Comparative Tracking Index (CTI) - UL 746 Test Standard Explained
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Comparative Tracking Index (CTI) - UL 746The voltage which causes tracking after 50 drops of 0.1% ammonium chloride solution have fallen on the material. The results of testing at 3 mm thickness are considered representative of the material's performance in any thickness. Tracking is an electrical breakdown on the surface of an insulating material. A large voltage difference gradually creates a conductive leakage path across the surface of the material by forming a carbonized track. Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.
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