Conductive liquids that are or may become accessible in normal use and conductive liquids that are in contact with unearthed accessible metal parts shall not be in direct contact with live parts. Electrodes shall not be used for heating liquids.For class II construction, conductive liquids that are or may become accessible in normal use and conductive liquids that are in contact with unearthed accessible metal parts shall not be in direct contact with basic insulation or reinforced insulation unless the reinforced insulation consists of at least 3 layers.For class II construction, conductive liquids which are in contact with live parts shall not be in direct contact with reinforced insulation unless the reinforced insulation consists of at least 3 layers.An air layer shall not be used as basic insulation or supplementary insulation in a double insulation system if it is likely to be bridged by leaking liquid.Compliance is checked by inspection.