IEC 60437 describes to measure, but it generally does not set the pass/fail limit . The limits are usually defined by the:
The standard provides limit values. For example: "The radio interference voltage shall not exceed 250 µV at 1.0 MHz under dry conditions at the specified test voltage." (Note: Exact values depend on the insulator's rated line voltage – refer to the PDF table).
It defines the test circuit, the measuring equipment required, and the methods for interpreting the results to ensure that interference levels remain within acceptable limits. Core Technical Requirements in the PDF