CT secondary loop test effects on primary side

Hello friends, I am new in this field.
Just wondering when we do the CT loop test (injecting for example AC 1A or 5A with minimum voltage at CT secondary) for measuring voltage drop at every points of CT secondary downstream side what would happen in the Primary side? Is it safe the Primary side considering a huge current with mV? Should I need to take a safety precaution to test this?

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