scope:

Describes two test methods for the evaluation of electrical insulating materials for use under severe ambient conditions at power frequencies (48 to 62 hz) by measurement of the resistance to cracking and erosion, using a liquid contaminant and inclined plane specimens. Method 1: constant tracking voltage, method 2: stepwise increase of test voltage. Two criteria for determining the endpoint are in use. Criterion A: The endpoint is reached, when the current through the specimen exceeds 60 mA. Criterion B: The endpoint is reached, when the value of the track reaches a mark on the specimen surface 25 mm from the lower electrode. Criterion A is preferred.