BECKHOFF EL1904 - Manual (Page 30)

Operation
28 EL1904
4.2 Operation in potentially explosive atmospheres (ATEX)
4.2.1 Special conditions
WARNING
Observe the special conditions for the intended use of Beckhoff fieldbus
components in potentially explosive areas (directive 94/9/EU)!
 The certified components are to be installed in a suitable housing that
guarantees a protection class of at least IP54 in accordance with EN 60529!
The environmental conditions during use are thereby to be taken into account!
 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 of 0 to 55 °C when using
Beckhoff fieldbus components in potentially explosive atmospheres!
 Measures must be taken to protect against the rated operating voltage being
exceeded by more than 40% due to short-term interference voltages!
 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!
 The fuses of the KL92xx feed terminals may only be exchanged 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 fundamental health and safety requirements are fulfilled by compliance with the following standards:
 EN 60079-0: 2006
 EN 60079-15: 2005