50www.se.comDesign guideSelect the short-circuit protectionDetermining the prospective short-circuit current at the origin of the CanalisThere are two possible situations: bthe busbar trunking for lighting is supplied by a secondary switchboard. Isc(a): rms short-circuit current across the transformer terminals.Rms Isc (a) values across the transformer terminals (U = 400 V)Power (kVA)50100150200250315400500630800100012501600Isc(a) (kA)1.83.65.77.28.911.214.217.622.124.827.831.536.7Isc(b): downstream short-circuit current, less than Isc(a), limited by cable impedance.Isc(c): short-circuit current across circuit-breaker terminals, less than Isc(b), limited by circuit breaker.Isc(d): prospective short-circuit current, limited by cable impedance (case 1) or by impedance of cable + Canalis (case 2).Isc(e): prospective short-circuit current, at head of Canalis by the circuit breaker (d) and the impedance of the Canalis supply cable.Drawn from the Ecodial low-voltage installation-calculation software, produced by Schneider Electric for fast and precise evaluation of prospective short-circuit currents at different points in the circuit.Please consult your regional sales office.Canalis and protection coordinationDrawn from tests specified in standards (used in our guides and software), the table below determines the type of circuit breaker or fuse required for a particular type of busbar trunking depending on the prospective short-circuit current at the head of the Canalis trunking.Type of busbar trunkingCircuit-breaker protectionFuse protectionIsc (d) (Prospective Isc)Prospective Isc10 kA15 kA20 kA25 kA50 kA50 kA25 A KBA, 25 A KBBiC60N25iC60H25iC60L25iC60L25NC100LH2520 A gG40 A KBA, 40 A KBBiC60N40iC60H40iC60L40iC60L40NC100LH4032 A gGCharacteristics of Canalis busbar trunkingType of busbar trunkingShort-circuit withstandPermissible thermal stress for 0.1 s y t y 3 sRated peak short-circuit current(kA)(A2S)25 A KBA4.419.5 x 10440 A KBA9.690 x 10425 A KBB4.419.5 x 10440 A KBB9.690 x 104CableCableCanalis KBA or KBBCanalis KN or KSCanalis
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