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What is the maximum current for current transformer LT6CT8001 (ration 800:1) & can we use it for 820 Amps for example?

As per the standard IEC 60185, you can use this CT of ratio 800:1 up to additional 20% continuously under normal service conditions.
Moreover, as per the accuracy class 5P as well as precision limit factor 15, this means that it can maintain accuracy up to accuracy limit factor which is 800*15, you can use the transformer of 800:1 with 820 Amps for your application.
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