IEC 61010-1 standard allows to determine the maximum temperature levels by measuring the temperature rise under reference test conditions and adding this rise to 40°C or to the maximum rated ambient temperature if higher. Non-metallic enclosures have similar heat transfer characteristics to painted metallic enclosures, so the graph can be used. . ace values of 111 W/ft2 are possible. An examination of Weather Bureau data indicates that maximum ambient air temperatures of 104 ̊F (40 ̊C) are only exceeded in Arizona, Nevada and California (ref. A flammable liquid or gas shall not be utilized as. .
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