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Code IP55T4,IIC or IP55T3,IIC

Code IP55T4,IIC or IP55T3,IIC

Code IP55T4,IIC or IP55T3,IIC

The protect Class (Anti explosion Class) is IP55T4, IIC.  Or IP55T3, IIC, It is FENC find from technical safety documents.
This is a project I'm working on I know the T3 and T4 are for temperature and IIC is for class but the IP55 I need help with some documentation to spec controls.

RE: Code IP55T4,IIC or IP55T3,IIC

Currently the standard is IEC 60529 for Ingress Protection.

Within the USA perhaps one could call IIC a material zone group.  See NFPA 497 table 4.4.2 for the cross reference between groups A, B, C, D etc. with the zone groups IIC, IIB, and IIA.  Flammable and combustible liquids include Class Identification with Roman numberals much like those above but none of the liquid classes that I see include IIC.  This gets more confusing.  Pick ethanol and find that it is NEC group D, type I and zone IIA.  The type and Class I zone groups include Roman numerals.  The notes indicate that type designates whether the ematerial is a gas, flammable liquid or combustible liquid.  The Class I Zone groups in this table are based upon 1996 IEC TR3 60079-20.

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