Ri4Power General remarks and recommendations Making busbar connections and To clean contact points and remove oxidation or mechanical connections to copper busbars contamination, we recommend use of a nonwoven fabric or similar. In the case of contamination from coolants or similar, When making connections to busbar systems or intercon- an alcohol-based detergent should be used. All screw con- necting copper busbar systems, extra care should be taken nections of connection points should be tightened with the when working on contact points. requisite torque. Information on the requisite torques may be The copper components supplied by Rittal may be used taken from the valid Ri4Power assembly instructions. If no directly. It is important to check that the copper components additional information is provided by Rittal regarding the do not have any contamination caused by dust, heavy oxi- installation of third-party devices, the manufacturers’ specifi- dation or contaminants such as coolant residues before cations should be observed. installing in the switchgear. If there is contamination, the component or contact point must be cleaned. Choice of internal connections If insulated cables are used to connect the main circuits, The correct dimensioning and engagement of the connec- these should be chosen for temperature resistance up to tions is particularly important for correct functioning of the 105 °C. This results from an ambient temperature of 35 °C switchgear enclosure. The switchgear manufacturer must and a maximum admissible overtemperature of 70 K at the follow the original manufacturer’s specifications. Installation device connections of the equipment. and assembly must always be carried out in compliance with the assembly instructions. As a general rule, the torques and dimensions specified in the assembly instructions for the Ri4Power system should be observed. If there are no special instructions on the installation or connection of a device given in the Ri4Power assembly instructions, the device manufacturer’s assembly instructions must be observed. Air circuit-breakers (ACB) The dimensioning of the busbar cross-sections and the For air circuit-breakers, the choice of connection material is number of busbars to be used may be taken from limited to copper bar version “half hard (HB)”. The use of Tables 29 – 34, page 77 – 79. However, Rittal recommends laminated copper bars to connect ACBs within the Ri4Power that you use the latest version of its Power Engineering system is not admissible. software, which automatically calculates the corresponding cross-sections for all admissible switches. Moulded-case circuit-breakers (MCCB) Furthermore, for devices greater than 100 A and for busbar For connecting MCCBs, the information given in Tables connection, conductor materials should be designed with 35 – 40, page 80 – 87 of this handbook should be used as the a 105 °C temperature-resistant insulation. When using 80% minimum cross-section. The prescribed conductor types may current load of the the device current, the connected con- be used, such as round conductors, laminated copper bars ductors must be designed for the maximum current of the or solid copper bars, as per the switchgear manufacturer’s devices. For devices below 100 A rated current, conductors specifications. When using Rittal circuit-breaker adaptors, with a temperature resistance of 90 °C may be used. the corresponding Rittal connection brackets should be used. 2 - 59 Rittal Technical System Catalogue/Power distribution
Technical System Catalogue Ri4Power
To see the actual publication please follow the link above