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Whether different Class CT's can be used for Sepam 64REF protection.

CT requirement for any application depends on some factors knee-point voltage accuracy-limit factor 

64REF can be of Low Impedance type & High Impedance type 

1) 64 REF-Low Impedance - Phase CT & Neutral CT can be of different class.For Example : Class X for Neutral CT & Class 5P10 for Phase CT ; 
Different Class CT's can be used subject to they should fulfill the values of Knee point voltage & other recommended parameters. 

2) 64 REF-High Impedance - CT's of Different Class type should not be used.
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