CESI the Italian accredited lab tested the Bergoz Instrumentation IPCT (Industrial DCCT derived from NPCT beam instrument) with >100 kA (!) discharge. IPCT survived and recovered in 40ms.
TechIMP of Bologna installed >100 IPCTs at the TenneT-operated Randstad North- and South Rings HV lines to measure surge arrester leakage up to 20mA with 0.1% resolution.