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IS 613: Copper Rods and Bars for Electrical Purposes PDF

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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 613 (2000): Copper Rods and Bars for Electrical Purposes [MTD 8: Copper and Copper Alloys] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 613:2000 Indian Standard COPPER RODS AND SRAB ROF LACIRTCELE PURPOSES - NOITACIFICEPS ( Third Revision ) ICS 77.150.3b 0 BIS 2000 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 Jutle 2000 Price Group 4 Copper dna Copper syollA lanoitceS ,eettimmoC DTM 8 DROWEROF sihT naidnI dradnatS drihT( )noisiveR was adopted yb the uaeruB of naidnI ,sdradnatS after the draft dezilanif yb the Copper dna Copper syollA lanoitceS eettimmoC had neeb devorppa yb the lacigrullateM gnireenignE noisiviD .licnuoC sihT dradnats was tsrif dehsilbup ni 1954 dna yltneuqesbus desiver ni 1964 dna 1984. nI siht noisiver the gniwollof snoitacifidom evah neeb :edam / a) ssenthgiartS eulav of 3 mm for yreve 1 000 mm has neeb added. )b esualC no esiwegde gnidneb has neeb .deteled c) suidaR no edges evah neeb deifidom dna won nevig ni .liated d) nI drah-flah ,noitidnoc ssendrah seulav deificeps as 70 ot 90 HV. e) ecnerefeR of cathode copper has neeb .deteled f) ytivitcudnoC dna ytivitsiser seulav for drah-flah dna hard repmet noitidnoc evah neeb .deifidom g) snoisnemiD dna secnarelot for ,dnuor ,erauqs ralugnatcer dna lanogaxeh srab/sdor evah neeb .dedulcni h) elbaT no lacinahcem seitreporp has neeb .deifidom )j esualC no dneb test has neeb added. roF the esoprup of rehtehw~gnidiced a ralucitrap tnemeriuqer of siht dradnats si deilpmoc htiw the lanif ,eulav devresbo or ,detaluclac gnisserpxe the tluser of a test or ,sisylana llahs eb dednuor off ni ecnadrocca htiw SI 2 : 1960 seluR‘ for gnidnuor off laciremun seulav .‘)desiver( ehT rebmun of tnacifingis secalp deniater ni the dednuor off eulav dluohs eb the emas as that of the deificeps eulav ni siht .dradnats SI 613 : 2000 Zndian Standard COPPER RODS AND SRAB ROF LACIRTCELE PURPOSES - NOITACIFICEPS ( Third Revision ) 4.2 muminiM lanoitceS-ssorC noisnemiD 1 SCOPE sihT dradnats srevoc the stnemeriuqer for copper rods ehT retemaid ni the case of ,sdnuor htdiw across stalf dna srab for lacirtcele .sesoprup ni the case of erauqs dna lanogaxeh shapes, the rellams edis htdiw ni the case of ralugnatcer rods. 2 SECNEREFER 5 LACISYHP STNATSNOC ehT gniwollof naidnI sdradnatS niatnoc snoisivorp hcihw hguorht ecnerefer ni siht text, etutitsnoc 5.1 ehT stnatsnoc nevig ni xennA A are desab no noisivorp of siht .dradnats tA the emit of ,noitacilbup sdradnats dexif yb the lanoitanretnI lacinhcetortcelE the snoitide detacidni were .dilav llA sdradnats are .noissimmoC tcejbus ot noisiver dna seitrap ot stnemeerga desab no 5.2 tneiciffeoC of raeniL noisnapxE siht dradnats are degaruocne ot etagitsevni the ytilibissop of gniylppa the tsom tnecer snoitide of the ehT tneiciffeoc of noisnapxe-raenil of delaenna or -drah sdradnats detacidni :woleb nward ytivitcudnoc-hgih copper revo a egnar of 0 ot C°051 llahs eb nekat as 0.000 .C“/710 SI No. Title 191 : 1980 :reppoC 5.3 Mass (Part 5) : 1980 citylortcelE hguot hctip copper )PTE( driht( )noisiver tA a erutarepmet of 2O”C, the ytisned of -hgih (Part 6) : 1980 eriF denifer hgih ytivitcudnoc ytivitcudnoc copper llahs eb nekat as 8.89 .3mc/g copper )CHRF( (third revision) 440 : 1964 Methods of lacimehc sisylana of 5.4 ecnatsiseR of a Solid Conductor copper (revised) -5.4.1 roF the esoprup of ,noitaluclac the ecnatsiser at 1387 : 1993 lareneG stnemeriuqer for the ylppus C°02 of a dilos rotcudnoc of delaenna -hgih of lacigrullatem slairetam dnoces( ytivitcudnoc copper, eno ertem ni htgnel dna of a revision) mrofinu lanoitces-ssorc area of eno erauqs ertemillim 1599 : 1985 Methods for dneb test dnoces( has neeb nekat as 0.017 241 .mho revision) 1608 : 1995 lacinahceM gnitset of slatem - NOTE - reppoC hcihw ta C°02 sah a ytivitsiser fo 85/l = 710.0( )...142 mho m/’mm si dias ot evah a ytivitcudnoc fo elisneT gnitset dnoces( revision) 001 tnecrep .S.CA1 1817 : 1981 Methods of gnilpmas suorref-non 5.4.2 ehT ecnatsiser of nward-drah ytivitcudnoc-hgih slatem for lacimehc sisylana copper si a noitcnuf of sti ,ssendrah dna the elisnet 3288 yrassolG of smret for copper dna htgnerts si na etamixorppa noitacidni of the degree of copper :syolla .ssendrah nihtiW a egnar morf 305 ot 460 MPa elisnet (Part )I : 1986 slairetaM (third revision) ,htgnerts the gniwollof alumrof has neeb dnuof ot (Part 3) : 1986 thguorW smrof express yltneiciffus esolc ot the stluser ni ,ecitcarp dna 3635 : 1966 Methods of test for ecnatsiser of has neeb adopted ni gnitaluclac the ecnatsiser of -drah cillatem lacirtcele ecnatsiser nward copper nevig ni siht dradnats : lairetam &-=P 3 YLPPUS FO LAIRETAM lareneG stnemeriuqer gnitaler ot the ylppus of lairetam where llahs mrofnoc ot SI 1387. P = egatnecrep esaercni ni ytivitsiser of the nward-drah copper eriw revo sti ytivitsiser 4 YGOLONIMRET nehw- ,delaenna dna 4.1 roF the esoprup of siht ,dradnats the noitinifed of T = elisnet htgnerts of the nward-drah copper smret nevig ni SI 3288 (Parts 1 dna 3) dna the eriw ni MPa. gniwollof llahs .ylppa roF the noitanimreted of the secnatsiser of nward-drah SI 613 : 2000 ytivitcudnoc-hgih copper yb the alumrof nevig ,evoba gniwollof snoitidnoc as deificeps yb the :resahcrup the ecnatsiser of delaenna ytivitcudnoc-hgih copper 0 - delaennA at C°02 as nevig rednu 5.4.1 has neeb nekat as .sisab HB - drah-flaH 5.5 tnatsnoC Mass erutarepmeT tneiciffeoC of HD - Hard ecnatsiseR 8 LACIMEHC NOITISOPMOC 5.5.1 tA a erutarepmet of 2o”C, the tneiciffeoc of 8.1 ehT lairetam llahs evah lacimehc noitisopmoc as noitairav of the ecnatsiser htiw erutarepmet of nevig ni for grades ,PTE CHRF of SI 191 (Part 5) or delaenna ytivitcudnoc-hgih copper neewteb&rusaem SI 191 (Part 6) .ylevitcepser two laitnetop stniop yldigir dexif ot the eriw has neeb nekat as 0.003 .C°139 8.2 ehT lacimehc noitisopmoc llahs eb denimreted rehtie yb the dohtem deificeps ni SI 440 or yna other 5.5.2 tA a erutarepmet of 2O”C, the tneiciffeoc of dehsilbatse lacimehc/latnemurtsni .dohtem nI case noitairav of the ecnatsiser htiw erutarepmet of -drah of etupsid the erudecorp deificeps ni the tsetal noisrev nward ytivitcudnoc-hgih copper derusaem neewteb of SI 440 for lacimehc ,sisylana llahs eb the referee two laitnetop stniop yldigd dexif ot the eriw has neeb .dohtem revewoH nehw the dohtem si ton nevig ni nekat as 0.003 81/V, hcihw si na egareva eulav for SI 440 the referee dohtem llahs eb as agreed ot copper of 97 tnecrep .ytivitcudnoc neewteb the resahcrup dna the .rerutcafunam NOTE - reppoC hcihw ta C°02 sah a ytivitsiser fo 8511 = 710.0( )....142 mho ml’mm si dias ot evah a ytivitcudnoc 9 LACINAHCEM SEITREPORP fo 001 tnecrep .SCAI 9.1 elisneT tseT 6 MODEERF MORF STCEFED ehT lairetam nehw tested for elisnet test dna ssendrah ehT rods dna srab llahs eb thgirb dna .naelc tI llahs ni ecnadrocca htiw SI 1608 dna SI 1501 (Parts 1 dna eb free morf ,sretsilb ,srevils ,elacs ,snif ,sllips cracks 2) llahs evah the seitreporp as nevig ni elbaT 1. dna other defects. 9.1.1 Rods/Bars Other than Rectangular 7 NOITIDNOC YLPPUS~FO roF lairetam revo 30 mm ,retemaid ssenkciht or htdiw ehT lairetam llahs eb deilppus ni yna eno of the across ,stalf the test eceip llahs eb denrut htiw sti ertnec elbaT 1 lacinahceM seitreporP (Clause 9.1) Diameter, Width Condition Tensile Strength Elongation on 5.65 ,& Hardness Across Flats or (for all Thickness of Gauge Length Shanes) * r . , h \ revO otpU dna dnuoR erauqS dna -tceR dnuoR erauqS dna -tceR gnidulcnI lanogaxeh ralugna lanogaxeH ralugna aPM aPM aPM tnecreP tnecreP tnecreP (1) (2) (3) (4) (5) (6) (7) (8) (9) 6 01 052 Max - - niM23 - - 01 21 0 240 Mm 042 Max 042 MUX 04 Min 40 Min 04 Min 21 05 230 MUX 230 Mar 230 Mm 45 Min 45 Min 45 Min + ~OMUX 05 09 230 Mar 230 Mar - 45 Min 45 Min - revO 09 * * * * * * 6 10 280 Min - - 8 Min - - 10 12 BH 062 Min 260 Min 250 Min 12 Min 12Min 12 Min 12 25 250 Min 250 Min 230 Min 18 Min 18 Min l8Min 07 ot 09 25 50 230 Min 230 Min 230 niM 22 niM 22 niM 81 niM 05 09 032 Min 230 Min - 22 Min 22 Min - revO 09 * * * * * * I 6 10 330 Min - - - 10 12 DH 023 Min 310 Min 270 Min 6 Mire 6 Min 8 Min 12 25 290 Min 280 Min 260 Min 8 Min 8 Min 8 Min 90 Min 25 90 260 Min 250 Min 250 Min 12 Min 21 Min IOMin revO 09 * * * * * * * sA deerga ot neewteb eht resahcrup dna eht .grutcafunam 2 SI 613 : JO00 14.0 mm morf the ecafrus of the .lairetam lairetam-roF 11.1.1 Direct Measurement on the Test Sample of rellams retemaid or htdiw hcihw yam ton detset~eb ecnatsiseR stnemerusaem llahs eb denimreted noc ni the noitidnoc as erutcafunam of the test eceip llahs snemiceps of the rod after ,gninaelc tub tuohtiw rehtruf eb denrut morf the ertnec of the .lairetam gnissecorp dna .gnilaenna 9.1.2 Rectangular Bars/Rods fI tcerid tnemerusaem of lacirtcele ytivitsiser si ton ehT test eceip llahs eb nekat morf the ertnec of the elbissop no the elpmas as deviecer noitidnoc eud ot .rab/dor rehgih elpmas ,ezis ,ylevitanretla dohtem of gnirusaem lacirtcele ytivitcudnoc ni tnecrep ,SCAI gniyolpme 9.2 Bend Test ydde tnerruc eborp yam eb deilppa ni ecalp of lacirtcele ytivitsiser dna the lacirtcele ytivitcudnoc seulav ehT lairetam llahs eb tested for dneb test ni ecnadrocca as ,deniatbo tsum ylpmoc htiw the seulav nevig ni htiw SI 1599, fi agreed ot neewteb the resahcrup dna elbaT 2 (see 11.2). the .rerutcafunam 11.1.2 Measurement on Test Sample After Annealing 10 SNOISNEMID DNA SECNARELOT ecnatsiseR tnemerusaem llahs eb edam no snemiceps 10.1 ehT snoisnemid dna secnarelot for ,dnuor ,erauqs of the rod after gninaelc dna gnissecorp nwod ot a ralugnatcer dna lanogaxeh srab/sdor llahs eb nevig ni retemaid of yletamixorppa 2.0 mm dna gnilaenna at elbaT 2. erutarepmet C°005 for 30 .setunim Other tnelaviuqe 10.2 ehT ecnarelot no htgnel of rab or rod, fi ordered gnilaenna dohtem yam eb .desu tseT snemiceps ni exact llahs-,htgnel eb nihtiw the stimil deificeps ni processed ot a retemaid other naht 2 mm yam eb desu elbaT 3. fi so .deificeps 10.3 ehT ssenthgiarts ro/dna esiwegde erutavruc llahs 11.2 ehT lacirtcele ytivitsiser nehw tested ni ton exceed 3 mm for yreve 1 000 .mm ecnadrocca htiw SI 3635 llahs ylpmoc htiw the eulav nevig ni elbaT 5. 10.4 suidaR on Edges (Square and ~Rectangular 12 GNILPMAS DNA AIRETIRC ROF Material) YTIMROFNOC fI the lairetam si deriuqer htiw desuidar edges, the suidar of erutavruc llahs eb as nevig ni elbaT 4. 12.1 Lot nI yna tnemngisnoc lla the copper srab/sdor of the 11 ELECTRICAL RESISTIVITY TEST emas grade lacimehc( ,)noitisopmoc ,ezis repmet dna 11.1 ehT lacirtcele ytivitsiser llahs eb derusaem rednu derutcafunam yb a elgnis mrif rednu yllaitnesse ralimis eno of the snoitidnoc nevig ni 11.1.1 or 11.1.2. snoitidnoc of noitcudorp llahs eb depuorg together ot etutitsnoc a .tol Table 2 Dimensions and Tolerances (Clauses 10.1 a& 11.1.1) llA snoisnemid in millimetres. Specified Diameter, Width Across Tolerance (Plus or Minus) Flats or Thickness / (c % / - . Over pU ot dna dnuoR )retemaiD( erauqS dna ralugnatceR raB gnidulcnI lanogaxeH doR htdiW( ro )ssenkcihT htdiW( ssorcA )talF (1) (2) (3) (4) (5) 6 01 50.0 - - 01 21 50.0 80.0 70.0 21 52 80.0 01.0 01.0 52 05 21.0 61.0 41.0 05 08 81.0 52.0 08 001 * * 52.0 001 061 * * * 061 003 * * * * sA deerga ot neewteb eht resahcrup dna eht .rerutcafunam 3 SI 613 : 2000 elbaT 3 secnareloT no htgneL of Bar doR ni scitsiretcarahc llahs eb deredisnoc as .evitcefed fI the thgiartS htgneL rebmun of sevitcefed dnuof si ssel naht or lauqe ot the PSUUlC( 10.2) elbissimrep rebmun of sevitcefed nevig ni co1 3 of elbaT 6, the tol llahs eb deredisnoc as gnimrifnoc ot llA snoisnemid ni .sertemillim the stnemeriuqer of these .scitsiretcarahc Length of Bar/Rod Tolerance elbaT 6 elacS of gnilpmaS dna elbissimreP Observed in Exact Length (Plus or Minus) rebmuN of sevitcefeD Y A Over pU ot dna sesualC( 12.1.1, 12.2.1 and 12.2.2) gnidulcnI (1) (2) (3) No. of Bars/ No. of Bars/ Permissible No. of Bars/ - 051 2.1 Rods ni a toL sdoR ni eht .oN fo sdoR for Copper 051 1 002 5.1 Sample Defectives Content, I 002 2- 004 5.2 Tensile Test and 2 004 - 0.5 Electrical Test (1) (2) (3) (4) elbaT 4 renroC suidaR dna secnareloT up ot 001 5 0 2 esualC( 10.4) 101 ot 003 31 1 3 103 ot 500 20 2 4 llA snoisnemid ni .sertemiilim 501 to 1 000 32 3 5 1001 0003ot 05 5 6 Thickness Corner Tolerance h ~ Radius (Plus or Minus) evobadna1003 08 7 7 Over pU ot dna gnidulcnI 12.2.2 morF each tol the rebmun of srab/sdor ot eb (1) (2) 13( (4) detcejbus for the noitanimreted of copper tnetnoc 6 52 5.2 52.0 (see S), elisnet test (see 9.1) dna lacirtcele ytivitsiser 52 05 2.3 52.0 test (see 11) llahs eb ni ecnadrocca htiw co1 1 dna 4 of 05 - * - elbaT 6. enO noitanimreted of lla other stnemeriuqer * sA deerga ot neewteb eht resahcrup dna eht .rerutcafunam of lacimehc noitisopmoc (see 8) llahs eb enod for each tol evitcepserri of the ezis of the .tol ehT sdor/srab for these tests llahs eb detceles tuo of those deniatbo elbaT 5 lacirtcelE ytivitsiseR ni 12.1.1. esualC( 11.2) ehT-ETON lairetam deriuqer rof lacimehc sisylana morf hcae Condition Measured by the Resistivity Conductivity fo eht sdor dednetni rof gnitset llahs eb detcelloc ni ecnadrocca Method Given ohm mm*/m WCS) htiw IS .7181 in Clauses at 20°C Max Percent, Min 12.2.2.1 nI the case of noitanimreted of copper (1) (2) (3) (4) ,tnetnoc elisnet test dna lacirtcele ytivitsiser test, the delaennA 1.1.11 ro 2.1.11 710.0 73 52.99 tol llahs eb deredisnoc as gnimrofnoc ot drah-flaH dna 1.1.11 ro 2.1.11 710.0 77 0.79 the stnemeriuqer of siht dradnats fi lla the test stluser draH no tnereffid selpmas yfsitas the gnidnopserroc ehT-ETON tnatsnoc rof gnitrevnoc eht ecnatsiser ta suoirav .stnemeriuqer erutarepmet ot eht ecnatsiser ta dradnats erutarepmet fo C°02 dna slacorpicer eseht stnatsnoc rof gnitrevnoc ecnatsiser ta C°02 ot 12.2.2.2 ehT tol llahs eb deralced as gnimrofnoc ot ecnatsiser ta rehto erutarepmet rof delaenna dna nward-drah -hgih the tnemeriuqer of other stneutitsnoc fi elgnis-eht test ytivitcudnoc copper era nevig ni xennA .B tluser of lacimehc sisylana deniatbo for each tneutitsnoc yfsitas the gnidnopserroc tnemeriuqer of 12.1.1 stseT for gninimreted the ytimrofnoc of the tol the .dradnats ot the stnemeriuqer of siht dradnats llahs eb deirrac tuo no each tol .yletarapes ehT rebmun of sdor/srab 12.3 Retest ot eb detceles for siht esoprup at modnar revo the elohw tol llahs eb ni ecnadrocca htiw co1 1 dna 2 of elbaT 6. 12.3.1 fI the test stluser of lacimehc sisylana sliaf ot yfsitas the stnemeriuqer for yna of the ,stneutitsnoc 12.2 rebmuN of stseT dna airetirC for ytimrofnoC two erom tests for that tneutitsnoc llahs eb enod no 12.2.1 ehT srab/sdor detceles ni ecnadrocca htiw co1 the emas elpmas ni order ot taht~mrifnoc the sisylana 1 dna 2 of elbaT 6 llahs eb detcepsni for modeerf morf has neeb enod .ylreporp fI htob the test stluser yfsitas defects (see 6) dna snoisnemid (see 8). ynA rab/dor the tnaveler ,stnemeriuqer the tol lla*ls eb deredisnoc gniliaf ot teem the tnemeriuqer of eno or erom of these as gnimrifnoc ot the siht ,dradnats esiwrehtlc .ton 4 SI 613:2000 12.3.2 fI the test stluser no yna elpmas for elisnet test tol ,rebmun date of erutcafunam dna yna hcus dna lacirtcele ytivitsiser test, liaf ot yfsitas the noitamrofnI deriuqer yb the .resahcrup stnemeriuqer for yna of the seitreporp~lacinahcem dna 14.1.1 ehT lairetam yam osla eb dekram htiw the lacirtcele ,ytivitsiser two erom tests llahs eb enod no dradnatS Mark. the elpmas detceles morf the emas .tol fI htob the test stluser yfsitas the tnaveler stnemeriuqer the tol llahs 14.1.2 ehT esu of dradnatS Mark si denrevog yb the eb deredisnoc as gnimrofnoc ot siht ,dradnats noisivorp of the Bureau of Indian sdradnatS Act, 1986 esiwrehto .ton dna the seluR dna snoitalugeR edam there .rednu ehT sliated of the snoitidnoc rednu hcihw the ecnecil for 13 GNIKCAP the esu of dradnatS Mark yam eb detnarg ot ehT lairetam llahs eb packed ni ,seldnub ,sexob cases srerutcafunam or srecudorp yam eb deniatbo morf or crates so as ot erusne the safe noitaropsnart of the the uaeruB of naidnI .sdradnatS- lairetam dna diova egamad ni .tisnart 15 NOITAMROFNI OT EB NEVIG BY EHT 14 GNIKRAM RESAHCRUP sihT dradnats sniatnoc a rebmun of sesualc ni hcihw 14.1 Each package tagged htiw elbatius latem tag the resahcrup si dewolla ot esicrexe na .noitpo ehT llahs raeb the gnikram edam no meht htiw the grade tsil of noitamrofni ot eb nevig yb the resahcrup ni of ,lairetam eman of the ,rerutcafunam the ,ssam ,ezis respect of these sesualc si nevig ni xennA .C ANNEX A (Chse 5.1) LANOITANRETNI DRADNATS ROF DELAENNA YTIVITCUDNOC-HGIH REPPOC l-A DRADNATS SEULAV ehT-ETON evoba eulav rof eht tneiciffeoc fo raenil noisnapxe yam eb deilppa ot delaenna reppoc revo a erutarepmet egnar fo 0.1-A ehT gniwollof seulav dexif yb the lanoitanretnI 0 ot .c’o51 lacinhcetortcelE noissimmoC for dradnatS‘ delaennA 4.l-A tA a erutarepmet of C°02 the tneiciffeoc of Copper’ evah neeb nekat as dradnats seulav for noitairav of ecnatsiser htiw erutarepmet of dradnats delaenna ytivitcudnoc-hgih copper. delaenna copper erusaem neewteb two laitnetop stniop 1.l-A tA a erutarepmet of C°02 the emulov ytivitsiser yldigir dexif ot the ,eriw the latem gnieb dewolla ot of dradnats delaenna copper si 85/l (or 0.0 17 nrho)....,,,142 .m/2mm dnapxe ,yleerf si 0.003 93 (or .C01]....5i,452 2.l-A tA a erutarepmet of C°02 the ytisned of dradnats delaenna copper si 8.89 .3mc/g 5.l-A tI swollicf morf 1.l-A dna 2.l-A that at a foerutarepmet C°02 the ssam ytivitsiser of dradnats 3.l-A tA a erutarepmet of C°02 the tneiciffeoc of 1 raenil noisnapxe of dradnats delaenna copper si delaenna copper si 58 X 8.89 = 0.153 23 mho .m/m/g 0.000 .C“/710

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