SINAMICS S120 Cabinet ModulesEngineering InformationSINAMICS Engineering Manual – November 2015Ó Siemens AG388/528The required cable cross-section depends on the amperage which flows through the cable. The permissible currentloading of cables is defined, for example, in IEC 60364-5-52. It depends on ambient conditions such as thetemperature, but also on the routing method. An important factor to consider is whether cables are routed singly andare therefore relatively well ventilated, or whether groups of cables are routed together. In the latter instance, thecables are much less well ventilated and might therefore heat one another to a greater degree. For the relevantcorrection factors applicable to these boundary conditions, please refer to IEC 60364-5-52. The table below providesa guide to the recommended cross-sections (based on IEC 60364-5-52) for PVC-insulated, 3-wire copper andaluminum cables, a permissible conductor temperature of 70°C (e.g. Protodur NYY or NYCWY) and an ambienttemperature of 40°C.Cross-sectionof3-wire cable[mm2]Copper cable Aluminum cableSingle routing[A]Groups of cablesrouted in parallel 1)[A]Single routing[A]Groups of cablesrouted in paralle l1)[A]3 x 2.5 22 17 17 133 x 4.0 30 23 23 183 x 6.0 37 29 29 223 x 10 52 41 40 313 x 16 70 54 53 413 x 25 88 69 68 533 x 35 110 86 84 653 x 50 133 104 102 793 x 70 171 133 131 1023 x 95 207 162 159 1243 x 120 240 187 184 1443 x 150 278 216 213 1663 x 185 317 247 244 1903 x 240 374 292 287 2241) Maximum 9 cables routed horizontally in direct contact with one another on a cable rackCurrent-carrying capacity of PVC-insulated, 3-wire copper and aluminum cables with a maximum permissible conductortemperature of 70°C at an ambient temperature of 40°C according to IEC 60364-5-52With higher currents, cables must be connected in parallel.The maximum connectable cable cross-sections for the line connection on the Line Connection Modules and for themotor connection on the Motor Modules are stated in the technical data in Catalog D21.3. The recommended cablecross-sections for the motor connection are identical to those for the SINAMICS S150 converter cabinet units, whichcan be found in section "Cable cross-sections and connections on SINAMICS S150 cabinet units" in chapter"Converter Cabinet Units SINAMICS S150".Note:The recommendations for the North American market in AWG or MCM must be taken from the appropriate NEC(National Electrical Code)/CEC (Canadian Electrical Code) standards.The PE conductor must be dimensioned to meet the following requirements:· In the case of a ground fault, no impermissibly high contact voltages resulting from voltage drops on the PEconductor caused by the ground fault current may occur (< 50 V AC or < 120 V DC, IEC 61 800-5-1, IEC 60 364,IEC 60 543).· The protective conductor must not be excessively loaded by any ground fault current it carries.· If it is possible for continuous currents to flow through the PE conductor when a fault occurs, the PE conductorcross-section must be dimensioned for this continuous current.· The PE conductor cross-section should be selected according to EN 60 204-1, EN 60 439-1, IEC 60 364.Cross-section of the phaseconductormm2Minimum cross-section of the external PE conductormm2Up to 16 Minimum phase conductor cross-section16 to 35 1635 and above Minimum half the phase conductor cross-section
