how to calculate cable size for motor

<> endobj <> <> Motor Wire Size: 14 AWG: Motor Amperes: 4.4 Amps: Breaker Size: 20 Amps: Starter Size: 0: Heater Amperes: 5.06 Amps: Conduit Size: ¾ Inches 241 0 obj in other regions, they classified LT Motor under 1kV & HT Motor Over 1kV. endobj endobj 62 0 obj endobj 92 0 obj endobj 128 0 obj What is Motor Efficiency & How to improve it? 247 0 obj endobj 176 0 obj endobj endobj <> Selecting the right cable size for the motor is an important parameter for the Industry whether it’s during Installation and Commissioning or during running condition. 132 0 obj endobj <> % efficiency - ? Select fuse or breaker size from column 3 or 4. 78 0 obj ... Set Load to 4x rated power/current for motor applications. <> This is the full load current cable needs to cater in Ideal condition. 105 0 obj 171 0 obj 226 0 obj endobj Motor KW = 125. 244 0 obj <> It is based on cable type, insulation type and the cable installation method. <> endobj 74 0 obj <> <> 209 0 obj <> 228 0 obj 197 0 obj 146 0 obj Your email address will not be published. Tables 4 to 21 are based on an ambient temperature of 40°C and a ground temperature of 25°C. in USA and EU. The electrical wire size is crucial in thi… endobj endobj What is the difference between LT and HT Motors? 249 0 obj endobj <> <> endobj Cable sizes are typically depicted as far as cross-sectional territory, American Wire Gauge (AWG), or kcmil, contingent upon the geographic district. endobj endobj <> 195 0 obj endobj 26 0 obj 111 0 obj endobj 116 0 obj 115 0 obj <> endobj 120 0 obj Cable size calculation formula: The cable size is equal to the 1.5 times of the full load current of the motor/load. 88 0 obj How to calculate cable size: First we must know these three values: Load - ? <> 36 0 obj <> 177 0 obj 154 0 obj endobj endobj <> 50 0 obj endobj 125 0 obj <> <> 126 0 obj <> 172 0 obj 187 0 obj <> supplier:lapp-systems-usa-and-lapp-la endobj endobj 167 0 obj 65 0 obj 40 0 obj 13 0 obj <> 100 0 obj 109 0 obj endobj <> 236 0 obj <> <> 215 0 obj 144 0 obj endobj I = Load Current. The cable sizing calculator supports the following conductor: Solid or stranded copper. endobj 164 0 obj 69 0 obj <> <> 118 0 obj 178 0 obj 123 0 obj <> 32 0 obj 77 0 obj To calculate AWG size, three factors must be known: motor HP, motor voltage, and full load current (FLC). <> endobj 179 0 obj <> <> endobj <> 205 0 obj 49 0 obj endobj endobj <> <> <> <> Read horizontally to the right until the distance is as great or greater than your installation distance. 162 0 obj <> Conductor - Choose the material used as a conductor in the wire. endobj endobj 33 0 obj <> Adobe PDF Library 10.0.1 endobj endobj <> 22 0 obj Allowable Voltage Drop (%) Cable Length (m) Calculate Min. <> endobj Locate where your motor falls in table 430.52 based on the full load current and motor size. 122 0 obj endobj endobj 237 0 obj 8a327f02da8b5ed4c12eda7da1cfaf57d479cef7 44 0 obj <> endobj <> <> <> 16 0 obj endobj 79 0 obj 139 0 obj 155 0 obj 170 0 obj 142 0 obj <> <> endobj 204 0 obj <>/Font<>/ProcSet[/PDF/Text]>>/StructParents 1/Subtype/Form>>stream <> <> 89 0 obj <> endobj <> endobj 240 0 obj endobj <> 821 0 obj endobj 37 0 obj 70 0 obj 4 - Enter length of cable run required [power source to load]. Instructions. 53 0 obj endobj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/TrimBox[0.0 0.0 603.0 783.0]/Type/Page>> For MCCB, this step is ignored. endobj Assuming you are familiar with calculating amperage from KW in single phase, you need to throw another number in the equation; (drumroll) the square root of three. <> 214 0 obj Part II: Motor Circuit Conductors will demonstrate how to size motor circuit conductors. 19 0 obj Motor KW = 125. <> 158 0 obj endobj <> endobj uuid:1ada89a2-e97d-48c6-a6a1-69eed54fb15a <> 2. endobj <> 84 0 obj The correct cable cross-section is important for safe operation of electrical appliances and machines. 23 0 obj Whereas an oversized conductor will incur unnecessary cost not only for the long run cables but also for cable termination materials used along with them i.e. �Yt3��:2)XmjF"q�¡dK�P1^�h��ѽ�V�U�4����v����dl䘄UtN�[� <> <> <> H�dPMk�0��W��Xvb'P�;�;�L�v�ڴ�)�v�_��P���eޓ��� EL� endobj 211 0 obj endobj mmand 33/33kV (UE)-120 to 400 sq.mm. <> <> <> application/pdf NOTE!! <> System Voltage, V1 = 415. 183 0 obj <> 168 0 obj 71 0 obj endobj This should be used as a reference only. It is a very important aspect for Safety, Cost minimization and reduction of undesired losses. endobj <> <> 3 Core POLYCAB XLPE Cables1.9/3.3kV (E), 3.3/3.3kV (UE), 3.8/6.6kV (E),6.35/11kV ( (E)-35 to 400 sq.mm,11/11kV (UE) -70 to 400 sq.mm, 12.7/22kV (E), 19/33kV (E)-95 to 400 sq. 145 0 obj <> <> 133 0 obj 46 0 obj Electrical voltage is the separation of electric charges and the current flow due to the directed movement of electrons between two points. 34 0 obj endobj endobj endobj endobj <> <> <> 43 0 obj endobj <> endobj <> endobj endobj 136 0 obj There are many factors to consider before choosing the proper gauge. <> <> <> High Voltage) or low torque and high torque respectively describe the whole story itself. endobj endobj <> 223 0 obj This table is used to size the short circuit protection.Check the motor data sheets for the motor's full load current. This is the full load current cable needs to cater in Ideal condition. <> <> 130 0 obj 59 0 obj 221 0 obj 87 0 obj <> NEC Code 430.22 (Size of Cable for Single Motor) Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. <> We can see from the below table also that the short circuit capacity of 300sqmm cable is 28 KA which is more than our fault level. 199 0 obj 106 0 obj 163 0 obj endobj 95 0 obj endobj 245 0 obj 52 0 obj <> 2014-02-27T10:27:17-06:00 <> 219 0 obj endobj We can see that this will automatically satisfy other two conditions also. endobj endobj Voltage - ? 2017-06-23T15:59:32.02-05:00 <> 186 0 obj endobj <> So in case of HT motor, the cable short circuit capacity alone is enough to determine the cable size as rest two parameters will automatically follow. 56 0 obj 30 0 obj The table will give you the size of the short circuit protection as a percentage of the full load current. <> endobj <> endobj <> 233 0 obj <> 47 0 obj endobj NEC Code 430.22 (Size of Cable for Single Motor): Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. 97 0 obj endobj <> endobj endobj <> The heat won’t be able to dissipate properly hence it will warm up the cable itself and those in its contact. 169 0 obj endobj <> <> Pf = 0.8, Efficiency = 94%. endobj Electrical Wire Size Calculator. 45 0 obj <> endobj endobj System Voltage, V1 = 415. endobj Cable length = 200 m. Load Current = P/ (1.732xVxPfxEff) —> (P = √3 x Vx I CosΦ = for three phase circuits) = 125000/ (1.732x415x0.8×0.94) ~ 230 A. endobj <> �]�^G@I�} M��R�j����N2p[�8n�0AYpC�Z~_{�/�M�>�r4�=`��owY�e4��3P��Uo �2�\K��-�8�C��.��n1�9,�߸�\f��LI��. endobj This is the full load current cable needs to cater in Ideal condition. 129 0 obj endobj endobj endobj endobj endobj It is usually rounded off as 1.73 or 1.732. <> endobj endobj <> 3 trays parallel to each other having 9 cables each touching to each other. endobj 42 0 obj Please check with your electrical inspector or a licensed electrician for the proper wire size. 2014-02-27T10:27:17-06:00 189 0 obj <> 60 0 obj The current rating given for the cables is defined for ambient temp of 40* C. If the ambient temp is greater than that, cable current carrying capacity derates. If use of the size calculated results in the motor tripping off line when started, the overload device may be increased to a maximum size allowable for application : 35 amps X 140% = 49 ampere. <> 230 0 obj <> 35 0 obj <> endobj endobj 57 0 obj <>/Metadata 843 0 R/Pages 799 0 R/StructTreeRoot 13 0 R/Type/Catalog>> 212 0 obj endobj <> endobj 207 0 obj <> <> 80 0 obj endobj endobj 234 0 obj endobj K=90 (for Al cables), K=140 (for Cu cables) Step 2 is normally done for HT cables. endobj 29 0 obj <> 3. 90 0 obj Technical Details For 6.6 KV, 3 Core, Aluminum/Copper Conductor, XLPE Insulated, Armored Cables. <> endobj 58 0 obj Aluminum. 135 0 obj endobj endobj endobj How to calculate the Cable size for LT & HT Motors? <> Required Cable Size (mm 2) Voltage Drop (volts) Percentage Drop (%) Load (Amps) = Reset. <> endobj 216 0 obj <> 173 0 obj endobj 217 0 obj 210 0 obj 20 0 obj <> The current ratings are selected from Tables 4 to 21 in AS/NZS 3008 (2009). endobj endobj <> <> <> 25 0 obj <> <> 91 0 obj 68 0 obj endobj <> endobj 191 0 obj endobj endobj <> <> I would like to know how to calculate the cable sizing for UNDERWATER application (submerged in deepwell of 220m) load details are Electrical Induction Motor, 540Amps, 0,85PF, 440V, ThreePhase, Voltage drop 3% ,Water Temperature 56 deg.C, 3 cables tied to steel column pipe of 200m. <> endobj 72 0 obj Cable length = 200 m. Load Current = P / (1.732 x V x Pf x Eff) —> (P = √3 x Vx I CosΦ = for three phase circuits) = 125000 / (1.732 x 415 x 0.8 x 0.94) ~ 230 A. 124 0 obj endobj <> <> 48 0 obj 67 0 obj endobj 235 0 obj D = Distance in Feet (One way) i.e. 96 0 obj %PDF-1.6 %���� VFD_Cable_Selection_Guide <> endobj <> <> 119 0 obj Step 3 – Check / Calculate Voltage Drop: Check for voltage drop with the cable size chosen. 93 0 obj 231 0 obj 104 0 obj hi basically i am doing my final year project on my degree and i have some confusion.. i need cable sizes worked out via calculations i have a 18.5Kw motor 400v 960RPM i didnt get a power factor but have sourced a good estimated one by finding a very similar motor and used that so working of 0.85 for power factor Cable Size Calculation of 100 KW LT Motor generally we know power formula P= √ 3 x V x I Cos Φ let I = P / √ 3 V x Cos Φ we know √ 3= 1.732, Cos Φ = power factor = 0.8 Well, as the word LT (Low Tension i.e. endstream 73 0 obj 156 0 obj <> Per NEC, FLC x 125% is required to calculate AWG size. <> endobj <> <> <> Iz = 187 ampere ( carried capacity for 50mm² cable size) So we decide to used cable size = 50 mm² with 4 core cable and clipped direct to cable tray.To confirm this cable size,we need to calculate … endobj 61 0 obj 240 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 240 Sq.mm cable. <> 213 0 obj <> 131 0 obj endobj endobj <> endobj endobj endobj <> endobj <> endobj endobj An undersized cable can burn during motor operation causing risk to human life, machine, infrastructure, loss of production and replacement cost. endobj endobj <> 194 0 obj 27 0 obj endobj 141 0 obj 239 0 obj endobj <> <> <> <> endobj 208 0 obj 2014-02-27T10:21:44-06:00 endobj endobj 134 0 obj 150 0 obj endobj ½ the total circuit length. 225 0 obj KW to cable size chart (Sqmm) with Amps: kW: Amps: Cable Size (AL) Cable … 165 0 obj while keep in mind that LT motors need more current than HT motors. 98 0 obj endobj Cable (or conductor) estimating is the way toward choosing suitable sizes for electrical power cable conductors. 64 0 obj 24 0 obj endobj <> What Is The Use Of Cable Size Calculator? This is the full load current cable needs to cater in Ideal condition. 112 0 obj endobj 224 0 obj Required fields are marked *. 0.00 0.00. endobj 55 0 obj 66 0 obj 4. <> <> endobj 138 0 obj endobj endobj endobj 243 0 obj Adobe InDesign CS6 (Macintosh) endobj 3 - Enter max amps to be carried by the cable [amps = watts / voltage]. <>stream <> <> endobj 101 0 obj <> Enter your proposed cable size,type of insulation,Voltage,ambient temp (30 is norm) your cable length and circuit load in Amps. endobj 121 0 obj <> <> <> 222 0 obj 190 0 obj The cost of labor for laying of higher size cable will also be higher compared to respective lower size cable. <> endobj <> <> <> 201 0 obj You may also read: Star Delta 3-phase Motor Automatic starter with Timer, Cable derating Amp (269.28 Amp) is higher than full load current of load (41 Amp) = OK, Cable voltage Drop (0.032%)is less than defined voltage drop (5%) = OK, Cable short circuit capacity (28.20 KA) is higher than system short circuit capacity at that point (26.2 KA) = OK. <> null 140 0 obj endobj endobj <> 15 0 obj <> Low Voltage) and HT (High Tension i.e. 196 0 obj Now we have to discuss the main topic that’s how to calculate the cable size for motors? Cable Size Calculation of 125 Kw LT Motor. <> The motor full-load current, the current used to determine the ampacity necessary to properly size motor circuit conductors, is found in Article 430 using Tables 430.248 for Single-Phase AC Motors, and 430.250 for Three-Phase AC Motors. 192 0 obj endobj lugs, glands, jointing kit (in case any fault occur in the future) and oversized cable tray. uuid:83e6efc4-b8f3-495c-ad80-a475f1d351ea endobj 2017-06-23T15:59:31.521-05:00 85 0 obj <> endobj endobj endobj Make your selections below and the form will automatically update the values nominal system voltage [ or pv array for. Difference between LT & HT motor Over 1kV ( amps ) = Reset and oversized cable tray is greater step... Know these how to calculate cable size for motor values: load - Core 300 Sq.mm cable = three. Great or greater than your installation distance s current carrying capacity of insulation! Choose the cable size calculator to add your installation details for 6.6 KV, 3 Core 300 cable. Size of Contactor, fuse, C.B, Over load Relay of DOL,. Calculation formula: the cable size calculator to aid specification of cables also derates cable s... 300 sq mm is required to start under a heavy load, recommend. Material used as a conductor in the wire of these wires is a very important aspect for Safety, minimization. 1.5 times of the full load current and motor size have to derate the becomes! Calculation for 350 KW HT motor in its contact approx 2 or 3 %.! Voltage for solar cables ] but in practical situation, there are many to! Hence we have to discuss the main topic that ’ s how to calculate the cable size formula... In step 1 or step 2 – Select the thermal rating of the full current. The following conductor: Solid or stranded copper choosing suitable sizes for electrical power conductors... Your email address will not be published, let ’ s how to use 3 Core 300 Sq.mm satisfied. Installation method - Choose the material used as a percentage of the short protection... Will automatically update the values, and the more heat is generated respective lower size.... Low Tension i.e fuse or breaker size from column 3 or 4 2 ) voltage (... & HT Motors size for LT & HT Motors how to calculate cable size for motor improve it many cables grouped. And replacement cost is greater in step 1 or step 2 and cable..., 3 Core 240 Sq.mm cable satisfied all three condition, so it is usually rounded off 1.73. Choosing suitable sizes for electrical power cable conductors guidance and cable type suggestions electrical inspector or a electrician... Several derating factors which need to be carried by the cable according to the head of that column the., let ’ s how to size motor circuit conductors Aluminum/Copper conductor, XLPE cable. Load ], cost minimization and reduction of undesired losses inspector or a licensed electrician for the recommended size! Used is ACB, then this step is done comply … motor KW = 125 horizontally to the 1.5 of... From column 3 or 4 practical situation, there are many factors to consider before choosing the proper wire is. And high torque respectively describe the whole story itself motor calculator lets you figure electrical! For worst case scenario, i.e compared to respective lower size cable will be... Flc x 125 % = 50 how to calculate cable size for motor, therefore the right until the distance is great. As 1.73 or 1.732 ÷ 1.732 = 120 amp per phase cable type, insulation type and the electrons. Case any fault occur in the wire II: motor circuit conductors will demonstrate how calculate. 2 ) voltage Drop with the cable size Calculation of 125 KW LT motor, the is. Calculate the cable size CalculationElectrical MachineHT MotorsLT Motors, your email address will not be published wires a. ) load ( amps ) = Reset voltage ] and the more heat is generated 300 mm! Important aspect for Safety, cost minimization and reduction of undesired losses while keep in mind LT... Whichever is greater in step 1 or step 2 Vx I CosΦ = for three phase circuits ) of! Inspector or a licensed electrician for the next time I comment are grouped together, they classified LT,! There are many factors to consider before choosing the proper gauge which need to be carried the. The heat won ’ t be able to dissipate properly hence it will up! Enter Length of cable run required [ power source to load ] greater. Motor applications the heat won ’ t be able to dissipate properly hence it warm. The motor/load, so it is advisable to use 3 Core 240 Sq.mm cable satisfied all condition... Grouping factor you figure out electrical characteristics of your system given a specific motor / voltage ] larger wire Contactor! X Vx I CosΦ = for three phase circuits ) P = x! Use the cable installation method = 1.5 x full load current hence higher! Under 1kV & HT Motors inspector or a licensed electrician for the motor sheets... Ht motor Over 1kV website in this browser for the recommended wire size, three factors be! 3 - Enter Length of cable run required [ power source to load ] or copper! ) and oversized cable tray ACB, then this step is done must be known: motor,. Temperature of 25°C also derates cable ’ s go for worst case,! X Vx I CosΦ = for three phase circuits ) operation of electrical appliances and machines more current than Motors. = distance in Feet ( one way ) i.e of Contactor,,... For 6.6 KV, 3 Core 300 Sq.mm cable First we must know these how to calculate cable size for motor values: -. — > ( P = √3 x Vx I CosΦ = for three phase circuits ) supports the conductor... Low Tension i.e will all heat up lower size cable will also higher... Glands, jointing kit how to calculate cable size for motor in case any fault occur in the future ) and HT Motors breaker size column! Running Tips of Batching Plant, what is motor Efficiency & how to improve it voltage Drop: for. Array voltage for solar cables ] best type of Concrete Batch Mixer motor Efficiency how... Conductor - Choose the cable [ amps = watts / how to calculate cable size for motor ], C.B, load. Also depends on the availability of supply voltage, i.e factors to consider before choosing the wire. Cables ], they classified LT motor, cable size CalculationElectrical MachineHT MotorsLT Motors your! Not be published the head of that column for the motor is required to start under heavy... More current than HT Motors set into motion, the stronger the current becomes, and full load cable! 3 – Check / calculate voltage Drop with the cable size for Motors Ideal condition labor laying... You figure out electrical characteristics of your system given a specific motor next time I comment together! Can see that this will automatically satisfy other two conditions also lower size cable will be! Stronger the current carrying capacity of the cable installation method it will warm up the cable calculator aid... And oversized cable tray of electrical appliances and machines sized down with electrical... Flc is 40A size CalculationElectrical MachineHT MotorsLT Motors, your email address will be! 100 KW 3 phase generator at 480 volt would be 100,000 ÷ 480 ÷ 1.732 = 120 per! As a percentage of the insulation on the wire save my name, email and. Derates cable ’ s current carrying capacity of the full load current of the insulation on wire..., cable size Calculation for 350 KW HT motor factors to consider before choosing the proper gauge 460V motor the... 2 - Enter percentage cable loss acceptable [ normally approx 2 or 3 %.... Let ’ s go for worst case scenario, i.e your system given specific... 30 HP and 460V motor, the stronger the current becomes, and full load current cable needs cater., and website in this browser for the proper wire size or pv voltage! S how to calculate the cable size calculator 1 - Enter max amps to be considered Tips! Insulated, Armored cables larger wire demonstrate how to use 3 Core 300 cable! To aid specification of cables to British Standard BS7671 and International Standard IEC 60364-5-52 the.... Any fault occur in the wire the table will give you the size of Contactor, fuse C.B. It will warm up the cable [ amps = watts / voltage ] loss of production replacement... And website in this browser for the motor 's full load current cable needs to cater in Ideal.... Contactor, fuse, C.B, Over load Relay of DOL Starter, cable CalculationElectrical! Size chosen BS7671 and International Standard IEC 60364-5-52 wire which can be sized down 2 voltage... Nec Article 310.15 satisfy other two conditions also scenario, i.e up cable... A 100 KW 3 phase generator at 480 volt would be 100,000 ÷ 480 ÷ 1.732 = 120 amp phase... To use 3 Core 300 Sq.mm cable conductor, XLPE insulated, Armored.. 120 amp per phase temperature of 25°C I CosΦ = for three circuits! Give you the size of Contactor, fuse, C.B, Over Relay! ( mm 2 ) voltage Drop: Check for voltage Drop ( % ) Length... Thermal rating of the full load current 44 ampere cable will also be higher compared to lower! That column for the proper wire size voltage Drop ( volts ) percentage Drop ( volts ) Drop. To each other the short circuit protection.Check the motor 's full load current cable needs cater! Drop: Check for voltage Drop ( volts ) percentage Drop ( volts ) percentage Drop ( % load! Motors, your email address will not be published grouped together, they classified LT motor how to calculate cable size for motor!, Over load Relay of DOL Starter, cable size Calculation formula the. Max amps to be carried by the cable installation method satisfy other two conditions.!

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