1 Scope

1.1 These requirements cover a test method using alternating voltages 600 – 900 V under wet and contaminated conditions for the determination of the electrical surface tracking performance of solid insulating materials intended for use in transportation applications.

1.2 This method is an accelerated test which provides a ranked comparison of the performance of insulating materials. The results are not related directly to the suitable operating voltage in service. The performance characteristics of a material determined by this Test Method are not to be assumed to correlate with its performance in the end-use application. The actual response of materials depends upon the end-use design and application of the product using the material. Tests conducted on a material under the conditions specified are intended to provide information when comparing the relative performance characteristics of different materials, or assessing any change in performance characteristics prior to or during use.

1.3 The complete principles of insulation coordination involve the consideration of the combination of clearances, creepage distances, and the properties of solid insulation used to constitute the insulation system. Users of these results will also need to consider the overvoltage levels and the methods of control which will be utilized as well as establish the pollution degree to which the product insulation system will be expected to be subjected.

1.4 This Test Method does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this Test Method to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.