EN 60439-2:2000
(Main)Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
Applies to busbar trunking systems intended to supply luminaires through tap-off units but does not apply to supply track systems in accordance with IEC Publication 570.
Niederspannungs-Schaltgerätekombinationen - Teil 2: Besondere Anforderungen an Schienenverteiler
Ensembles d'appareillage à basse tension - Partie 2: Règles particulières pour les canalisations préfabriquées
S'applique également aux canalisations préfabriquées destinées à alimenter des luminaires par l'intermédiaire d'éléments de dérivation, mais elle ne s'applique pas aux systèmes d'alimentation par rails conformes à la Publication 570 de la CEI.
Sestavi nizkonapetostnih stikalnih in krmilnih naprav– 2. del: Posebne zahteve za zbiralčne razdelilne sisteme (zbiralčna vodila)
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Niederspannungs-Schaltgerätekombinationen -- Teil 2: Besondere Anforderungen an SchienenverteilerEnsembles d'appareillage à basse tension -- Partie 2: Règles particulières pour les canalisations préfabriquéesLow-voltage switchgear and controlgear assemblies -- Part 2: Particular requirements for busbar trunking systems (busways)29.130.20Nizkonapetostne stikalne in krmilne napraveLow voltage switchgear and controlgearICS:Ta slovenski standard je istoveten z:EN 60439-2:2000SIST EN 60439-2:2000en01-september-2000SIST EN 60439-2:2000SLOVENSKI
STANDARDSIST EN 60439-2:19961DGRPHãþD
SIST EN 60439-2:2000
SIST EN 60439-2:2000
SIST EN 60439-2:2000
SIST EN 60439-2:2000
SIST EN 60439-2:2000
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60439-2Troisième éditionThird edition2000-03Ensembles d'appareillage à basse tension –Partie 2:Règles particulières pour lescanalisations préfabriquéesLow-voltage switchgear andcontrolgear assemblies –Part 2:Particular requirements forbusbar trunking systems (busways) Commission Electrotechnique Internationale International Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogueÓ IEC 2000
Droits de reproduction réservés
¾
Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permission inwriting from the publisher.International Electrotechnical Commission3, rue de Varembé
Geneva, SwitzerlandTelefax: +41 22 919 0300e-mail: inmail@iec.ch IEC web site
http://www.iec.chCODE PRIXPRICE CODEVSIST EN 60439-2:2000
60439-2 © IEC:2000– 3 –CONTENTSPageFOREWORD.5Clause1General.92Definitions.113Classification of ASSEMBLIES.134Electrical characteristics of ASSEMBLIES.155Information to be given regarding the ASSEMBLIES.196Service conditions.197Design and construction.218Test specifications.27Annex J (informative)
Voltage drop of the system.47Annex K (informative)
Method of determination of the magnetic field in the vicinityof busbar trunking system.49Annex L (informative)
Verification of maintenance circuit integrity under fire conditions.51Annex M (informative)
Test arrangement (see IEC 60332-3).53Annex N (informative)
Method of determination of the electrical characteristicsof busbar trunking systems by calculations from measurements.57SIST EN 60439-2:2000
60439-2 © IEC:2000– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION____________LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –Part 2: Particular requirements for busbar trunking systems (busways)FOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the InternationalOrganization for Standardization (ISO) in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)
In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)
Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60439-2 has been prepared by subcommittee 17D: Low-voltageswitchgear and controlgear assemblies, of IEC technical committee 17: Switchgear andcontrolgear.This third edition cancels and replaces the second edition published in 1987 and itsamendment 1 (1991). This third edition constitutes a technical revision.The text of this standard is based on the second edition, amendment 1 and the followingdocuments:FDISReport on voting17D/225/FDIS17D/228/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.Annexes J, K, L, M and N are for information only.Busbar trunking systems (busways) shall comply with all requirements of IEC 60439-1, if nototherwise indicated hereinafter and shall also comply with the particular requirementscontained in this standard.SIST EN 60439-2:2000
60439-2 © IEC:2000– 7 –The clauses of this standard supplement, modify or replace the corresponding clauses inIEC 60439-1.Where there is no corresponding clause or subclause in this standard, the clause orsubclause of the main document applies without modification as far as is reasonable.In view of the fact that this standard should be read in conjunction with IEC 60439-1, thenumbering of its clauses and subclauses corresponds to the latter.The committee has decided that the contents of this publication will remain unchanged until2003-03. At this date, the publication will be·reconfirmed;·withdrawn;·replaced by a revised edition, or·amended.SIST EN 60439-2:2000
60439-2 © IEC:2000– 9 –LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –Part 2: Particular requirements for busbar trunking systems (busways)1 General1.1
Scope and objectAdd the following paragraphs:This International Standard applies to busbar trunking systems (BTS) and their accessoriesfor feeding and distributing electrical power in residential, retail, public, agricultural andindustrial premises. It also applies to busbar trunking systems which are designed toincorporate communication and/or control systems or intended to supply luminaires throughtap-off units but does not apply to supply track systems in accordance with IEC 60570.The busbar trunking systems considered in this standard are type-tested ASSEMBLIES (TTA)when tested in accordance with clause 8 of this standard; variations in length and angles ofbends are considered to be covered.Tap-off units may be partially type-tested ASSEMBLIES (PTTA).1.2
Normative referencesInsert in the existing list the titles of the following standards:IEC 60269 (all parts), Low-voltage fusesIEC 60332-3:1992, Tests on electric cables under fire conditions – Part 3: Tests on bunchedwires or cablesIEC 60439-1:1999, Low-voltage switchgear and controlgear assemblies – Part 1: Type-testedand partially type-tested assembliesIEC 60570:1995, Electrical supply track systems for luminaires*IEC 60695-2-1, Fire hazard testing – Part 2-1: Test methods – Glow wireIEC 60909:1988, Short-circuit current calculation in three-phase a.c. systemsIEC 60947-2:1995, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers**ISO 834-1:1999, Fire-resistance tests – Elements of building construction – Part 1: Generalrequirements___________*There is a consolidated edition 1.1 (1998) that includes IEC 60570 (1995) and amendment 1 (1998).**There is a consolidated edition 2.1 (1998) that includes IEC 60947-2 (1995) and amendment 1 (1997).SIST EN 60439-2:2000
60439-2 © IEC:2000– 11 –2 Definitions2.1.1.2partially type-tested low-voltage switchgear and controlgear ASSEMBLY (PTTA)Replace the existing text by:applicable only for tap-off units2.3.4busbar trunking system (busway)Add before the note the following new item:– additional conductors for communication and/or controlAdd the following definitions:2.3.5busbar trunking unitunit of a busbar trunking system complete with busbars, their supports and insulation,external enclosure and any fixing and connecting means to other units, with or withouttap-off facilitiesNOTE
Trunking units may have different geometrical shapes such as straight length, elbow, tee or cross.2.3.6busbar trunking unit with tap-off facilitiesbusbar trunking unit designed to enable tap-off units to be installed at one or more points aspredetermined by the manufacturerThe connection of tap-off units to the busbar trunking unit may or may not require the busbarsystem to be disconnected from the supply2.3.7busbar trunking unit with trolley-type tap-off facilitiesbusbar trunking unit designed to permit the use of roller- or brush-type tap-off units2.3.8busbar trunking adapter unitbusbar trunking unit intended to connect two units of the same system but of different type orof different rated current2.3.9busbar trunking thermal expansion unitbusbar trunking unit intended to permit a certain movement in the axial direction of the busbartrunking due to thermal expansion of the systemNOTE
The expansion element may apply to the conductor within the enclosure or both enclosure and conductorsaccording to the design.2.3.10busbar phase transposition unitbusbar trunking unit intended to change the relative positions of the phase conductors inorder to balance the inductive reactances or to transpose the phases (such as L1-L2-L3-N toN-L3-L2-L1)SIST EN 60439-2:2000
60439-2 © IEC:2000– 13 –2.3.11flexible busbar trunking unitbusbar trunking unit having conductors and enclosures designed to be bent during installation2.3.12busbar trunking feeder unitbusbar trunking unit serving as any incoming unit. The connection of the feeder unit to thesupply may or may not require the supply to be disconnected2.3.13tap-off unitoutgoing unit for tapping-off power from the busbar trunking unit with tap-off facilities (see2.3.6), such as rollers, brushes or plug-in devicesA tap-off unit may also be permanently connected and can be intended for one or anycombinations of power, communication or control circuits.A tap-off unit may contain accessories, such as protective devices (for example fuse, fuse-switch, switch-fuse, circuit-breaker, residual current circuit-breaker), electronic apparatus forcommunication or remote control, contactors, socket-outlets, connecting facilities such asprewired, screw-type or screw-less type terminals, etc.Tap-off units may be partially type-tested assemblies (PTTA).2.3.14busbar trunking unit for building movementsbusbar trunking unit intended to allow for building movements due to thermal expansion andcontraction of the building2.3.15busbar trunking fire barrier unitbusbar trunking unit or a part of a busbar trunking unit, with or without additional parts,intended to prevent the propagation of fire for a specified time under fire conditions2.3.16busbar trunking fire resistant unitbusbar trunking unit, with or without additional parts, intended to maintain electrical circuitintegrity for a specified time under fire conditions3 Classification of ASSEMBLIESAdd to the existing dashed items the following new items:–the mechanical loads they can withstand in use (see 7.1.1.1 to 7.1.1.3);–resistance to fire and to flame propagation, if applicable (see 7.1.1.4 to 7.1.1.7).Add a new paragraph as follows:Busbar trunking systems and their accessories may be installed, according to the design, inindoor and outdoor locations, in various attitudes, in different mounting conditions; themanufacturer of the BTS shall state the applicable conditions.SIST EN 60439-2:2000
60439-2 © IEC:2000– 15 –4 Electrical characteristics of ASSEMBLIES4.5
Rated conditional short-circuit current (Icc)Add new note 3 to the existing notes:NOTE 3
The rated conditional short-circuit current (Icc) should be stated (for example, for tap-off units) for thecorresponding protective device, if any (see 8.2.3.2.4).Add the following new subclause:4.9
Electrical characteristics of busbar trunking system4.9.1
Resistance, reactance and impedance values of the systemThe manufacturer shall state in the manner described in clause 5 the following characteristicsof the phase conductors of the system:–the mean ohmic resistance of the phase conductors, per metre length:–R20at a temperature of +20 °C;–R1 at rated current In, at the steady-state operating temperature q1;–the mean reactance of the phase conductors, per metre length:–X1 at rated current In, at rated frequency F;–the mean impedance of the phase conductors, per metre length:–Z1 at the steady state operating temperature q1.NOTE
These values are determined according to 8.2.9, by direct measurement or by calculations frommeasurements (see clause N.1).The voltage drop of the system may be determined by calculations from these resistance and reactance values(see annex J).The steady-state operating temperature q1 is equal to the temperature rise Dq1 at the rated current In plus 35 °C,the conventional ambient temperature for the busbar trunking system.1/221211)(XRZ+= and is also the phase-sequence impedance (positive or negative) of the system, at thesteady state operating temperature q1.4.9.2
Resistance, reactance and impedance values of the systemunder fault conditionsThe following applies to BTS rated above 100 A.The manufacturer shall state in the manner described in clause 5 the following fault-loopimpedance values, in order to permit calculations of short-circuit and fault currents in everypoint of an electrical installation which includes a busbar trunking system.Either of the following methods may be used to calculate such fault currents:SIST EN 60439-2:2000
60439-2 © IEC:2000– 17 –a)
Method of symmetrical components (see IEC 60909):–the zero-sequence impedance of the conductors being considered at a temperature of+20 °C, per metre length:–N ph 0Zphase-to-neutral–PEN ph 0Zphase-to-PEN–PE ph 0Zphase-to-PEb)
Method of impedances:–the mean ohmic resistance of the conductors being considered at a temperature of+20 °C, per metre length:–ph ph
b0Rphase-to-phase–N ph
b0Rphase-to-neutral–PEN ph
b0Rphase-to-PEN–PE ph
b0Rphase-to-PE–the mean ohmic resistance of the conductors being considered at rated current In, at thesteady-state operating temperature q1 of the system, per metre length:–ph ph
b1Rphase-to-phase–N ph
b1Rphase-to-neutral–PEN ph
b1Rphase-to-PEN–PE ph
b1Rphase-to-PE–the mean ohmic reactance of the conductors being considered, at rated current In, at ratedfrequency F, per metre length:–ph ph bXphase-to-phase–N ph bXphase-to-neutral–PEN ph bXphase-to-PEN–PE ph bXphase-to-PENOTE
These values may be determined by direct measurement or by calculations from measurements (seeclause N.2).4.9.3
Short-circuit characteristics of the systemThe manufacturer shall state one or more of the following rated short-circuit characteristics ofthe conductors of the busbar trunking system:Iccrated conditional short-circuit current (A)Icwrated short-time withstand current and Ipk peak short-circuit current according to 7.5.2and 8.2.3 (A)SIST EN 60439-2:2000
60439-2 © IEC:2000– 19 –5 Information to be given regarding the ASSEMBLIES5.1
NameplateAfter the first paragraph add the following paragraph:One nameplate shall be located near one end of each busbar trunking unit and one on eachtap-off unit. If the busbar trunking enclosure is used as a PE conductor and if a terminal isprovided for external connection to the enclosure, this terminal should be marked accordingto 7.6.5.2.Add the following items u) and v):u)resistance, reactance and impedance values of the system (see 4.9.1);v)resistance, reactance and impedance values of the system under fault conditions (see 4.9.2).6 Service conditions6.1.1
Ambient air temperatureAdd the following new subclause:6.1.1.3
Reference ambient air temperature for busbar trunking systemUnless otherwise specified, the rated current of the busbar trunking system, according totable 3 and 8.2.1.3, shall be stated by the manufacturer for the reference ambient airtemperature of 35 °C.Rating factors, if applicable, should be stated by the manufacturer (k1 = 1 for 35 °C) todetermine the allowable current (I = k1 ´ In) of the system according to the range oftemperatures in mounting conditions.6.2
Special service conditionsAdd the following new subclauses:6.2.11
Mounting conditions for busbar trunking systemIf a busbar trunking system can be used in different mounting conditions (for example,changes of the orientation of conductors), according to clause 3, the manufacturer shall statethe corresponding mounting factor (k2), if any, to determine the resulting allowable currentof the system taken equal to .n21IkkI´´=6.2.12
Power frequency magnetic fieldIt may be necessary in certain installations (for example, those involving high-speed datanetworks, radiology apparatus, workstation monitors, etc.) to know the strength of the powerfrequency magnetic field in the vicinity of the busbar trunking.A method for measurement and calculation of the modulus of the magnetic field around thebusbar trunking is given in annex K.SIST EN 60439-2:2000
60439-2 © IEC:2000– 21 –7 Design and construction7.1
Mechanical design7.1.1
GeneralAdd the following text:Busbar trunking systems shall be designed as type-tested low-voltage switchgear andcontrolgear ASSEMBLIES (TTA).According to the manufacturer's indications, busbar trunking systems are intended towithstand:–either normal mechanical loads (see 7.1.1.1);–or heavy mechanical loads (see 7.1.1.2);–or special mechanical loads (see 7.1.1.3).7.1.1.1
Normal mechanical loadsFor busbar trunking systems, normal mechanical loads include, in addition to their ownweight, mechanical loads imposed by the feeder and tap-off units.NOTE 1
The necessary mechanical rigidity may be obtained by the choice of material, its thickness, its shape,and/or by the number of and position of fixing points as indicated by the manufacturer.NOTE 2
Feeder units supported by their own separate fixings shall not be included in normal mechanical loads.7.1.1.2
Heavy mechanical loadsFor busbar trunking systems, heavy mechanical loads include, in addition to the normalmechanical loads, additional loads such as the weight of a person.NOTE 1
The necessary mechanical rigidity may be obtained by the choice of material, its thickness, its shape,and/or by the number of and position of fixing points as indicated by the manufacturer.NOTE 2
The statement does not imply that the busbar trunking system may be used as a walkway.7.1.1.3
Special mechanical loadsThe ability of busbar trunking systems to withstand other additional loads, such as lightingapparatus, additional cables, ladder supports, etc., shall be subject to agreement betweenmanufacturer and user.7.1.1.4
Resistance of insulating materials to abnormal heatParts of insulating material of the busbar trunking system, which might be exposed to thermalstresses due to electrical effects and the deterioration of which might impair the safety of thesystem, shall not be unduly affected by abnormal heat.Compliance is checked by the glow wire test according to 8.2.13.7.1.1.5
Resistance to flame propagationA non-flame-propagating busbar trunking system, either shall not ignite or, if ignited, shall notcontinue to burn when the source of ignition is removed.Compliance is checked by the flame-propagation tests according to 8.2.14.SIST EN 60439-2:2000
60439-2 © IEC:2000– 23 –7.1.1.6
Busbar trunking fire barrier unitA busbar trunking fire barrier unit shall be designed to prevent the propagation of fire, for aspecified time, under fire conditions, when the busbar trunking system passes throughhorizontal or vertical building divisions (for example, wall or floor).Compliance is checked by the fire-resistance test according to 8.2.15.7.1.1.7
Maintenance of circuit integrity under fire conditionsA fire-resistant busbar trunking unit may be designed to maintain the integrity of electricaldistribution circuits, for a specified time, under fire conditions.A test for circuit integrity under fire conditions is under consideration (see annex L).7.1.2.3.4
ClearancesAfter the first paragraph, add the following paragraph:Clearances shall be dimensioned, when the busbar trunking system is correctly assembled inaccordance with the manufacturer’s instructions and mounted as in service, to withstand therequired impulse voltage stated by the manufacturer, considering the overvoltage categoryand the maximum of the rated operational voltage to earth, as specified in IEC 60439-1,table G.1.Unless otherwise stated by the manufacturer, the dimensioning of the clearances of thesystem shall be based on:–overvoltage category: IV (origin of installation) or III (distribution circuit level);–pollution degree: 3.NOTE
Clearances values for basic and functional insulation are dimensioned as specified in IEC 60439-1,table 14, case A. Clearance values of supplementary insulation are not less than those specified for basicinsulation. Clearance values for reinforced insulation are dimensioned to the rated impulse voltage one step higherthan those specified for basic insulation.Parts of the system provided with double insulation where basic insulation and supplementary insulation cannot betested separately are considered as reinforced insulation.Delete the second paragraph.7.1.2.3.5
Creepage distancesa)
DimensioningAfter the first paragraph, add the following paragraph and note:Creepage distances shall be dimensioned, when the busbar trunking system is correctlyassembled in accordance with the manufacturer’s instructions and mounted as in service, forthe rated insulation voltage of the system stated by the manufacturer.SIST EN 60439-2:2000
60439-2 © IEC:2000– 25 –NOTE
Creepage distances values for basic and functional insulation are dimensioned as specified inIEC 60439-1, table 16, according to the pollution degree and the material group which apply to the insulating parts.Creepage distance values of supplementary insulation are not less than those specified for basic insulation.Creepage distance values of reinforced insulation are dimensioned for twice the value of the rated insulationvoltage as specified for basic insulation.Creepage distances of double insulation are the sum of the basic and supplementary insulation which compose thedouble insulation system.Add subclause 7.1.4 as follows:7.1.4
Requirements for the correct connection of tap-off unitsWhen a busbar trunking system with predetermined tap-off facilities has a protectiveconductor or a neutral conductor or both, the design shall be such that, for reasons of safety,incorrect assembly of any part of the system or connection of the tap-off units is prevented.In the case of d.c. or single-phase a.c. the order of polarities shall be maintained throughoutthe entire length of the system.Attention is drawn to 7.4.3.1.5 f), which applies to plug-in tap-off units.Add subclause 7.1.5 as follows:7.1.5
Requirements for busbar trunking with several circuitsWhen a busbar trunking system with or without tap-off facilities is intended to fit severalcircuits in the same duct (for example, different power circuits, communication or datatransmission, extra-low-voltage circuits), the system shall be so designed and constructed toprevent any risk of likely failures, fault or wrong connections between the circuits.The different circuits should preferably be designed to be physically separated in the duct.When this requirement is impracticable each circuit shall be insulated from the others or fromthe metallic parts, bonded or not to the protective earth conductor, for the highest ratedinsulation voltage of any parts of the system stated by the manufacturer.NOTE
A double insulation system between low-voltage circuits and extra-low-voltage communication circuits maybe required by some data transmission standards.7.3
Temperature riseTable 2 – Temperature rise limitsReplace note 4 by the following note:Unless otherwise specified, in the case of external surfaces of enclosures of busbar trunking systems which areaccessible but do not need to be touched during normal operation, an increase in the temperature-rise limits by 25 K ispermissible for metal surfaces and by 15 K for insulating surfaces.Add the following new paragraph after table 2:Attention is drawn to the fact that the busbar trunking system shall be so designed (especiallyfor the joints) to withstand the overload conditions which can occur in service, according tothe wiring regulations and to the type of protective device (for example, 1,30 times the currentsetting of a circuit-breaker, for a conventional time of 2 h, see IEC 60947-2).SIST EN 60439-2:2000
60439-2 © IEC:2000– 27 –7.4.2
Protection against direct contactAdd a new paragraph to the existing text as follows:Covers or parts, made of insulating material or not, which secure the protection againstelectric shock shall have a sufficient mechanical strength to withstand the likely stressoccurring in normal conditions.7.4.3.1.1
Add a new paragraph to the existing text as follows:In busbar trunking systems with trolley tap-off facilities, constructional precautions shall betaken to ensure good and permanent conductivity between the exposed conductive parts oftap-off units and the stationary exposed conductive parts of the trunking system, in particularwhen the enclosure of the fixed unit is part of the protective circuit of the installation.7.6.2.1
AccessibilityFirst paragraph not applicable.8 Test specificationsReplace the existing text by the following:8.1.1
Type tests (see 8.2)Type tests are intended to verify compliance with the requirements laid down in this standardfor a given type of busbar trunking system.Type tests shall be carried out on a sample of such a busbar trunking system or on such partsof busbar trunking systems manufactured to the same or a similar design.They shall be carried out on the initiative of the manufacturer.Type tests includea)verification of temperature-rise limits (see 8.2.1);b)verification of dielectric properties (see 8.2.2);c)verification of short-circuit strength (see 8.2.3);d)verification of the effectiveness of the protective circuit (see 8.2.4);e)verification of clearances and creepage distances (see 8.2.5);f)verification of mechanical operation (see 8.2.6);g)verification of the degree of protection (see 8.2.7);h)verification of electrical characteristics of busbar trunking system (see 8.2.9);j)verification of structural strength (see 8.2.10);k)verification of the endurance of trunking systems with trolley type tap-off facilities (see 8.2.11);l)verification of crushing resistance (see 8.2.12);m)verification of the resistance of insulating materials to abnormal heat (see 8.2.13);n)verification of resistance to flame propagation (see 8.2.14);o)verification of fire barrier in building penetration (see 8.2.15).SIST EN 60439-2:2000
60439-2 © IEC:2000– 29 –These tests may be carried out in any order and/or on different samples of the same type.If modifications are made to the components of the ASSEMBLY, new type tests have to becarried out only in so far as such modifications are likely to adversely affect the results ofthese tests.NOTE
Reference should also be made to the additions to 8.2.1 and 8.2.3 given in this standard.8.2
Type tests8.2.1
Verification of temperature-rise limitsReplace the exiting test by the following:8.2.1.2
Arrangement of the busbar trunking systemThe busbar trunking system to be tested shall be arranged as in normal use, with all covers,etc., in place.The current rating of a busbar trunking system is affected by the mounting arrangement.Therefore, the temperature-rise test has to be performed with the rated current appropriate tothe mounting arrangement(s) stated by the manufacturer. If only one test is performed, themost unfavourable mounting arrangement shall be used.8.2.1.3
Temperature-rise testa)
Bu
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.