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Flex I/O inside Class II, Div 2 Area

Flex I/O inside Class II, Div 2 Area

Flex I/O inside Class II, Div 2 Area

Hello everyone!

This is my first post ever. I would like to know if Allen-Bradley Flex I/O Ethernet module and input card can be installed inside a Type 4 (NEMA 4) enclosure for Class II, Div 2 Group G (Powdered sugar @ 370 deg C, Wheat Flour @ 360 deg C)? It is for Canada, however I wouldn't mind your perspective from NEC side and I can compare it to CEC/OESC.

The Flex I/O Ethernet adapter is a heat producing equipment T4A - 120 deg. C (Model 1794-AENT) but it is only rated for non-hazardous or Class I, Div 2 locations
The Flex I/O Digital Input module is a heat producing equipment T3C - 160 deg. C (Model 1794-IB16XOB16P) but it is only rated for non-hazardous or Class I, Div 2 locations.


RE: Flex I/O inside Class II, Div 2 Area

While I've only worked in Class I environments, it seems as long as your enclosure is rated for Class II your Class I electronics should be okay (not a very definitive answer). I wonder if NEMA 4 is adequate for powdered sugar and wheat flour, or if you need NEMA 6.

I expect your answers are in IEC 60079-0 and 60079-31, or check with a consultant.


RE: Flex I/O inside Class II, Div 2 Area

Thanks Zappedagain,

The Canadian Electrical Code does allow the following for Class II, Div 2:

J18-256 Switches, controllers, circuit breakers, and fuses, Class II, Division 2
Enclosures for switches, motor controllers, circuit breakers, and fuses, including push buttons, relays, and similar devices, shall be either an Enclosure Type 4 or 5, or
(a) be provided with telescoping or close-fitting covers or with other effective means to prevent the escape of sparks or burning material; and
(b) have no openings, such as holes for attachment screws, through which, after installation, sparks or burning material might escape, or through which exterior accumulations of dust or adjacent combustible material might be ignited.

RE: Flex I/O inside Class II, Div 2 Area

Verify if Type 4 is adequate for powdered sugar and wheat flour, or if you need Type 5.


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