WAGO 750 Series Manual page 233

Danger
When using the WAGO-I/O SYSTEM 750 (electrical operation) with Ex
approval, the following points are mandatory:
The field bus independent I/O System Modules Type 750-xxx are to be
installed in enclosures that provide for the degree of ingress protection of at
least IP54.
For use in the presence of combustible dust, the above mentioned modules
are to be installed in enclosures that provide for the degree of ingress
protection of at least IP64.
The field bus independent I/O system may only be installed in hazardous
areas (Europe: Group II, Zone 2 or America: Class I, Division 2, Group A, B,
C, D) or in non-hazardous areas!
Installation, connection, addition, removal or replacement of modules, field
bus connectors or fuses may only take place when the system supply and the
field supply are switched off, or when the area is known to be non-hazardous.
Ensure that only approved modules of the electrical operating type will be
used. The Substitution or Replacement of modules can jeopardize the
suitability of the system in hazardous environments!
Operation of intrinsically safe EEx i modules with direct connection to
sensors/actuators in hazardous areas of Zone 0 + 1 and Division 1 type
requires the use of a 24 V DC Power Supply EEx i module!
DIP switches and potentiometers are only to be adjusted when the area is
known to be non-hazardous.
Further Information
Proof of certification is available on request.
Also take note of the information given on the module technical information
sheet.
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
Use in Hazardous Environments • 229
Installation Regulations