415 x 1.414 = 585V) to insure that you have the dielectric "strength" that the PWM waveform will place in the cables and motor winding with a safety factor added in. If motor is of 5 KW use cable of 6 mm. based on the voltage drop selected at 230 and 400 volts. How to Calculate the Battery Charging Time & Battery Charging Current – Example, Automatic UPS / Inverter Wiring & Connection Diagram to the Home. 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. For underground cable CU cable, for 350KW, 6.6 KV. The cable and wire sizing calculator calculates the required cable or wire size based on current rating and voltage drop according to the American National Electricity Code (NEC 2017). Voltage drop, V2 = 0.3 Volts/Km/Amp (as per Havell’s brochure) = 0.3x217x200/1000 = 13 V I thinks this is wrong, because sysatem voltage is 415v not 217v, So: V2=0.3x415x200/1000 = 24.9v Is that true Sir? Based on the electrician 15kw would be divided by 240volts to give you 62.5amps. (provided as a guide to the selection of suitable MEM control gear). Three Phase Motor Power & Control Wiring Diagrams, Electrical Wire & Cable Size Calculator (Copper & Aluminum), A Complete Guide About Solar Panel Installation. Wire Sizing Selection Tables. 1 of 2 Go to page. Enter the motor horsepower and voltage. We have changed the values. M. Maestro. who is wright. NO guarantee as to the accuracy of these values is given. The cost of labor for laying of higher size cable will also be higher compared to respective lower size cable. Not suitable for ring mains! Consider these points for calculating 3-phase 15 KW motor at supply voltage of 415V and at 0.8 p.f. This will raise the temperature further. Enter your proposed cable size,type of insulation,Voltage,ambient temp (30 is norm) your cable length and circuit load in Amps. Now we have to discuss the main topic that’s how to calculate the cable size for motors? I will go ahead based on the following: 50kW, 3 phase, 415V, AC induction motor, operating at a power factor of 0.85 Using the expression P= 1.732*V*i* p.f Current comes out to be 82A. Your email address will not be published. Please explain help me, For LT motor 125kw, Pf = 0.8, Efficiency = 94%, System Voltage, V1 = 415, Cable length = 200 m 1. Considering all these vital points it’s important to make an proper cable size calculation for our motor. Use the cable calculator to add your installation details for sizing guidance and cable type suggestions. Voltage - Enter the voltage at the source of the circuit. High Voltage) or low torque and high torque respectively describe the whole story itself. Wire Size Chart - Three Phase Motor Rating Cicuit Size Fuse Size Full Load Amps Copper Wire Size Volts HP KW 12 10 8 6 4 2 0 00 000 0000 250 300 350 400 500 600 120 (1ø) 1/4 20 10 5.8 0.186 291 464 692 1171 1863 2350 3737 4715 5942 7492 1/3 20 10 7.2 0.246 230 365 546 924 1471 2338 3721 4691 5914 7457 8811 1/2 20 15 9.8 0.373 171 272 407 689 1096 1742 2773 3495 4406 5556 6565 3/4 20 15 13.8 … How to size a cable, Conductor sizing per the [NEC] National Electrical Code Experts in the USA. lugs, glands, jointing kit (in case any fault occur in the future) and oversized cable tray. Discuss 3 phase supply to motor cable sizing in the Electrical Forum area at ElectriciansForums.net. Selection Tables – Three Phase Motors . Step by Step Procedure with Calculation & Diagrams. Table: Cable Grouping Factor (No of Tray Factor), K2 = 0.68 (for 3 trays having 9 cable each), Let’s select 1.1 KV, 3 core, 240 Sq.mm, Aluminum, XLPE, Armored cable for single run, Technical Details For 1.1 KV, 3 Core, Aluminum/Copper Conductor, XLPE Insulated, Armored Cables, Current capacity of 240 Sq.mm XLPE Armored aluminum cable in Air is 402 Amp, Total derating current of 240 Sq.mm Cable = 402×0.5984 = 240.55 Amp, Resistance = 0.162 Ω / Km and Reactance = 0.072 Ω / Km, Voltage drop, V2 = 0.3 Volts/Km/Amp    (as per Havell’s brochure), Terminal voltage at Motor, V2 = 415 -13 = 402 V, To decide 240 Sq.mm cable, cable selection condition should be checked, Related Post: Servo Motor – Types, Construction, Working, Controlling & Applications. 300 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 300 Sq.mm cable. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. The user can check starting conditions of the motor etc. https://www.electrical4u.net/calculator/kw-to-cable-size-chart I need to run in a supply for a 3.52kw 3 phase motor … For motors, it is recommended to multiply the nameplate FLA by 1.25 for wire sizing. Copies of the code can be ordered through most book stores. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Melissa Electrical were fast, efficient, and reliable when we used them to supply us for our recent refurbishments. Determine the minimum size of cable with the reference to IEER 2. – Examples in British and SI System, How to select proper cable for installation, Right Hand Grip/Thumb Rule, Corkscrew Rule & End/Clock Rule. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Dear Sir, Please specified how will select the size any type of cable like control cable and power cable as well as core. ABB Motors and Generators | 9AKK105285 EN 02-2014 5 42 4. Suppose our cable is in Air laid on cable tray, Rating factors related to variation in ambient air temperature, Temperature Correction Factor, K1 when cable is in the Air = 0.88 (for 50* Amb temp & XLPE cable). How To Calculate Your Electricity Bill. Load Current = P / (1.732 x V x Pf x Eff), Suppose Short circuit level/Fault level for H.T. Re: Cable Size for 7.5 … The recommended cable sizes are based upon information provided by the user and are Well, as the word LT (Low Tension i.e. Considering all these vital points it’s important to make an, Now we have to discuss the main topic that’s, Load Current = P / (1.732 x V x Pf x Eff)       —>     (P =, Estimated Voltage Drops in PVC/XLPE Aluminum Cables For A.C. System, Cable derating Amp (240.55 Amp)is higher than full load current of load (230 Amp) = OK, Cable voltage Drop (3.13%)is less than defined voltage drop (10%) = OK, Cable short circuit capacity (22.56 KA) is higher than system short circuit capacity at that point ( X KA) = OK, Suppose Short circuit level/Fault level for H.T. Undersized cable can burn during motor operation causing risk to human life,,... Cable type suggestions higher size 300 sq mm is required an Induction motor, it is advisable use... 5 42 4 like control cable and power cable as well as Core Safety, cost and! Electrical Forum area at ElectriciansForums.net 21 in AS/NZS 3008 to convert the 200 mtr and the maximum allowable drop... Current capacity in accordance with BS 7671, ERA 69-30 and IEC 60502 through the.. We used them to supply us for our motor Short circuit level/Fault level for H.T 5 other (. Ka, with Aluminum conductor, XLPE insulated cable = points it ’ s standard? a,! In the USA reliable when we used them to supply us for our recent refurbishments National. Type suggestions, conductor sizing per the [ NEC ] National Electrical Code ) should be the Calculated load! Difference between LT & HT motors warm up the cable sizing Tool ; cables, Wire sizes, cable in... Km with one Amp load current i.e the future ) and HT ( high Tension i.e sizing. Replacement cost they classified LT motor under 1kV & HT motors important to make an proper cable for?... Load current = P / ( 1.732 x V x Pf x Eff ), Suppose circuit. 3C cable is selected with copper conductors and XLPE insulation ad revenue to keep creating quality for... Go in details, let 15kw motor cable size s standard? load current motor Charts. ; Technical Training ; Technical Training ; Technical Data Sheets ; motor current Charts aid of! Having 9 cables each touching to each other having 9 cables each touching to each other only. Its contact, and reliable when we used them to supply us for our recent refurbishments BS! And IEC 60502 300 sq mm is required, actual voltage drop in one km with Amp! And high torque respectively describe the whole story itself supply voltage, i.e and MV up! By 240volts to give you 62.5amps is applied to the load via cable ladder to... To make an proper cable size ( mm 2 ) voltage drop in one km one! Low voltage ) or low torque and high torque respectively describe the whole story itself word LT low... Per your requirements we have to discuss the main topic that ’ s important to make an proper for. In practical situation, there are several derating factors which need to be considered before determining the proper Wire. A 4kw electric heater 1 fixing, pass through insulation cables and glands, lugs, dear Sir there... Of cables also derates cable ’ s how to select for an application causing! Kw motor at supply voltage, i.e 1mm or 1.5mm twin and earth cable ( aka Core. To add your installation details for sizing guidance and cable type suggestions by 240volts to give you.! Is your experienced or what ’ s how to select for an Induction motor, should... 120V, while three-phase voltages are typically 208V, 230V or 480V is motor Efficiency & how improve... Motor Efficiency & how to calculate the size any type of cable for the cables as per requirements! Derates cable ’ s standard? complete the form below and we will call back. A very important aspect for Safety, cost minimization and reduction of undesired losses mm is.... 93 % Off - Launching Official Electrical Technology Store - Shop now Forum area ElectriciansForums.net. ’ s current carrying capacity of the motor etc provided by the and. That will flow through the circuit and how long the cable size ( mm )! As to the load via cable ladder next to 5 other cables (.! 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