Modular outgoing feeder section

Technical System Catalogue Ri4Power

Ri4Power Modular outgoing feeder section Selection and installation of moulded-case circuit-breakers (MCCB) The following parameters must be known for the selection With the choice of unit and other mechanical parameters, of MCCBs: this produces the minimum size of the enclosure/compart- The rated current of the circuit Inc which the MCCB must ment for installation of the MCCB. This information can like- carry under the chosen conditions wise be found in Tables 35 – 40, see page 80 – 87. For The rated diversity factor RDF for this outgoing feeder enclosures with internal form separation, the minimum com- or the system partment size is derived from the rated voltage of the circuit. The protection category of the enclosure and type of Testing has verified that moulded-case circuit-breakers from cooling ABB, Eaton, General Electric, Mitsubishi, Schneider Electric, The design of the MCCB: Siemens and Terasaki may be used. The information pro- Rack-mounted, plug-in or static installation The number of poles in the MCCB (with switched or vided in Tables 35 – 40, see page 80 – 87, applies to the choice of connection cross-sections. If Rittal has not made unswitched neutral conductor) any particular stipulations regarding the required clearance The make and model of the MCCB at the sides, above and below the CBs, the equipment The rated voltage of the circuit manufacturer’s specifications should be observed. The required breaking capacity of the MCCB. A detailed diagram showing connection options for MCCBs With the rated current, the protection category and type of cooling, together with the make and model of the circuit- can be found in the valid Ri4Power assembly instructions. breaker, you can calculate the required unit size from Tables 35 – 40, see page 80 – 87. Selection and installation of switchgear units The following parameters must be known for the selection The switchgear must correspond to the connected equip- of switchgear units: ment as per their switching category. The rated current Inc The rated current of the circuit Inc which the switchgear unit of the chosen switchgear enclosure must not exceed 80% of must carry under the chosen conditions the rated current of the switchgear. The switching capacity of The rated diversity factor RDF for this outgoing feeder the switchgear must be greater than or equal to the on-state or the system values of the corresponding protective device. The connection The protection category of the enclosure and type of cable of the switchgear to the terminal connection must cooling be one cross-sectional size greater than that designed The design of the switchgear unit for a purely thermal current load as per Appendix H of (direct starter, stardelta starter, reversing starter) IEC 61 439-1. The make and model of the switchgear unit The connection clamps must be designed for the inner and The rated voltage of the circuit outer wiring of the switchgear unit. The required breaking capacity of the protective device. Testing has verified that switchgear and protective gear from Testing has verified that switchgear units from ABB, Eaton, General Electric, Mitsubishi, Schneider Electric, Siemens and ABB, Eaton, General Electric, Mitsubishi, Schneider Electric Terasaki may be used. If Rittal has not made any particular and Siemens may be used. If Rittal has not made any par- ticular stipulations regarding the required clearance at the stipulations regarding the required clearance at the sides, above and below the switchgear, the equipment manufac- sides, above and below the switchgear and protective gear, the equipment manufacturer’s specifications should be turer’s specifications should be observed. The choice of unit is specific to each brand. observed. A detailed diagram showing connection options for switch- Switchgear units: The protective device for a switchgear unit should be selected gear and protective gear can be found in the valid Ri4Power as follows in order to comply with testing requirements: assembly instructions. The rated current Inc of the chosen switchgear enclosure must not exceed 80% of the rated current of the protective gear. The breaking capacity of the protective device must be greater than or equal to the possible short-circuit current at the connection point. The connection cable of the switchgear to the superordinate busbar system must be 2 cross-sectional sizes greater than that designed for a purely thermal current load as per Appendix H of IEC 61 439-1. The choice of cables and laying conditions must be designed as short circuit-pro- tected wiring in accordance with IEC 61 439-1 (cf. also Table 14, page 62). Insulation of the connection cables between the protective device and the superordinate busbar system and the other devices in the main circuit must with- stand an overtemperature of 70 K. Rittal Technical System Catalogue/Power distribution 2 - 52


Technical System Catalogue Ri4Power
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