46Technical data EHB 1112.4 Notes regarding class ratingClass ratingThe class rating according to DIN EN 61140 specifies the safety measures forelectrical equipment to avoid electrocution. There are four class ratings:Class rating Meaning0 No special protection apart from the basic insulation.No grounded conductor.Plug connection without grounded conductor contact.I Connection of all conductive housing components to thegrounded conductor.Plug connection with grounded conductor contact.II Reinforced or double insulation (protective insulation).No connection to the grounded conductor.Plug connection without grounded conductor contact.III Equipment is operated on protective low voltage(< 50 V).Connection to the grounded conductor is not necessary.Plug connection without grounded conductor contact.