Robin, You do not scale the thickness as such when increasing the voltage rating. Insulation Thickness is directly related to the degree of Mechanical protection that needs to be achieved. Insulation thickness is only "partially" (brain stoppage for lack of a better word!) related to voltage rating. UL generally requires a higher degree of mechanical protection for insulation (and wire insulation) as the voltage rating increases. In addition, voltage tests (such as Dielectric strength, Insulation Resistance, and such) apply and require higher values as the desired voltage rating is increased. Typically, many Insulation materials will not be required to increase their minimum thickness requirements above 600 Volts values, as long as all test requirements are met. I recommend you discuss your nomex options and thickness limitations with your NRTL and/or your Nomex supplier. You can reach me directly if you wish, as well. Hope this helps, Regards, Bob Tims Compliance Engineer Ericsson Messaging Systems Inc. robert.t...@ericsson.com
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