Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019 103
Specifying a New Controller Chapter 6
Pollution Degree Definition
For the purpose of evaluating creepage distances and clearances, the following
four degrees of pollution in the micro-environment are established:
• Pollution Degree 1: No pollution or only dry pollution occurs. The
pollution has no influence.
• Pollution Degree 2: Only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation is to be
expected.
• Pollution Degree 3: Conductive pollution occurs or dry non-conductive
pollution occurs which becomes conductive due to condensation which
is to be expected.
• Pollution Degree 4: Continuous conductivity occurs due to conductive
dust, rain or other wet conditions.
Enclosure Requirements for a Hazardous Environment - Class I,
Division 2, Groups A, B, C and D
The enclosure must comply with the following UL requirements.
WARNING: Special Conditions for Safe Use
• Models 9110: The ambient temperature range is -25 °C to +60 °C (-13 °F
to +140 °F).
• All other Models: the ambient temperature range is -25 °C to +70 °C (-13
°F to +158 °F).
• Subject devices are to be installed in an ATEX/IECEx Certified, IP54, tool
accessible enclosure that has been evaluated to the requirements of EN
60079-0: 2012 + A11:2013, EN 60079-15: 2010/ IEC 60079 -0 Ed 6 and
IEC 60079-15 Ed 4. Enclosure is to be marked with the following:
"Warning - Do not open when energized". After installation of subject
devices into the enclosure, access to termination compartments shall be
dimensioned so that conductors can be readily connected. Grounding
conductor should have a minimum cross sectional area of 3.31 mm²
• Subject devices are for use in an area of not more than pollution degree 2
in accordance with IEC 60664-1.
• Subject devices are to use conductors with a minimum conductor
temperature rating of 85 °C.
• Subject devices are to be installed in the vertical orientation only.
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