www.se.com50Simplified design guide Design of a power distribution line in Canalis busbar trunkingCABDEF4 Choice of canalis trunking corresponding to in operating5 Temperature derating - Calculation of iz: permissible current in trunking6 Derating according to installation method7 Overload protectionBy calculating "In" operating you can determine "In trunking" and hence the trunking to be installed.Select the trunking for which the "In trunking" is directly greater than "In operating".Canalis trunkings are designed to operate in an ambient temperature of 35°C.Above this temperature, the trunking should be derated as per the following table.Canalis KS trunking is designed to be installed edgewise. However, it can also be mounted flat WITHOUT derating.To allow extensions at any time, the prefabricated trunkings are generally protectedat nominal current "In trunking" (or at permissible current Iz if the K1 factor is applied according to the ambient temperature).Depending on the type of protective device adopted, determine the standardisednominal current "In protection" of the overload protection device such that:Choose the equal or immediately lower standardised rating In (protection).Fuses: the typical ratings are given following the series of characteristic numbers of the "Renard" series.Example: 40 - 50 - 63 - 80 - 100 - 125 - 160 - 200, etcCircuit breakers: the typical ratings found at Schneider Electric are, for example:10 - 16 - 20 - 25 - 32 - 40 - 50 - 63 - 80 - 100 - 125 - 160 - 250 - 400 - 630, etc.Finally, confirm the following condition: In standardised protection ≥ In operating.If this is not the case, choose the immediately larger trunking and adjustthe calculations.Example: Canalis KNA 63 A at 45°C: Iz = In trunking x K1 = 63 x 0.94 = 59.22 A.Check that Iz > In operating and check the actual reserve. If necessary, select the next larger trunking.Table 1Total operating current In (A)Trunking40KNA4063KNA63100KNA100 or KSA100160KNA160 or KSA160250KSA250400KSA400500KSA500630KSA630800KSA8001000KSA1000Permissible current according to ambient temperatureIzAmbient temperature< 353540455055K1 factorNone10.970.940.910.87In protection ≤ Iz/K2K2: Factor specific to the type of protective deviceProtection by circuit breaker: K2 = 1Protection by gG/gl fuses: K2 = 1.1DEBU020EN
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