I have this question for anyone Please,
I am referring from a UL standard chart for materials group tables related
to the CTI performance level category values of insulation materials that
are specified in the Standard for Polymetric Materials - Short Term Property
Evaluations, Ul 746A, to be included in the groups with a range of CTI
values (eg. CTI >= 600 {PLC=0}, - 400< CTI < 600 {PLC =1 }, 175 <= CTI < 400
{PLC = 2 or 3}, 100 <= CTI < 175 {PLC =4}).
Note: PLC stands for Performance Level Category, and CTI stands for
Comparative Tracking Index.

Does anyone use this or require certain board material with CTI rating in
order to achieve certain accepatble creepage distances especially when using
higher voltages?



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