Article 505 Temperature Ratings

[danhunter54]

What determines the temperature rating of equipment. Is it the autoignition temperature of the atmosphere? I am trying to determine what T rating is required for an atmosphere that could contain methane.

Any help is appreciated.

danhunter54

 

[rbalex]

Subsection 505.9(D) explains "T classification" and its application with Zone rated equipment. Subsection 505.9(D)(1) indicates how the T-classification is generally determined. Division rated equipment is similar, but not identical.

Since methane has an auto ignition temperature of 630C, it has a T1 classification in either classification method.

?Temperature rating? has a different meaning and is generally a reference to the ambient that the equipment is permitted to operate in without derating it.

 

[danhunter54]

Section 505 Temperature Ratings

Section 505 Temperature Ratings

Thanks Bob.

danhunter54