1、BSI Standards PublicationBS 376-2:2015Railway signalling symbols Part 2: Specification for symbols forcircuit diagramsPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2015Published by
2、 BSI Standards Limited 2015ISBN 978 0 580 83059 4ICS 01.080.20; 45.020The following BSI references relate to the work on this document:Committee reference GEL/9/1Draft for comment 14/30283498 DCPublication historyFirst published January 1933Second edition, January 1954Third (present) edition, April
3、2015Amendments issued since publicationDate Text affectedBS 376-2:2015 BRITISH STANDARDContents1 Scope 12 Normative references 13 Terms and definitions 14 Signalling relays and circuit diagrams 25 Electrical supply to railway signalling apparatus 96 Other apparatus 157 Nomenclature for circuit diagr
4、ams 28AnnexesAnnex A (informative) Examples of written circuits and wiring symbols 35Annex B (informative) Labelling wires 38Bibliography 39List of figuresFigure 1 Drawing of wires in written circuits 2Figure2Typical battery supply with intermediate terminal 13Figure3Typical transformer supply with
5、intermediate tapping 13Figure4Typical three phase supply 14Figure 5 Lever, thumb switch and push button contacts 21Figure 6 Marking of terminals on typical non-polar and polar relays 33Figure 7 Numbering of relay arms 33Figure 8 Identification of individual relay terminals 33Figure 9 Examples of ter
6、minals for lever contacts and lock provingcontacts 34Figure 10 Examples of terminals for catch handle contacts and footplungers 34Figure A.1 Block indicator and bell 35Figure A.2 Signal controls (written circuit) 36Figure A.3 Point controls (written circuit) 37Figure A.4 Signal location (wiring symb
7、ols) 37List of tablesTable 1 Combination of wiring symbols examples 3Table 2 Relay coils (electromagnets) 4Table 3 Relay contacts 6Table4Transformers, switchgear, earthing and other LV supplyarrangements 9Table 5 Signal box apparatus 16Table 6 Signals and indicators 22Table7Warning, protection and m
8、iscellaneous apparatus 24Table 8 Point operating mechanisms, point detectors and combinedmechanisms 24Table9Train detection apparatus 25Table 10 Conductors and circuit components 26Table 11 Assigned letters 29Table 12 Examples of the use of assigned letters 31Table 13 Contacts of relays that are hin
9、ged at the arm 33Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 40, an inside back cover and a back cover.BRITISH STANDARD BS 376-2:2015 The British Standards Institution 2015 iForewordPublishing informationThis part of BS 376 is published by B
10、SI Standards Limited, under licence from TheBritish Standards Institution, and came into effect on 30 April 2015. It wasprepared by Technical Committee GEL/9/1, Signalling and communications, underthe Technical Committee GEL/9, Railway electrotechnical applications. A list oforganizations represente
11、d on this committee can be obtained on request to itssecretary.SupersessionThis part of BS 376 supersedes BS 376-2:1954 Railway Signalling Symbols Part 2:Wiring symbols and written circuits, which is withdrawn.Relationship with other publicationsBS 376 is issued in two parts, namely: BS 376, Railway
12、 signalling symbols Part 1: Specification for schematicsymbolsPart 1 shows schematic symbols designed for use on railway layout plans toshow the signalling requirements. BS 376, Railway signalling symbols Part 2: Symbols for circuit diagrams SpecificationPart 2 (this part) shows the actual apparatus
13、 used, with its electricalconnections and simplified wiring diagrams.Information about this documentThis is a full revision of the standard, updated to current practice.This standard has its origins in a specification published by the Railway SignalAssociation in the USA in 1911, by which date a sch
14、eme of symbols andnomenclature for electrically operated apparatus had evolved, using bothwritten circuits and wiring symbols. Subsequent issues of the standard havesought to be backward-compatible with the original scheme, since signallingdocumentation is maintained for the whole life of the signal
15、ling.A standard system of nomenclature and labelling of wires is specified.Typical applications are illustrated in Annex A.If a symbol required for railway signalling purposes does not appear in thisstandard, the symbol should be taken from an appropriate British Standard orInternational Standard.Pr
16、esentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not con
17、stitute a normative element.Requirements in this standard are drafted in accordance with The BSI guide tostandardization Section 2: Rules for the structure, drafting and presentation ofBritish Standards, subclause 11.3.1, which states, “Requirements should beexpressed using wording such as: When tes
18、ted as described in Annex A, theproduct shall .”. This means that only those products that are capable ofpassing the specified test will be deemed to conform to this standard.BRITISH STANDARDBS 376-2:2015ii The British Standards Institution 2015This part of BS 376-2 shows railway signalling symbols
19、for written circuits andthe traditional wiring symbols in tables side by side.When necessary, to avoid confusion, diagrams may be marked with thefollowing reference:Symbols to BS 376-2:2015Contractual and legal considerationsThis publication does not purport to include all the necessary provisions o
20、f acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 376-2:2015 The British Standards Institution 2015 iiiBRITISH STANDARDBS 376-2:2015This page deliberately left blankiv The British Standar
21、ds Institution 20151 ScopeThis British Standard specifies the symbols to be used on railway signallingcircuit diagrams but does not provide guidance on their application.It also gives a standard system of nomenclature and labelling of wires such thateach wire can be readily identified with that show
22、n on the circuit diagram.This British Standard does not cover symbols for high voltage power distribution,telecommunications or electronic products. These are covered in IEC 60617 or anappropriate British Standard.This British Standard does not include proprietary systems and specializedapplications
23、.NOTE 1 The symbols in this British Standard provide for apparatus in general use.Wiring symbols have been designed so that they can be combined together whereone does not represent the complete device. In this British Standard, where certainelements are added for illustrative purposes, they are sho
24、wn by dashed lines. Ifadditional information is required to support the symbol, a “#” may be used toreference a note on the diagram.NOTE 2 The size of symbols as drawn are in proportion but are not necessarilyrelative to one another; nor do they give the specific size to be used. The relativethickne
25、ss of lines may also be varied, e.g. for contact elements.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest
26、edition of thereferenced document (including any amendments) applies.BS 7645, Code for designation of coloursBS 8586, Pin codes for BR 930 series relays Specification3 Terms and definitionsFor the purposes of this part of BS 376, the following terms and definitionsapply.3.1 biased (relay, device)two
27、-position electromagnetic device, being either:a) a polar device in which the armature in the de-energized state is driven in aspecified direction (normal or reverse) by magnetism, gravity or spring; orb) a neutral device operating only when current flows through the coil in aspecified direction (kn
28、own as “d.c. biased”)3.2 normal (state)display or position of a piece of apparatus in a designated state (usually itsquiescent state)3.3 polar (relay, device)two- or three-position electromagnetic device with two energized states (normaland reverse) depending upon the direction or phase of the curre
29、nt flowingthrough the coilNOTE A two-position device can either stick in its last operated position, or bebiased in the de-energised state.BRITISH STANDARD BS 376-2:2015 The British Standards Institution 2015 13.4 polarizedcircuit or armature in which the resulting operation is dependent on the pola
30、rityor phase of the currentNOTE A polarized circuit can either operate a polar device or a pair of d.c. biaseddevices wired in opposition.3.5 stick (relay)two-position electromagnetic device which is maintained in an operated state,being either:a) a polar device held in its last operated position by
31、 magnetism, gravity orspring, until operated in the opposite sense; orb) a neutral relay held energized over its own front contact until de-energizedby other circuit conditions4 Signalling relays and circuit diagrams4.1 Circuit diagramsSignalling circuit diagrams shall follow one of three types of r
32、epresentation:a) the now commonly used straight line diagram, also known as a writtencircuit, in which the symbols, with abbreviated designations, are drawn in astraight line, the two ends of which represent the terminals of the source ofsupply;b) the traditional method using wiring symbols in which
33、, generally, eachcomplete piece of apparatus is represented by a symbol, for example adirect current relay comprising a coil and at least one moving contact;c) a hybrid circuit plan, no longer widely used, by which internal wiring oranalysis is shown with wiring symbols, in conjunction with written
34、circuitsrepresenting through circuits.NOTE 1 The symbols for each type of circuit diagram are given in Table 2 toTable 10.NOTE 2 The intended nomenclature for the circuits is shown opposite each symbol.Further details of nomenclature are given in Clause 7.NOTE 3 For comparison, examples of circuit d
35、iagrams using written circuits andwiring symbols are illustrated in Annex A.4.2 Written circuitsFor written circuits, the following conventions shall be conformed to, asappropriate:a) Wires shall be clearly drawn in straight lines irrespective of the relativepositions of the apparatus, as shown in F
36、igure 1.Figure 1 Drawing of wires in written circuitsb) Unless otherwise indicated, the left, or upper, termination of the line shallbe considered to be positive, or feed of supply.NOTE 1 This is in accordance with the general convention given in 7.3.BRITISH STANDARDBS 376-2:20152 The British Standa
37、rds Institution 2015NOTE 2 Orientation of the symbols may be varied to suit.NOTE 3 Electrical supply nomenclature is given in 5.2.c) The number of each contact in the relay shall be indicated by a numeral oran alphanumeric under the circuit line in accordance with 7.3. This shall alsoapply to lever
38、bands, circuit controllers and other contacts.d) Because constituent components, such as relay coils and contacts, areseparated in written circuits, a schedule shall be provided for eachapparatus to analyse the terminals used.NOTE 4 Such an analysis may incorporate circuit diagram sheet number andnu
39、mber of wires on each terminal. It may be applied to terminal and fuse racks, aswell as relays, lever bands and circuit controllers.4.3 Wiring symbolsFor wiring symbols, the following conventions shall be conformed to, asappropriate:a) Relays shall be shown by combining the symbols given in Table 2
40、andTable 3, as illustrated in Table 1.NOTE 1 Wiring symbols may be laid out so as to depict the relative positions of theapparatus, as shown in Figure A.4.Table 1 Combination of wiring symbols examplesDescription Combined symbolD.C. neutral relay, fitted with oneindependent front contact and oneinde
41、pendent back contact, and shownenergizedA.C. relay, double element with three-positionarmature fitted with one N and one Rdependent contactD.C. neutral polar relay with neutral armaturefitted with one front and one backdependent contacts and polarized armature,fitted with one N and one R dependentco
42、ntactsNOTE 2 Wiring symbols may be drawn to show the quiescent state of the circuit.b) The sign shall be used to indicate alternating current. Unless so indicated,direct current shall be assumed, for example:Electromagnet a.c.Bell a.c.4.4 Symbols for relay coils and relay contactsOn circuit diagrams
43、 the symbols for relay coils given in Table 2 and the symbolsfor relay contacts given in Table 3 shall be used, as appropriate.BRITISH STANDARD BS 376-2:2015 The British Standards Institution 2015 3Table 2 Relay coils (electromagnets)SymbolNo.Nomen-clatureDescription Written circuit Wiring Symbol2.1
44、 L, R,V, WElectromagnet, polar or non-polarA)2.2 R Electromagnet, with double windingB)C)2.3 RQElectromagnetic system, requiring twoenergized windings (a.c.)C)2.4 R Electromagnet, slow actingD)2.5 R Electromagnet, slow releaseD)2.6 R Electromagnet, slow pick-upD)2.7 R D.C. biased relay, operating on
45、ly whencurrent flows through coil in directionof arrow2.8 R Magnetically latched non-polar relay,the single armature remaining in itslast operated position until relay isnext energized or released C)2.9 R Magnetic stick polar relay, the singlearmature remaining in its lastoperated position until rel
46、ay isenergized in the opposite senseC)2.10 R Interlocked relay, mechanicalinterlocking preventing botharmatures assuming fully energizedposition at the same timeC)2.11 R Interlocked relay, mechanicalinterlocking preventing botharmatures assuming fully de-energizedposition at the same timeC)2.12 RRRe
47、lay with twin independent coils andarmaturesE)2.13 R Flasher relayBRITISH STANDARDBS 376-2:20154 The British Standards Institution 2015Table 2 Relay coils (electromagnets)SymbolNo.Nomen-clatureDescription Written circuit Wiring SymbolA)General symbol to be used for lock, relay, trainstop, point valv
48、e, etc.B)Add note if differentially wound.C)Each winding shown separately or together. A dotted line shows that reference to the other circuit is required.D)Typically 150 ms or greater.E)Example shows coils wired in parallel for integrity.BRITISH STANDARD BS 376-2:2015 The British Standards Institut
49、ion 2015 5Table3RelaycontactsSymbol No.Nomen- clatureDescriptionWrittencircuitWiringsymbolA)3.1Frightforbiasedtoreverse.C)TimetobespecifiedbesideJRname.BRITISH STANDARDBS 376-2:20158 The British Standards Institution 20155 Electrical supply to railway signalling apparatus5.1 Symbols for low voltage supply arrangementsWhere low voltage (LV) or extra-low voltage electrical supply arrangements areto be shown on a railway signalling circuit diagram, the symbols given inTable 4 shall be used, as ap
