INSULATION FOR ELECTRIC CONDUCTORS, ELECTRICAL INSULATION FOR CONDUCTORS IN ELECTRICAL MACHINES, ELECTRICAL APPARATUS AND OTHER ELECTRICAL EQUIPMENT; ELECTRICAL INSULATION COMPRISING A WRAPPING OR BANDAGE OF AN INSULATING MATERIAL AROUND CONDUCTORS IN ELECTRICAL MACHINES, ELECTRICAL APPARATUS AND OTHER ELECTRICAL EQUIPMENT, THE WRAPPING OR BANDAGE BEING IMPREGNATED WITH AN IMPREGNATING RESIN