Guidelines for planning the electrical installation 77 Requirements tableThe following table shows how to select the motor insulation system and when a du/dtfilter, common mode filters and insulated N-end (non-drive end) motor bearings arerequired. Ignoring the requirements or improper installation may shorten motor life ordamage the motor bearings and voids the warranty.MotortypeNominal ACsupply voltageRequirement forMotorinsulationsystemABB du/dt and common mode filters, insulated N-endmotor bearingsPN < 100 kWand framesize <IEC 315100 kW < PN < 350 kWorIEC 315 < frame size <IEC 400PN > 350 kWorframe size >IEC 400PN < 134 hpand framesize <NEMA 500134 hp < PN < 469 hporNEMA 500 < framesize < NEMA 580PN > 469 hporframe size >NEMA 580ABB motorsRandom-woundM2_,M3_ andM4_UN < 500 V Standard - + N + N + CMF500 V < UN < 600 V Standard + du/dt + N + du/dt + N + du/dt + CMForReinforced - + N + N + CMF600 V < UN < 690 V(cable length <150 m)Reinforced + du/dt + N + du/dt + N + du/dt + CMF600 V < UN < 690 V(cable length >150 m)Reinforced - + N + N + CMFForm-woundHX_ andAM_380 V < UN < 690 V Standard n.a. + N + CMF PN < 500 kW:+N + CMFPN > 500 kW+N + du/dt + CMFOld*form-woundHX_ andmodular380 V < UN < 690 V Check withthe motormanufacturer.+ N + du/dt with voltages over 500 V + CMFRandom-woundHX_ andAM_ **0 V < UN < 500 V Enamelledwire with fiberglass taping+ N + CMF500 V < UN < 690 V + N + du/dt + CMFHDP Consult the motor manufacturer.* manufactured before 1.1.1998** For motors manufactured before 1.1.1998, check for additional instructions with the motor manufacturer.
