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Busbars anddistribution12Power guide 2009 / book 12

Distribution and standards . . . . . . . . . . . . . . . . . . . . . . . . 02INTROStatutory conditions for the protection of branchor distributed lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 04Protection and control of operating circuits are the basicfunctions of a distribution panel. But upstream thereis another function, possibly more discreet, but justas essential: distribution.Sizing busbars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 06Determining the usable cross-section of the bars . . . . . . . . . . . . . . . . 06Checking the permissible thermal stress . . . . . . . . . . . . . . . . . . . . . . . 12Determining the distances between supports . . . . . . . . . . . . . . . . . . . .13Even more than for the protection and control functions, the selectionand setup of distribution equipment require an approach that combinesselection of products (number of outputs, cross-sections, conductor types,connection method) and checking the operating conditions (current-carryingcapacity, short circuits, isolation, etc.) in multiple configurations.Depending on the power installed, distribution is carried out via distributionblocks (up to 400 A) or via busbars (250 A to 4000 A). The former mustbe selected according to their characteristics (see page 32), while thelatter must be carefully calculated and sized according to requirements(see page 06).Magnetic effects associated with busbars . . . . . . . . . . . . . . . . . . . . . . 20Checking the insulation characteristics . . . . . . . . . . . . . . . . . . . . . . . . 23Shaping and connecting bars . . . . . . . . . . . . . . . . . . . . . . 26Rigid bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Flexible bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Current transformers (CT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Distribution blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Characteristics of distribution blocks . . . . . . . . . . . . . . . . . . . . . . . . . . 33Phase balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Legrand distribution blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Choice of products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46In accordance with its policy of continuous improvement, the Company reserves the right to change specificationsand designs without notice. All illustrations, descriptions, dimensions and weights in this catalogue are for guidanceand cannot be held binding on the Company.1

BusBars and distriButionDistributionand standardsDistribution can be defined as supplyingpower to a number of physically separateand individually protected circuits froma single circuit.If it were applied to the letter, this rule would leadto over-sizing of cross-sections for fault conditions.The standard therefore allows for there to be noprotection device at the origin of the branch linesubject to two conditions.IUpstream protectiondeviceDownstream protectiondevicesI3DISTRIBUTION AND STANDARDS02S1P1 protects S1P2 protects S2There is no reduction incross-section before P2P2S2 S1S1S2 S1P2P1S1L 3mS2 S1P2I4Depending on the circuits to be supplied, distributionwill be via busbars (flat or C-section copper oraluminium bars, see p. 06), via prefabricated distribution blocks (power distribution blocks, modulardistribution blocks, distribution terminal blocks,see p. 32) or via simple supply busbars. Accordingto the standards, a device providing protection againstshort circuits and overloads must be placed at thepoint where a change of cross-section, type, installation method or composition leads to a reductionin the current-carrying capacity (IEC 60364-4-43). Main busbar at the top of the enclosurewith 2 copper bars per poleP1P1Multi-level distributionThis layout can be used for example when several distributionblocks (2nd level) are suppliedfrom a single busbar (1st level).If the sum of the currents tappedoff at the first level (I1, I2, etc.)is greater than It, a protectiondevice P2 must be provided on S2. Branch busbar in cable sleeve:C-section aluminium barsP1ItS11st levelP2I1Conductorcross-sections:s3 s2s2 s1 ModulardistributionblockP2I2S2S22nd levelS3P3I11I12I13I14 distribution via supply busbarsI21I22I23I24DISTRIBUTION AND STANDARDSI2 or the branch line S2is less than three metreslong, is not installednear any combustiblematerials and everyprecaution has beentaken to limit the risksof short circuits.There is no other tap-offor power socket on thebranch line S2 upstreamof protection P2.theoretical layoutDistributionI1Upstream device P1 effectively protects the branchline S2 03

Busbars and distributionDistributionand standards (continued)1 Summary of the generalSTATUTORY CONDITIONS FOR PROTECTING BRANCH OR DISTRIBUTED LINESFor insulated cables and conductors, the breakingtime of any current resulting from a short circuitoccurring at any point must not be longer than thetime taken for the temperature of the conductors toreach their permissible limit.This condition can be verified by checking that thethermal stress K²S² that the conductor can withstandis greater than the thermal stress (energy I²t) that theprotection device allows to pass.04conditions of the branch line(s)with regard to the thermalstressesFor branch lines with smaller cross-sections (S2 S1),check that the stress permitted by the branch line isactually greater than the energy limited by the maindevice P1. The permissible thermal stress valuesK²S² can be easily calculated using the k values givenin the table below:K values for conductorsConductor cross-sect. mm2PVCThermoplastic 300Initial temperature C 300PVCThermoplastic 90 C 30070EPR XLPEThermosettingRubber 60 CThermosettingMineral 30090906070105250200160250Final temperature C160140160Copper conductor11510310086143141115Aluminium conductor766866579493-135-115-Connections solderedwith tin solder for copperconductors115-------140K values 3mS2BP2BL1S2NMS1 corresponds to the cross-section of the mainconductor and S2 to the cross-section of the branchconductor.The maximum length of the branch conductorwith cross-section S2 that is protected against shortcircuits by protection device P1 placed at point A isrepresented by segment ON. It can be seen using thisrepresentation that the protected length of the branchline decreases the further away the tap-off point isfrom protection P1, up to the prohibition of any S2smaller cross-section tap-off at the apex of thetriangle, B.This method can be applied to short-circuit protection devices and those providing protection againstoverloads respectively, as long as device P2 effectivelyprotects line S2 and there is no other tap-off betweenpoints A and O.4 3 metre rule applied toType of insulation of the conductorProperty/ConditionOS1S2S1L2The short-circuit protection device P1 placed at theorigin A of the line can be considered to effectivelyprotect branch S2 as long as the length of the branchbusbar system S2 does not exceed a certain length,which can be calculated using the triangle rule.- The maximum length L1 of the conductor with crosssection S1 corresponds to the portion of the circuit ABthat is protected against short circuits by protectiondevice P1 placed at point A.- The maximum length L2 of the conductor with crosssection S2 corresponds to the portion of the circuit AMthat is protected against short circuits by protectiondevice P1 placed at point A.These maximum lengths correspond to the minimumshort circuit for which protection device P1 can operate(see Book 4).AP1P2P2Aconditions using the “trianglerule”S2NBP23 Checking the protection2 Checking the protectionOS2The maximum energy values limited by the devicesare given in the form of figures (for example 55,000 A²sfor modular devices with ratings up to 32 A or in theform of limitation curves (see Book 5).principle for checking thermalstressAP1overload protection devicesWhen protection device P1 placed at the head of line S1does not have any overload protection function or itscharacteristics are not compatible with the overloadprotection of the branch line S2 (very long circuits,significant reduction in cross-section), it is possibleto move device P2 up to 3 m from the origin (O) of thetap-off as long as there is no tap-off or power socketon this portion of busbar system and the risk of shortcircuit, fire and injury is reduced to the minimum forthis portion (use of reinforced insulation conductors,sheathing, separation from hot and damaging parts).P1AS1O2O3O4S2S3S4B2B3B4P2P3P45 Exemption from protectionagainst overloadsThe diagram above illustrates three examples oftap-offs (S1, S2, S3) where it is possible not to provideany overload protection or simply not to check whetherthis condition is met.- Busbar system S2 is effectively protected againstoverloads by P1 and the busbar system does not haveany tap-offs or power sockets upstream of P2- Busbar system S3 is not likely to have overload currents travelling over it and the busbar system does nothave any tap-offs or power sockets upstream of P3– Busbar system S4 is intended for communication,control, signalling and similar type functions and thebusbar system does not have any tap-offs or powersockets upstream of P4.STATUTORY CONDITIONS FOR PROTECTING BRANCH OR DISTRIBUTED LINESSTATUTORY CONDITIONS FOR PROTECTINGBRANCH OR DISTRIBUTED LINES05

BusBars and distriButionSizingbusbarsThe busbar constitutes the real “backbone”of any distribution assembly. The main busbarand branch busbars supply and distributethe energy.1 C-SECTION ALUmINIUm BARS (supports Cat. Nos. 373 66/67/68/69)They are used for busbars up to 1600 A, or 3200 Aby doubling the supports and the bars.The electrical and mechanical characteristics ofLegrand busbar supports, and strict compliance withthe maximum installation distances, ensure isolationbetween the poles and that the bars can resistthe electrodynamic forces.DETERmINING THE USABLE CROSS-SECTION OF THE BARSDETERMINING THE USABLE CROSS-SECTION OF THE BARSThe required cross-section of the bars is determinedaccording to the operating current, the protectionindex of the enclosure and after checking the shortcircuit thermal stress.The currents are named in accordance with thedefinitions in standard IEC 60947-1 applied to theusual operating conditions for a temperature rise Atof the bars which does not exceed 65 C.06Currents accordingto standard iEC 60947-1 Ie: rated operating current to be taken intoconsideration in enclosures with natural ventilationor in panels with IP 30 protection index (ambientinternal temperature 25 C). Ithe: thermal current in enclosure correspondingto the most severe installation conditions. Sealedenclosures do not allow natural air change, as the IPprotection index is greater than 30 (ambient internaltemperature 50 C).Parallel bars temperature rise testfor a 3 x 120 x 10 perpole busbar on supportCat. no. 374 54The current-carrying capacity in n bars is less thann times the current-carrying capacity in one bar.Use n 1.6 to 1.8 for a group of 2 bars, n 2.2 to 2.4for 3 bars and n 2.7 to 2.9 for 4 bars.The wider the bars, the more coefficient n is affected,the more difficult they are to cool and the higherthe mutual inductance effects.The permissible current density is not thereforeconstant: it is approximately 3 A/mm2 for small barsand falls to 1 A/mm2 for groups of large bars. supports Cat. nos.373 66/67: with alignedbars supports Cat. nos.373 68/69: with steppedbarsC-section aluminium barsIe (A) IP 30Ithe (A) IP 30Cat. No.Cross-section (mm²)I²t (A²s)Icw1s (A)8006301 x 373 545242.2 x 10946,9005492.5 x10949,96010953,32510008001 x 373 55125010001 x 373 565862.8 x145012501 x 373 576863.9 x 10962,425175016001 x 373 588245.6 x 10974,9851010149,970350032002 x 373 582 x 8242.2 x2 RIGID COPPER BARS2.1. mounting bars edgewise on supports Cat. Nos. 373 10/15/20/21/22/23rigid flat copper bars - edgewise mountingle (A) IP 30Ithe (A) IP 30Cat. No.Dim. (mm)I2t (A2s)Icw1s (A)11080373 8812 x 21.2 x 1073430160200250125160200373 89374 33374 3412 x 415 x 418 x 44.7 x 1077.4 x 1071 x 1086865858010,295280250374 3825 x 42.1 x 10814,30010817,875330270374 1825 x 53.2 x450400374 1932 x 55.2 x 10822,900700630374 4050 x 51.1 x 10933,75011501000374 402 x (50 x 5)4.5 x 10967,500800700374 4163 x 51.8 x 10942,50013501150374 412 x (63 x 5)7.2 x 10985,500950850374 5975 x 52.5 x 10950,60015001300374 592 x (75 x 5)1 x 1010101,0001000900374 4380 x 52.9 x 10954,0001010108,00016501450374 432 x (80 x 5)12001050374 46100 x 51.2 x4.5 x 10967,50019001600374 462 x (100 x 5)1.8 x 1010135,000 stepped busbarin cable sleevewith supportsCat. no. 373 10DETERMINING THE USABLE CROSS-SECTION OF THE BARSBusbars can be created using copper or aluminiumbars. Flat copper bars are used for busbars up to4000 A with Legrand supports. They provide greatflexibility of use, but require machining on request(see p. 26). Legrand aluminium bars are made ofC-section rails. Connection is carried out withoutdrilling, using special hammer head screws.07

Busbars and distributionSizing busbars(continued)2.2. Mounting bars edgewise on supports Cat. Nos. 373 24/25 SupportsCat. No. 373 24 canbe used to create veryhigh current busbars:up to 4000 A in IP 55XL3 4000 enclosures Bars mounted edgewise in vertical or horizontal busbars:supports in horizontal position5mmm10 m Simply rotate the isolating supportsto take 5 or 10 mm thick barsDetermining the usable cross-section of the barsIe (A) IP 0305042005000Ithe (A) IP 5033003800Number1234123412341234123412341234Dim. (mm)50 x 550 x 550 x 550 x 563 x 563 x 563 x 563 x 575 x 575 x 575 x 575 x 580 x 580 x 580 x 580 x 5100 x 5100 x 5100 x 5100 x 5125 x 5125 x 5125 x 5125 x 5160 x 5(1)160 x 5(1)160 x 5(1)160 x 5(1)(1) Stainless steel threaded assembly rod, diameter 8 to be supplied separately and cut to length 1 to 3 bars, 10 mm thick, per poleRigid flat copper bars, 10 mm thickI2t (A2s)1091.14 x4.56 x 1091.03 x 10101.82 x 10101.81 x 1097.23 x 1091.63 x 10102.89 x 10102.56 x 1091.03 x 10102.31 x 10104.10 x 10112.92 x 1091.17 x 10102.62 x 10104.67 x 10104.56 x 1091.82 x 10104.10 x 10107.29 x 10107.12 x 1092.85 x 10106.41 x 10101.14 x 10111.17 x 10104.67 x 10101.05 x 10111.87 x 1011Icw1s (A)Ie (A) IP 30Ithe (A) IP 30NumberDim. (mm)I2t (A2s)Icw1s 53,125337,500108,000216,000324,000432,000950850150 x 104.56 x 10967,5001010135,000202,50016801470250 x 101.82 x23002030350 x 104.10 x 101011501020160 x 106.56 x 10981,00020301750260 x 102.62 x 1010162,00028002400360 x 105.90 x 1010243,00014601270180 x 101.17 x 1010108,0001010216,00025002150280 x 104.67 x34502900380 x 101.05 x 1011324,000175015001100 x 101.82 x 1010135,000305025502100 x 107.29 x 1010270,000415035003100 x 101.64 x 1011405,0001010162,000200017501120 x 102.62 x360029202120 x 101.05 x 1011324,000480040003120 x 102.63 x 1011486,000Positioning bars edgewise encourages heatdissipation and is much the best option. If thebars have to be positioned flatwise (with thesupports in a vertical position) the currentcarrying capacities must be reduced (see nextpage).Determining the usable cross-section of the barsRigid flat copper bars, 5 mm thick 1 to 4 bars, 5 mm thick, per pole09

Busbars and distributionSizing busbars(continued)2.3. Mounting bars flatwise on supports Cat. Nos. 373 24/25Rigid flat copper bars, 10 mm thick Bars mounted flatwise inhorizontal busbars: supportsin vertical positionDetermining the usable cross-section of the barsRigid flat copper bars, 5 mm thick10Ie (A) IP 30Ithe (A) IP 30NumberDim. (mm)I2t (A2s)Icw1s (A)500750100011204206309001000123450 x 550 x 550 x 550 x 51.14 x 1094.56 x 1091.03 x 10101.82 x 101033,75067,500101,250135,000109Ithe (A) IP 30NumberI2t (A2s)Dim. (mm)67,500880650150 x 104.56 x12501050250 x 101.82 x 1010135,00020001600350 x 104.10 x 1010202,5001000800160 x 106.56 x 10981,0001010162,00016001250260 x 102.62 x22501850360 x 105.90 x 1010243,0001010108,0001150950180 x 101.17 x17001500280 x 104.67 x 1010216,0001011324,00025002000380 x 101.05 x135011501100 x 101.82 x 1010135,000200016502100 x 107.29 x 1010270,0001011405,000290024003100 x 101.64 x165014501120 x 102.62 x 0001200123463 x 563 x 563 x 563 x 51.81 x7.23 x 1091.63 x 10102.89 x 011001400123475 x 575 x 575 x 575 x 52.56 x 1091.03 x 10102.31 x 10104.10 x 0011501450123480 x 580 x 580 x 580 x 52.92 x 1091.17 x 10102.62 x 10104.67 x 101054,000108,000162,000216,000Ie (A) IP 30Ithe (A) IP 30Cat. No.Dim. (mm)I2t (A2s)Icw1s (A)200160374 1013 x 32 x 10744858501200160019007001050140016501234100 x 5100 x 5100 x 5100 x 54.56 x 1091.82 x 10104.10 x 10107.29 x 101067,500135,000202,500270,000320200374 1620 x 48.5 x 1079200400250374 1124 x 4374 6720 x 51.2 x 10811,000470320374 1724 x 51.9 x 10813,800109630400374 1232 x 53.4 x 234125 x 5125 x 5125 x 5125 x 57.12 x2.85 x 10106.41 x 10101.14 x 1450180021501234160 x 5(1)160 x 5(1)160 x 5(1)160 x 5(1)1.17 x 10104.67 x 10101.05 x 10111.87 x 1011108,000216,000324,000432,000(1) Stainless steel threaded assembly rod, diameter 8, to be supplied separately and cut to lengthIcw1s (A)109250020002120 x 101.05 x350030003120 x 102.63 x 10113 Flexible copper barsFlexible copper bars700500374 4440 x 55.3 x850630374 5750 x 58.3 x 10828,70012501000374 5850 x 103.3 x 10957,5001010115,000250020002 x 374 582 x (50 x 10)1.3 xDetermining the usable cross-section of the barsIe (A) IP 3011

Busbars and distributionSizing busbars(continued)Checking the permissible thermal stressThe thermal stress permitted by the bars must begreater than that limited by the protection device.The distance between the supports is determinedaccording to the electrodynamic stress generated bythe short circuit.The forces exerted between the bars during a shortcircuit are proportional to the peak value of the shortcircuit current.Curve showing thermal stress limitedby a DPX 250 ER (160 A)1010I 2t (A2s)1 Rms value of the prospective109short-circuit current (Ik)160The maximum thermal stress value I2t taken intoconsideration for a short-circuit current of less than5 s is calculated using the formula I²t K²S², where:- K 115 As0.5/mm² for flexible copper bars(max. temperature: 160 C)- K 135 As0.5/mm² for large cross-section rigidcopper bars (width greater than 50 mm;max. temperature: 200 C)- K 143 As0.5/mm² for small cross-section rigidcopper bars (width less than 50 mm) and C-sectionbars (max. temperature: 220 C)- K 91 As0.5/mm² for rigid aluminium bars(max. temperature: 200 C)- S bar cross-section in mm²108This is the prospective maximum value of the currentwhich would circulate during a short circuit if therewere no protection device. It depends on the type andpower of the source. The actual short-circuit currentwill generally be lower in view of the impedance ofthe busbar system. The calculation of the values tobe taken into account is described in Book 4: “Sizingconductors and selecting protection devices”.I2t of the bar107106Limited I2tChecking the permissible thermal stressThe limited peak current is determined from thecharacteristics of the protection device (see Book 5:“Breaking and protection devices”).It represents the maximum (peak) value limited bythis device. If there is no limiting protection device,the prospective peak value can be calculated from theprospective short-circuit current and an asymmetrycoefficient (see next page).INon-limitedprospective IpkProspective Ik105Prospective Ik104Prospectiverms IkLimited IpkThe conventional value of the short-time withstandcurrent with regard to thermal stress, in relationto a period of 1 s, is expressed by the formula:103Icw1s I²t102This is the rms value of the short-circuit currentthat would circulate if there were no protection device.Ik1: between phase and neutralIk2: between 2 phasesIk3: between 3 phasesThese values were formerly called Isc1, Isc2 and Isc3.Do not confuse Ik with Ipk, which is defined below. 122 Peak current value (Ipk)101Limited Ikt100100101102103104Ik (A)Example: using a 12 x 4 mm rigid flat bar for 160 Apermissible I2t of the bar: 4.7 x 107 A2sProspective rms Ik: 10 kA (104 A)The thermal stress limited by this device canthen be read by plotting the above value on thelimitation curve given for the protection device(in this case, a DPX 250 ER 160 A): 5 x 105 A2s,value less than the I2t permitted by the bar.105If in doubt or the actual prospective Ik valueis not known, use a value of at least 20 x In.The electrodynamic forces are proportional tothe square of the peak current. It is this valuewhich must be taken into consideration whendetermining the distances between the supports.Determining the distances between supportsCalculating the thermal stressDetermining the distances between supports13

Busbars and distributionSizing busbars(continued)Limiting protection deviceNon-limiting protection deviceThe limitation curves of the protection devices(DX and DPX) give the limited peak current accordingto the prospective short-circuit current (see Book 5“Breaking and protection devices”).The non-limited peak Ik curve corresponds to noprotection.When the busbar is protected by a non-limitingprotection device (for example DMX³), the maximumvalue of the peak current is developed during thefirst half-period of the short circuit. This is referredto as the asymmetric 1st peak.Valueof asymmetric1st peakIpk(kÂ)limited IpkNonlimitepkdIProspective IkILimitationcurveIk rms valueThe electrodynamic forces that are exerted betweenconductors, in particular in busbars, are the result of theinteraction of the magnetic fields produced by the currentflowing through them. These forces are proportional to thesquare of the peak current intensity that can be recordedin  or kÂ. When there is a short circuit, these forces canbecome considerable (several hundred daN) and causedeformation of the bars or breaking of the supports.The calculation of the forces, prior to the tests, is theresult of applying Laplace's law, which states that whena conductor through which a current i1 passes is placedin a magnetic field H with induction B, each individualelement dl of this conductor is subjected to a force ofdF idl B.If the magnetic field originates from another conductorthere is then anofthrough which i2 passes, interaction eachofthefieldsH1 and H2 and forces F1 and F2 generated by B1 and B2.The directions of the vectors are givenby Ampère's law.If currents i1 and i2 circulate in the samedirection, they attract, if they circulate inopposite directions, they repel. Schematic representation at a pointin space (Biot-Savart law)Timerms Ik (kA)14DeviceDPX 125Rating(A)Ipk (peak) max.(kÂ)16-2511.9DPX 12540-6315DPX 125100-12517DPX 1602514.3DPX 16040 to 16020DPX 250 ER100 to 25022DPX 25040 to 25027DPX-H 25040 to 250The calculation of the forces in the event of short circuits (Fmax), can be defined as follows:Ipk (peak) n x prospective rms IkProspective rms Ik(kA)nIk 51.51.710 Ik 2023420 Ik 502.150 Ik2.2DPX 630250 to 63034250 to 63042DPX 1600630 to 160085DPX-H 1600630 to 1600110IIDE: spacing between conductorsEDFmaxFmax 2 x 2I 2xxI 2Dxx 10x-810-8EED-8Fmax 2 x x x 10 with F in daN, I in A peak, and D and E in the same unit.ED DIn practice,thisFmax 2formulaxEI 2 xE Disxonly10-8applicable to very long (D 20 E) round conductors.DEWhenDisshorter,acorrection,called the “end factor” is applied:Ex -1D -1DFmax 2 x-82I 2xxI 2 Dx 10x-810-8- For 4Fmax D 220,use2 FmaxE EE 2 x DI x E x 10-8Fmax 2 x I x-1 x 10E2 x-8D 2 D 2 1 - 1 x-810-8 D2 x-12I 2xxxI10 1 - 1 x 10- For D F max4, use 2 xFmaxI22 FxmaxE EEEDFmax 2 x I 2 x 1 - 1 x 10-8ECorrection factors must be inserted in these formulae to take account of the layout and shapes -2 asD- a D 2 -8a a2of the Fconductorsround.Fmax 1 not-b 1 bx 10-8max 2 x2I xwhenxI x they-1 xare10s-aa a abE bEa bbs-aaD 2 1 - 1 x 10-8Fmax2 x I2 xa bbEI25 Ik 10DPX-H 630D: length of the conductor (distancebetween supports in the case of bars)The relationship between the peak value and the rmsvalue of the prospective short-circuit current isdefined by the coefficient of asymmetry n:(( ( ) ))(( )()() )( )( )( )Determining the distances between supportsDetermining the distances between supportsGeneral formula for calculating the forces in the event of a short circuitThe table below gives the limited peak value (Ipk)directly for the maximum prospective short-circuitvalue equal to the breaking capacity (Icu) of thedevice.For lower prospective short-circuit values, readingthe curves will provide an optimised value.15

Busbars and distributionSizing busbars(continued)3 Practical determination of the distances between the supportsMaximum distance D (in mm) between multipole supports Cat. Nos. 373 20/21 (E fixed: 75 mm)according to the peak current (Ipk)SupportsThe Ipk values to be taken into account mustbe determined according to the limitation curvesfor the devices (see p. 12)Ipk (peak)(in kÂ)Bars373 88 (12 x 2) or373 89 (12 x 4)E (mm)Ipk (peak)(in kÂ)374 37373 25200250300374 33 (15 x 4), 374 34 (18 x 4)or 374 38 (25 x the distances between supports Bars50 mm thickMaximum distance D (in mm)between single pole supports (E adjustable)3016373 20125Maximum distance D (in mm) between multipole supportsCat. Nos. 373 96, 374 10/15/32/36 (E fixed)Bars10152025303540455055607080374 32374 36374 41(63 x 00700600550500450400350300250250200200374 40(50 x 01 flat bar per pole374 41374 59(63 x 5)(75 x 0374 43(80 x 00Maximum distance D (in mm) for multipole supports Cat. Nos. 373 22/23 (E fixed: 75 mm)373 22/23 and 374 53Bars50 mm thick373 96373 211 C-section bar per poleSupportsSupportsIpk (peak)(in kÂ)10152025303540455060708090100110120374 18(25 x 5)8006004503503002502002001501251001 flat bar per pole374 19374 40(32 x 5)(50 x 200125150100150100374 15374 10373 88(12 x 2)373 89(12 x 4)374 33/34(15 x 4)(18 x 4)374 38(25 x 4)374 34(18 x 4)374 18(25 x 5)374 19(32 x 5)374 34(18 x 4)374 38(25 x 4)374 18(25 x 5)374 19(32 x 800700550400350300300200175150150Ipk (peak)(in kÂ)10152025303540455060708090100110120374 40(50 x 01 flat bar per pole374 41374 59374 43(63 x 5)(75 x 5)(80 x 0374 46(100 x 00374 40(50 x 5)2 flat bars per pole374 41374 59374 43(63 x 5)(75 x 5)(80 x 5)374 46(100 x 0350300300250200200550450400300300250200200 Determining the distances between supportsThe followingtables can beused to determinethe maximumdistances D (inDmm) between thesupports, basedon the requiredIpk value, and thus D'create busbars.EThe shorter thedistance between the supports,the higher the permissible Ik.With single pole supports, it is also possible to vary the spacing between bars E.The wider the spacing between bars, thehigher the permissible Ik.Distance D’ after the last support mustalways be less than 30% of distance D.17

Busbars and distributionSizing busbars(continued)Supports373 24, 373 25, 374 54BarsDeterminingthe distances between supports 18Ipk (peak)(in kÂ)Maximum distance (in mm) between multipole supportsCat. Nos. 373 24/25 with 10 mm thick bars1 bar per pole2 bars per pole3 bars per pole4 bars per pole50 x 5 63 x 5 75 x 5 100 x 5 125 x 5 50 x 5 63 x 5 75 x 5 100 x 5 125 x 5 50 x 5 63 x 5 75 x 5 100 x 5 125 x 5 50 x 5 63 x 5 75 x 5 100 x 5 125 x 580 x 580 x 580 x 580 x 510 1550 1700 1700 1700 1700 1700 1700 1700 1700 170015 1050 1200 1350 1550 1700 1550 1700 1700 1700 1700 170020 800 900 1000 1150 1350 1200 1350 1500 1700 1700 1550 1700 170025 650 750800 950 1100 950 1100 1200 1400 1550 1250 1450 160030 550 600700 800 900 800 900 1000 1150 1300 1050 1200 135035 450 550600 650 800 700 800 900 1000 1150 900 1050 115040 400 450550 600 700 600 700 800 900 1000 800 900 105045 350 400450 550 600 550 600 700 800 900700 800 90050 350 350450 500 550 500 550 650 700 800650 750 85060 300 300350 400 450 400 450 550 600 700550 600 70070 250 250300 350 400 350 400 450 500 650450 550 60080250250 300 350 300 350 400 450 550400 450 55090250 250 300 300 300 350 400 500350 400 500100250 300 250 300 300 350 500350 400 450110250

BusBars and distriBution 06 DETERMINING THE USABLE CROSS-SECTION OF THE BARS 07 DETERMINING THE USABLE CROSS-SECTION OF THE BARS Sizing busbars The busbar cons

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