Tüv Nord Ex-I Applications - WAGO 750-370 Manual

6.2.2 TÜV Nord Ex-i applications
For operation in zone 2, the WAGO-I/O-System 750-*** must be mounted in
an enclosure that fulfills the requirements of the directive 94/9/EG and the
relevant standards EN 60079-0 and EN 60079-15. The fulfillment of these
requirements must be certified by an appointed office.
Only devices that are suitable for operation in areas subject to explosion of
zone 2 and 22 and that are suitable for the conditions in the place of
installation (declaration of conformity or certificate from a test office) may be
connected to not intrinsically safe circuits in zone 2 or zone 22.
If the interface circuits are operated without the 750-3 fieldbus coupler ../....-...
(DEMKO 08 ATEX 142851 X), then measures must be taken outside of the
device so that the rated voltage will not be exceeded by more than 40 % due to
temporary faults.
The connection and interruption of non intrinsically-safe circuits under
voltage is only permissible during installation, maintenance or for repair
purposes. The simultaneous occurrence of explosive atmosphere and
installation, maintenance, etc. must be ruled out.
For operation in zone 22, the WAGO-I/O-System 750-*** must be mounted
in an enclosure that fulfills the requirements of the directive 94/9/EG and the
relevant standards EN 61241-0 and EN 61241-1. The fulfillment of these
requirements must be certified by an appointed office. The housing must be
marked on the outside with
II 3 (1) GD Ex nA tD [ia] [iaD] IIC/IIB A22 IP6X T135°C (T4) and/ or
II 3 (2) GD Ex nA tD [ib] [ibD] IIC/IIB A22 IP6X T135°C (T4).
The marking must take into account all devices built into the enclosure.
The manufacturer of the whole device must ensure that taking into account the
maximum ambient temperature range, the temperature in the enclosure will
not drop below 0 °C or exceed 55 °C.
DIP switches, coding switches, and potentiometers that are connected to the
module may only be operated if an explosive atmosphere can be ruled out.
WAGO-I/O-SYSTEM 750
PROFINET IO
Use in Hazardous Environments
Installation Regulations
• 251