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The Required Glow Wire Test Temperature for Internal Parts of Insulating Material for power transformers, power supplies,reactors and similar products

Jan 11, 2021

According to IEC 61558 clause 27.3.2 , internal parts of insulating materials retaining (keeping in position) current carrying parts in position shall be resistant to ignition and spread of fire.

Compliance is checked by subjecting the parts of insulating materials to the glow wire tester with the temperature of the glow wire as follows:

– 550 °C for internal insulating material not retaining (not keeping in position) current carrying parts in position


– 650 °C for coil formers (bobbins)



– 650 °C for parts retaining (keeping in position) current carrying parts in position and terminals for external conductors which carry a current up to 0,2 A during normal operation



– 750 °C for parts retaining (keeping in position) current carrying parts in position and terminals for external conductors with fixed connection (e.g., soldering) which carry a current exceeding 0,2 A during normal operation



– 850 °C for parts retaining (keeping in position) current carrying parts in position and terminals for external conductors with non fixed connection which carry a current exceeding 0,2 A during normal operation



The Glow Wire Tester ZLT-GTR produced by Zhilitong Electromechanical Co., Ltd , can carry out glow wire test at temperature of 550 °C, 650 °C,750 °C and 850 °C.


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