Ri4Power Rated insulation voltage Ui Standard reference chapter 5.2.3 to IEC 61 439-1 Withstand voltage (root-mean-square value) specified for A smaller rated value may be specified for the low-voltage a piece of operating equipment or part of the low-voltage switchgear or a part thereof. It is important to ensure that all switchgear indicating the specified withstand capacity of operating equipment connected to the circuit meets this the affected isolator to IEC 61 439-1 section 3.8.8.3. rated value and that this rated value is greater than or equal The maximum possible rated value with the Ri4Power n and the rated operating voltage Ueto the rated voltage U of this circuit. system is 1000 V AC. Rated surge voltage resistance Uimp Standard reference chapter 5.2.4 to IEC 61 439-1 Withstand surge voltage indicating the isolator’s ability to A smaller rated value may be specified. Measures must withstand a transient overvoltage to IEC 61 439-1 section be taken to ensure that the surge voltage resistance of all 3.8.8.4. operating equipment connected to the circuit is greater than or equal to the transient overvoltage that may arise in this The maximum possible rated value with the Ri4Power system is 8 kV. system. Rated current of switchgear assemblies InA Standard reference chapter 5.3.1 to IEC 61 439-1 The rated current of switchgear assemblies is the current Dimensioning to a lower rated voltage is possible by select- that is fed into a low-voltage switchgear via one infeed or ing smaller bubar systems. several parallel infeeds and is distributed via the main bus- bar system. Note: The rated current of a busbar system in a switchgear may No maximum possible value is specified for the Ri4Power be smaller than the rated current of a switchgear, provided system, since the breakdown into multiple busbar sections measures are taken to ensure that the maximum admissible and the associated addition of busbar currents allows a current is not exceeded at any point in the busbar. For exam- multiple of the admissible currents to be achieved for the ple, this is possible with a centre infeed or several infeeds system current. distributed over the low-voltage switchgear. Rated current of circuits Inc Standard reference chapter 5.3.1 to IEC 61 439-1 The rated current of a circuit is the value which may be The maximum admissible rated currents of a circuit, with due routed via this circuit, while adhering to all overtempera- regard for the device types and device systems of the differ- tures. The rated currents of the devices used in this circuit ent switchgear brands and the protection category achieved, may well have higher values. For each circuit, the rated are detailed in the tables from page 77. currents must be defined by the user. By selecting suitable devices, the switchgear manufacturer must ensure that these are capable of carrying the requisite rated current Inc under the conditions in the switchgear. Rated diversity factor RDF Standard reference chapter 5.3.3 to IEC 61 439-1 The rated diversity factor is the factor with which the outgo- The rated diversity factor refers to the rated currents of the ing feeders of a low-voltage switchgear may be continuously circuits, and not to the rated currents of the switchgear. and simultaneously operated, with due regard for reciprocal In Ri4Power, this rated diversity factor depends on the thermal influences. This factor may be given for groups system design. Further details may be found in the descrip- of circuits as well as for the entire low-voltage switchgear tions of the switchgear field types. system. Rittal Technical System Catalogue/Power distribution 2 - 38
Technical System Catalogue Ri4Power
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