Ri4Power Switchgear installation types This applies to the installation of switchgear in the middle The switchgear should always be installed horizontally. of the room, back against the wall, side panels without con- vection, and the option of baying other enclosure panels. Rittal switchgear may be positioned back to back or directly against the wall without derating the busbar systems and switchgear. This is based on the tests and test results. All switchgear is insulated at the rear, as well as the side panels. Conductor cross-section in relation Examples of conductors, selected and installed according to short-circuit withstand capacity to the table below, with an SCPD (short-circuit protection (unprotected active conductors) The conductor cross-section should be dimensioned suchdevice) on the load side, must not exceed a length of 3 m. Standard reference IEC 61 439-1 that, firstly, the rated current can be carried and secondly, Active conductors in switchgear enclosures that are not pro- if there is a short-circuit, the conductor will not overheat tected by short-circuit protection devices (see IEC 61 439, inadmissibly until the downstream protection device is deacti- chapters 8.6.1 and 8.6.2) must be selected and laid through- vated (cf. also VDE 0298 Part 4: 2003-08). out their entire route in the switchgear enclosure to prevent the likelihood of short-circuits between the phase conduc- tors or between the phase conductors and earthed parts. Table 14: Conductor selection and laying conditions (IEC 61 439, chapter 8.6.4) Type of conductor Requirements Uncoated conductor or single-wire conductor with basic insulation Mutual contact or contact with conductive parts must be prevented, e.g. to IEC 60 227-3 e.g. via the use of spacer supports Single-wire conductors with basic insulation and an admissible Mutual contact or contact with conductive parts is admissible without operating temperature of the conductor of at least 90 °C, e.g. cables the external influence of pressure. to IEC 60 245-3 or heat-resistant thermoplastic (PVC)-insulated Contact with sharp edges is to be avoided. cables to IEC 60 227-3 These conductors must only be loaded in such a way that an operating temperature of 80% of the maximum admissible operating temperature on the conductor is not exceeded. Conductors with basic insulation, e.g. cables to IEC 60 227-3 with an additional second insulation, such as cables with an individual shrink sleeve or cables laid individually in plastic tubes Conductors insulated with a material of very high mechanical strength, such as ethylene-tetrafluoroethylene (ETFE) insulation, No additional requirements or double-insulated conductors with a reinforced outer coating, dimensioned for use up to 3 kV, e.g. cables to IEC 60 502 Single- or multi-wire light plastic-sheathed cables, e.g. cables to IEC 60 245-4 or IEC 60 227-4 Cable routing or cable entry The requisite bending radii of the cables used should also The corresponding preparations stipulated by or agreed with be taken into account. Adequate cable clamp rails should the manufacturer of the low-voltage switchgear enclosure be provided to secure them. Adequate quantities of terminal should be made with regard to cable entry and attachment. connections should be provided for all cables. Rittal Technical System Catalogue/Power distribution 62
Technical System Catalogue Ri4Power
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