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Mounting and wiring
3.8.2
IECEx - Special conditions
Observe the special conditions for the intended use of Beckhoff fieldbus components in
potentially explosive areas!
• For gas: The equipment shall be installed in a suitable enclosure providing a degree of protection of IP54
according to IEC 60079-15, taking into account the environmental conditions under which the equipment
is used!
• For dust (only the fieldbus components of certificate no. IECEx DEK 16.0078X Issue 3):
The equipment shall be installed in a suitable enclosure providing a degree of protection of IP54
according to EN 60079-31 for group IIIA or IIIB and IP6X for group IIIC, taking into account the
environmental conditions under which the equipment is used!
• The equipment shall only be used in an area of at least pollution degree 2, as defined in IEC 60664-1!
• Provisions shall be made to prevent the rated voltage from being exceeded by transient disturbances of
more than 119 V!
• If the temperatures during rated operation are higher than 70°C at the feed-in points of cables, lines or
pipes, or higher than 80°C at the wire branching points, then cables must be selected whose
temperature data correspond to the actual measured temperature values!
• Observe the permissible ambient temperature range for the use of Beckhoff fieldbus components in
potentially explosive areas!
• The individual terminals may only be unplugged or removed from the Bus Terminal system if the supply
voltage has been switched off or if a non-explosive atmosphere is ensured!
• The connections of the certified components may only be connected or disconnected if the supply
voltage has been switched off or if a non-explosive atmosphere is ensured!
• Address selectors and ID switches may only be adjusted if the supply voltage has been switched off or if
a non-explosive atmosphere is ensured!
• The front hatch of certified units may only be opened if the supply voltage has been switched off or a
non-explosive atmosphere is ensured!
Standards
The fundamental health and safety requirements are fulfilled by compliance with the following standards:
• EN 60079-0:2011
• EN 60079-15:2010
• EN 60079-31:2013 (only for certificate no. IECEx DEK 16.0078X Issue 3)
Marking
Beckhoff fieldbus components that are certified in accordance with IECEx for use in areas subject to an
explosion hazard bear the following markings:
Marking for fieldbus components of certificate
no. IECEx DEK 16.0078X Issue 3:
Marking for fieldbus components of
certficates with later issues:
28
WARNING
IECEx DEK 16.0078 X
Ex nA IIC T4 Gc
Ex tc IIIC T135°C Dc
IECEx DEK 16.0078 X
Ex nA IIC T4 Gc
Version: 3.4.0
EL6631-0010
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