AB Quality 1794-IB16 Installation Instructions Manual page 14

14 24V dc FLEX I/O 16 Sink Input Module
Observe the following additional Zone 2 certification requirements:
IMPORTANT
This equipment is not resistant to sunlight or other sources of UV
radiation.
The secondary of a current transformer shall not be open-circuited.
The marking ALCR" is to be considered as applicable" to
individual products.
Equipment of lesser Enclosure Type Rating must be installed in an
enclosure providing at least IP54 protection when applied in Class
I, Zone 2 environments.
This equipment must be powered by energy limited associated
equipment as defined in EN 50021 when applied in Class I, Zone 2
environments.
Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 40% when
applied in Class I, Zone 2 environments.
Publication 1794 IN072C-EN-P - October 2001