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Why does ASTM E1725 consider a failure to occur when the average test temperatures exceed 139°C? It seems to me that the majority of low temperature cables have a maximum operating temperature of 90°C or 105°C?

Everything (including existing IS circuits )is located in a Class 1 Division 2 location.

Thanks for your replies. They were helpful, but did not address my specific situation. Let me explain... My co-workers seem to think it is common practice to mix intrinsically safe and non-incendive cables (without following the requirements in section 504.30). They simply reclassify the...

I am looking for a standard which outlines how the ratings for intrinsically safe circuits and non-incendive circuits are effected when the field wiring for both types of circuits are routed together in the same cable tray without any separation or metal-sheathed cables.