en/ACS800-04/U4 Hardware Manuals - VAE ProSys sro

51Selecting the power cablesGeneral rulesDimension the mains (input power) and motor cables according to localregulations:• The cable must be able to carry the drive load current. See chapter Technicaldata for the rated currents.• The cable must be rated for at least 70 °C maximum permissible temperature ofconductor in continuous use. For US, see section Additional US requirements.• The inductance and impedance of the PE conductor/cable (grounding wire) mustbe rated according to permissible touch voltage appearing under fault conditions(so that the fault point voltage will not rise excessively when a ground faultoccurs).• 600 V AC cable is accepted for up to 500 V AC. 750 V AC cable is accepted forup to 600 V AC. For 690 V AC rated equipment, the rated voltage between theconductors of the cable should be minimum 1 kV.For drive frame size R5 and larger, or motors larger than 30 kW (40 HP),symmetrical shielded motor cable must be used (figure below). A four-conductorsystem can be used up to frame size R4 with up to 30 kW (40 HP) motors, butshielded symmetrical motor cable is always recommended. The shield(s) of motorcable(s) must have 360° bonding at both ends.Note: When continuous metal conduit is employed, shielded cable is not required.The conduit must have bonding at both ends as with cable shield.A four-conductor system is allowed for input cabling, but shielded symmetrical cableis recommended. To operate as a protective conductor, the shield conductivity mustbe as follows when the protective conductor is made of the same metal as the phaseconductors:Cross-sectional area of the phaseconductorsS (mm 2 )S < 16Minimum cross-sectional area of the correspondingprotective conductorS p (mm 2 )S16 < S < 35 1635 < S S/2Compared to a four-conductor system, the use of symmetrical shielded cablereduces electromagnetic emission of the whole drive system as well as the stress onmotor insulation, bearing currents and wear.The motor cable and its PE pigtail (twisted shield) should be kept as short aspossible in order to reduce high frequency electromagnetic emission, as well asstray currents outside the cable and capacitive current (relevant in power rangebelow 20 kW).Planning the electrical installation