Hello group, I've been studying IEC 60664-4, "Insulation coordination for equipment within low-voltage systems - Part 4: Consideration of high-frequency stress." My intent is to determine reasonable safety spacings for air gaps, insulators and thin film insulators at high frequencies. So far, the standard does not seem to be very helpful. It presents limited empirical data on a selection of insulating materials but really does not offer any practical application, in general. In addition, it appears there is no information for frequencies above 100 MHz. I am interested in characterizing a number of material types and factor in frequencies up to 300 MHz and higher. Is there anyone in this group that can help me understand how to use this standard and how it was intended to work with the product safety standards that reference the IEC 60664-X series? I am also interested in any independent / public material characteristic data that may be available on the subject. My best regards, -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA
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