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About The Screening Test Of Tracking Test Apparatus

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According to IEC60112 clause 12.2,if the behaviour of the material is unknown,a screening test shall start with at least three specimens at a maximum starting voltage of 300V with a minimum of 50 drops.If the material withstands the initial test without tracking failure and without a persistent flame,always using three specimens,increase the test voltage by 100V steps until a tracking failure or a persistent flame occurs.Then reduce the test voltage by 50V,and finally increase or reduce the test voltage by 25V to identify the maximum test voltage for the determination of the comparative tracking index.If the material fails at the initial test voltage,reduce the test voltage by 100 V and follow the same iterative procedure for the determination of the comparative tracking index,always using three specimens.


This procedure is necessary because some materials can withstand high test voltages,but fails at lower test voltages.


ZLT Tracking Test Apparatus,the test voltage can be adjusted,is high quality Tracking Test Apparatus.


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