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LV Induction Motors - EN 01/2019     Omega Motor


      3. DEGREES OF PROTECTION


      IEC 60034-5 defines the degrees of protection provided by enclosures for rotating electrical machines.

      EXAMPLE OF DESIGNATION
                                                           IP         X          X


      Characteristic letters (International Protection)
      First characteristic numeral
      Second characteristic numeral


                    Degree of
          Motor     protection                     First Numeral                           Second Numeral
                                Protection against contact   Protection against foreign bodies   Protection against water
                                                                                     Protected against jets. Water
                      IP55                               Dust protected.             projected  by a nozzle against
                                                                                     the motor from any direction
                                                         Ingress of dust is not totally   shall not do any harmful effect.
                                                         prevented but dust can  not
                                                         enter in sufficient quantity to
         Surface               Complete protection against   interfere with satisfactory   Protected against water from
                                                         operation of the motors
        Ventilated    IP56     contact with live or moving                           heavy seas.
                               parts
                                                         Dust tight.
                      IP65                               Ingress of dust is totally   Water projected by a nozzle
                                                                                     from any direction.
                                                         prevented



       4. COOLING METHOD


       Brief information on the cooling methods, specified in IEC 60034-6, is given below.

                                                                        IC      4     (A)*    1     (A)*    1
       - Code letters (International Cooling)
       - Cooling circuit arrangement
              4: Frame surface cooled
       - Movement method of primary coolant
              1: Air circulation inside the motor
       - Movement method of secondary coolant
              0: Free convection via frame surface, without fan
              1: With the fan on the motor shaft (NDE side) via frame surface
              6: With an independent fan from the motor shat (forced cooling)
              8: Cooling with driven fan by the motor itself

       * (A): This letter indicates the surrounding medium (A for air. W for water). For air cooled motors, A is omitted for simpler designation.



















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