The purpose of this guide is to assist the power equipment operator in evaluating askarels in transformers, reactors and accessory equipment operated at power frequencies and in his efforts to maintain askarels in serviceable condition. It recommends standardized tests and evaluation procedures. Methods are outlined for reconditioning and reclaiming askarels whenever necessary. Precautions are also outlined for the disposal of unserviceable askarels in order to prevent environmental pollution. Local regulations should be followed.