frequency inverter in an explosionhazard environment according to EAC Ex are listed below. All of the conditions according to Section 2.4.1 "Operation in potentially explosive environments - ATEX zone 22 3D "apply .ng to EAC EX are described below and must beDeviations which are relevant for approval accordicomplied with.2.4.2.1 Modification of the device Section 2.4.1.1 "Modification of the device for compliance with Category 3D"applies.The labelling of the device according to EAC Ex differs as follows.Labelling of the device:The following applies for wall mounted devices;IP55: Ex tc IIIB T125 °C Dc XIP66: Ex tc IIIC T125 °C Dc XThe following applies for motor mounted devices;IP55: Ex tc IIIB Dc UIP66: Ex tc IIIC Dc UCategorisation:• Protection with "housing"• Procedure "A" Zone "22" Category 3D• Protection class IP55 / IP66 (depending onthe device)IP66 is required for conductive dust• Maximum surface temperature 125 °C• Ambient temperature -20 °C to +40 °CInformation Code "U"Code "U" applies for frequency inverters which are intended for motor mounting. Devices which are so labelledare considered to be incomplete and may only be operated in combination with a corresponding motor. If adevice which is coded "U" is mounted in a motor, the labels and restrictions which are marked on the motor or thegeared motor also apply.Information Code "X"The code "X" indicates that the permissible ambient temperature range is between -20°C and +40°C
