nord NORDAC START Series, User Manual

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2 Assembly and installation
BU 0135 en-4118 51
2.4.2 Operation in potentially explosive environments - EAC Ex
All of the conditions which must be observed for operation of the frequency inverter in an explosion
hazard 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 be Deviations which are relevant for approval accordi
complied 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 X
IP66:
Ex tc IIIC T125 °C Dc X
The following applies for motor mounted devices;
IP55:
Ex tc IIIB Dc U
IP66:
Ex tc IIIC Dc U
Categorisation:
• Protection with "housing"
• Procedure "A" Zone "22" Category 3D
• Protection class IP55 / IP66 (depending on
the device)

IP66 is required for conductive dust
• Maximum surface temperature 125 °C
• Ambient temperature -20 °C to +40 °C
Information
Code "U"
Code "U" applies for frequency inverters which are intended for motor mounting. Devices which are so labelled
are considered to be incomplete and may only be operated in combination with a corresponding motor. If a
device which is coded "U" is mounted in a motor, the labels and restrictions which are marked on the motor or the
geared motor also apply.
Information
Code "X"
The code "X" indicates that the permissible ambient temperature range is between -20°C and +40°C