1 MEDIUM VOLTAGE CABLESUp to and including 36 KV NOTICEAs this catalogue is not intendedto cover all of LIBAN CABLES SAL possibilities inspecial cables manufacturing, the hereafter listing of the types of cables is not retrictivebut only indicative of the main and most current types we the other hand, our specification sheets are inspired mainly from InternationalElectrotechnical Commision Specification (IEC) only in order to conform with thesustained trend, noticed both regionally and worlwide, towards these same IECsupposed to inspire any further standardization , in facts some special cables may require special conception, fully within thecapabilities of LIBAN CABLES SAL, ISO 9001 certified, precisely because inposition to conceive / tailor your special is why, while consulting this brochure, it is important to take into account that anycombination or change of the constructional details mentioned in this catalogue remainfeasible, on base of special conception / development, matching any special or , and within our policy of constant improvement, we reserve the right to alter anypart of the information contained in this publication without incurring any all cases this brochure being only indicative, and unless expressly agreed upon.
2 Itcannot be considered by any mean as contractual document. 6 1 INTRODUCTIOND evoted to the manufacturing of electric and telecomcables, Liban Cables is the first and largest supplier inLebanon and a leader in the Middle-East Cables was founded in 1968 by a group ofLebanese industrialists backed up by the technicalassistance of two international leading firms :- Les Cables de Lyon - France- Phelps Dodge - with qualified engineers and highly skilledtechnicians, our plant is located in Nahr-Ibrahim at 30Km from Beirut, where cables are designed andmanufactured according to all internationalspecifications : IEC, VDE, UTE, BS, and others oncustomer after its foundation, Liban Cables has become themajor supplier of the Lebanese market in both thepublic and private sectors. The product range of LibanCables covers all electric cables up to 245 KV,communications cables (copper and optical fiber) inaddition to a wide variety of special cablesmanufactured on customer quality cables, continuous developments of theproduction range, direct and fast shipments havecontributed in rendering Liban Cables an importantexporter for many countries on the three limitrophecontinents (Asia, Europe, Africa).
3 Liban Cablesproducts are particularly appreciated by administrationsand international contractors operating in the region andseeking reliable and direct supplies of power andcommunication cables. 7 ASSURANCERECOMMENDED ORDERING PARAMETERSGENERALITIES :Choice of voltageDetermination of the cross sectional areaCurrent carrying capacitiesBuried cablesCables laid in the airInductanceCapacitanceConductors short circuit currentScreen short circuit currentMinimum bending radiusOUR TYPE AND CODE DESIGNATIONSINGLE AND THREE CORE MEDIUM VOLTAGE CABLESA ccording to international standard IEC ( ) KV Cables, XLPE insulated, PVC or PE sheathedXLPE insulated, screened, PVC or PE sheathed cables forvoltages up to and including 36 Bundled overhead conductors (Torsade)12/20 (24) KV XLPETECHNICAL INFORMATIONF ormulaeConversion factors and units 5432176 2 Step by step, from raw material to final product, quality constitutes a major concern toLiban material are continuously and repetitively tested from trial orders till the last batchreceived addition to the final tests carried out on finished products, work in process is alreadytested within two simultaneous procedures.
4 - A built in quality control system carried out by the production itself at any step ofwork in A parallel and contradictory procedure is also carried out on the same stages andproducts by independent inspectors reporting to the quality control users and/or third part inspection authorities are also constantly commissioning thefinished products and assessing the strict conformity to ordered fact, our ISO 9001 certification stated in Feb 1997 by the International CertificationNetwork (EQNET) is certified by the French Association for Quality Assurance(AFAQ), the well known rigourous and independant accredited European certification, under reference AFAQ N QUAL / 1997 / 7034, confirms thesoundness and the performance of the Quality System we apply for the Design, theDevelopment, the Manufacturing and the Marketing & Sales of all our ORDERING PARAMETERSFor prompt quotation / supplies please make sure your inquiries and your orders aresecuring the following data :1 - International or special Standard.
5 (Alternatively, the precise usage of thecable.)2 - Rated - Copper or Aluminium - Size of each - Insulation material : XLPE or - Number and identification of - Other - - Required delivery - Required validity. 8 CHOICE OF VOLTAGEThe rated voltage is specified as Uo / U where :Uo is the rated voltage between conductor and screen or outer metallic the rated voltage between any two three phase systems Uo is U / 3 The voltage of the cable must be chosen according to the maximum voltage Um innormal working conditions, which must not exceed the rated voltage by more than 20%.The following table gives the maximum permissible operating voltage relative to eachrated voltage (Uo / U). DETERMINATION OF THE CROSS SECTIONAL AREAThe determination of the cross sectional area depends on the :- Current carrying capacities in continuous loading,- Permissible short-circuit current,- Conditions of installation (temperature, spacing.)
6 CURRENT CARRYING CAPACITIESThe heat produced by the cable under the set conditions must be able to dissipate to theambient environment at any point of the cable installation; therefore the loading of thecable must be limited accordingly. The current carrying capacities shown in theelectrical characteristics tables are calculated according to the internationally adoptedmethod of the IEC publication 60287 for a maximum core temperature of 90 C, at thefollowing installation conditions :4 GENERALITIESR ated voltageUo / U (Kv)Max. voltageUm (Kv) / / 66 / / 1512 / 2018 / BURIED CABLESThe stated values are for cables or ducts placed in the ground at a depth of 800 mm ofaverage thermal resistivity of 100 and spaced so that the temperature rise ineach duct has no effect on the other ducts ( space being greater than 1 meter ), for a soiltemperature of 20 the thermal resistivity is different (not 100 Ccm/w) the current rating shouldbe multiplied by the correction factors shown in the following of the soilSoil thermal resistivity wet dry soil05101520253035404550 Soiltemperature( C) core temperature ( C) factor for different soil thermal resistivityCorrection factor for different soil temperatureWhere the temperature of the soil is different (not 20 C) the current rating should bemultiplied by the following correction factors.
7 10 When several cables or ducts are laid underground with less than one meter spacing thecurrent rating values should be multiplied by the following correction factors :Number ofcircuitsTouchingcablesOne diameterspaced cablesa = = = = 2. CABLES LAID IN AIR :The stated values are for cables or ducts laid in air with an ambient temperature of30 C and out of direct sunlight, spaced so that the temperature rise of individual cableshas no influence on others. The spacing between adjacent cables is at least twice thecable or duct the ambient temperature is different ( not 30 C ) the current rating values shouldbe multiplied by the following correction factors :Ambienttemperature ( C)05101520253035404550556065707580859095 100 Carrying core temperature ( C) factor of proximity effect for underground cablesD = overall outer sheath diameter a = Space between cablesCorrection factor for different ambient temperatureSingle or multicore cables 11 When several cables or ducts are grouped, the current ratings values should be correctedas follows :aDHSINGLE CORE CABLESM ethodof layingTouchingOne diameterspaced cablesa = DNumber of layers123123 Number of cables inhorizontal layer3 cables intriangular formationMULTICORE CABLESM ethodof layingTouchingOne diameterspaced cablesa = DNumber of layers123123 Number of.
8 The space H between layers must not be less than InductanceThe Inductance L depends on the geometrical characteristics of the cable as well as thedisposition of conductorsfor unarmoured cables Conductors short - circuit current :Current densities given in the table below are in (A / mm2 ), for a maximum condutortemperature of 250 C at the end of the short - of conductorbefore overloadT ( C )20307090overload time in metalCurrent density ( A / mm2 )For an overload duration (t) different than those figured in the above table, thecorrespondant current density is given by the following formula :Current density for a duration (t) = Current density for 1 sec t L = + Log10 ( mH / Km )DmrSingle phase systemThree phase systemflat formationThree phase systemtrefoil formationDm = DDDm = 1,26 DDDDDDm = DFor armoured Cables increase the inductance of about 10% CapacitanceC = Lnd = Diameter of conductor ( including the eventual semi-conductive layer )D = Diameter of insulated ConductorDd116112103911124120103982where .
9 R = Conductor RadiusD = Distance between ConductorsD 13 Armoured single coreUnarmoured single coreArmoured multi coreUnarmoured multi coreCable on Screen short-circuit currentFollowing short-circuit current in Ampere, are approximative, calculated for coppertape screen of thickness applied helically with about 10% secondSpecified Voltage, KVNominal Conductorcross section1 second2 secondsin (18)12/20(24)18/30(36) (18)12/20(24)18/30(36) (18)12/20(24)18/30(36) Minimum Bending Radius :Listed values represent the permanent bending radius the cables withstand in fixedinstallation and on dispatching reels. Other constraints may impose greater duringinstallationInstalled Cable16 D20 D16 D16 D8 D10 D7 D8 DD = Overall diameter in mm8 D10 D7 D8 D 14 The type designation is a combination of abbreviations indicating the type, voltage andthe main constructional elements of the cable as follows :- The first symbol is the letter M for medium voltage cables- The second symbol is a number (n) from 1 to 6 indicating the voltage as follows ( ) ( )6/10 (12) (18)12/20 (24)18/30 (36)KVKVKVKVKVKV- The third symbol is a letter indicating the type of the metal as follows :N for copper conductorA for aluminium conductor- The fourth symbol is a number indicating the type of the screen as follows :1 for semi-conductor tape plus copper tape2 for semi-conductor tape plus copper wire3 for extruded semi-conductor plus copper tape4 for extruded semi-conductor plus copper wireNote.
10 For cables up to and including KV where the screen is not required, thisnumber is not The fifth, sixth and seventh abbreviations are eventual letters indicating the following :LBGRFAWFor lead sheathFor steel tape armouringFor galvanized steel tape armouringFor galvanized roumd steel wire armouringFor flat steel wire armouringFor aluminium tape armouringFor round aluminium wire armouring5 OUR TYPE AND CODE DESIGNATIONE xample :M3A1B- Medium voltage cable , 6/10 (12) KV, aluminium conductor,XLPE insulation, semi-conductor tape plus copper tapescreen, steel tape Medium voltage cable , 12/20 (24) KV, copper conductor,XLPE insulation, extruded semi-conductor plus coppertape screen, lead sheath, galvanized round steel wirearmour. 15 6 SINGLE CORE AND THREE CORE MEDIUM VOLTAGE ( ) KV CABLES XLPE INSULATED, PVC OR PE SHEATHED1. SCOPEThis specification covers single core cables and three core armoured orunarmoured cables, rated at ( ) KV conforming to IEC ConductorPlain, annealed electrolytic copper or Aluminium conductors, circular stranded,conforming to the applicable requirements of IEC InsulationXLPE thermosetting material conforming to the applicable requirements of IEC60502-1 ( flame retardant XLPE for specific applications ).