Ri4Power Neutral conductors – Requirements General In Ri4Power section types, the following additional require- Dimensioning of the neutral conductor is described in ments should be observed for the neutral conductor: IEC 61 439-1, chapter 8.6. The following minimum require- ACB air circuit-breaker sections ments apply to the neutral conductor in 3-phase circuits. When using a switched neutral conductor or a 4th pole In circuits with a phase conductor cross-section up to and routed with the phase conductors, this is assembled in including 16 mm2 , the neutral conductor must correspond exactly the same way as a regular 4-pole ACB section. to 100% of the corresponding phase conductors. If the fourth pole is not switched, the neutral conductor rises In circuits with a phase conductor cross-section of more parallel to the phases via stacking insulators. than 16 mm², the neutral conductor must correspond to If the anticipated current in the neutral conductor is greater 50% of the corresponding phase conductors, but at least than 50%, the neutral conductor should be dimensioned 16 mm2. in the phase conductor cross-section of the connection kit. The current in the neutral conductor is assumed to be no If the neutral conductor current is less than 50%, the more than 50% of a phase conductor current. The dimen- cross-section may be halved. If the neutral conductor sioning of the neutral conductor should be agreed in is not switched, the cross section may be designed to advance with the end client. IEC 61 439-1. Explanation of the neutral conductor Modular outgoing feeder section In systems that simultaneously have ohmic, capacitive If a 4-pole distribution busbar system is used, the enclosure and inductive loads on the phase conductors, more than width must be at least 600 mm. 100% load of the neutral conductor is possible. NH slimline fuse-switch disconnector section Neutral conductor in the main busbar system When using 4-pole NH slimline fuse-switch disconnectors Assembly of the main busbar system in a 4-pole version from ABB (Slimline) or Jean Müller (Sasil), the neutral con- is dependent on the type of bar system used, the network ductor should be routed in the main conductor cross-sec- configuration, the enclosure dimensions and the busbar tion. The busbar support is unable to accommodate different arrangement. busbar designs, compared with the phase conductors. If the neutral conductor is routed in the cable outgoing feeder If the neutral conductor is to be routed separately, this can be achieved with the busbars (with RiLine60, Maxi-PLS and section, this should be designed in accordance with stand- Flat-PLS) in 600 mm and 800 mm deep enclosures. ard IEC 61 439-2. If the neutral conductor is to be routed together with the Cable outgoing feeder section phase conductors, the enclosures for Flat-PLS 100 and No particular requirements. Maxi-PLS 3200 should have a depth of at least 800 mm. Neutral conductors for switchgear All other bar systems may be installed in 600 mm deep Neutral conductors for 4-pole switchgear that have not enclosures as a 4-pole busbar assembly. already been described in this chapter must be dimen- The chosen network configuration (TN-C, TN-CS, ...), sioned and connected in accordance with the original device manufacturer’s specifications. If there is no clear definition see page 42, defines the design of the neutral conductor. given in the original device manufacturer’s specifications, the neutral conductor should be dimensioned in conformity with the general rules of this chapter and Annex H of IEC 61 439-1. 2 - 63 Rittal Technical System Catalogue/Power distribution
Technical System Catalogue Ri4Power
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