This specification applies to the rating and testing of on-load tap-changers for power transformers. It is confined to matters affecting the on-load tap-changer itslef independently of any transformer to which it may be connected. Auxiliary equipment is not included in this specification.
Methods of test for vitreous enamel coatings, Method 2.1: Physical tests - Determination of resistance of vitreous enamel coatings on metal substrates to thermal shock
