Insulating resistance and insulation compressive strength of electric heating tube performance, Source: People's Republic of China Machinery Industry Standard JB/T2379-2016 "Metal Tubular Electric Heating Element"
5.3.4 Insulation resistance:
The cold insulation resistance should not be less than 50MΩ during factory inspection
The insulation resistance after sealing test, long-term storage or use is not less than 1MΩ
The thermal insulation resistance at operating temperature should not be less than the calculated value of equation (2), but the minimum should not be less than 1MΩ
Formula: R---- thermal insulation resistance in megaohms (MΩ)
t---- heating length in millimeters (mm)
T---- Operating temperature in degrees Celsius (°C)
5.3.5 Insulation compressive strength:
The components should be kept for 1min under the specified test conditions and test voltage without flashover and breakdown phenomenon
