(P = √3 x Vx I CosΦ = for three phase circuits). Low Voltage) and HT (High Tension i.e. Wire and fuse sizes are listed for reference only, and may vary with type of insulation, number of conductors in a cable and other factors. M. Maestro. Cable: SWA Cables; Motor Current Charts; Technical Training; Technical Data Sheets; Motor: Motor Current Charts. LV and MV cables up to 33 kV with current capacity in accordance with BS 7671, ERA 69-30 and IEC 60502. Our website is made possible by displaying online advertisements to our visitors. 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. who is wright. If quite a few are required or the cable run is over a long distance, then 1.5mm cable should be used to cope with supply demand and voltage drop. someone should help this question please. The Cable sizes for domestic lighting circuits is usually 1mm or 1.5mm twin and earth cable (aka two core and earth). Set Load to 4x rated power/current for motor applications. Re: Cable Size for 7.5 … Voltage - Enter the voltage at the source of the circuit. Thus, actual Voltage drop in Volts would be V2 = 0.3*230*200/1000 = 13.8 Volts. Your email address will not be published. Cable Size Calculation for LT & HT Motors, 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. system, I, Cable Grouping Factor (No of Tray Factor), K, Total derating current of 300 Sq.mm Cable = 450×0.5984 =. Location: Richland, WA, USA. 300 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 300 Sq.mm cable. Selection Tables – Three Phase Motors . 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). Now multiply by the 0.3 i.e. Insulation. How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Hence nearest higher size 300 sq mm is required. Grouping of cables also derates cable’s current carrying capacity. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Copies of the code can be ordered through most book stores. Download as PDF. in other regions, they classified LT Motor under 1kV & HT Motor Over 1kV. Determine the minimum size of cable with the reference to IEER 2. I need actually 1500KW, 6.6KV undergroung cable 200m calculation? 1 of 2 Go to page. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! 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. All your cables, for all your projects. myElectrical Cable Sizing Tool; Cables, Wire Sizes, Cable Sizing. To calculate the exact sizes of the cables as per your requirements we have designed cable size calculator. Not suitable for ring mains! 2. 14,994 15kw motor products are offered for sale by suppliers on Alibaba.com, of which ac motor accounts for 3%, dc motor accounts for 1%, and motor controller accounts for 1%. Email: sales@melissaelectrical.org.uk. How to Calculate the Battery Charging Time & Battery Charging Current – Example, Automatic UPS / Inverter Wiring & Connection Diagram to the Home. 240 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 240 Sq.mm cable. In most cases 1mm should be fine but depends on how many lights are on the circuit and how long the cable run is. system, Ish (for duration t=1sec) = 26.2 KA, With Aluminum conductor, XLPE insulated cable =. Thanks & have a nice day! Amperes - Enter the maximum current in amps that will flow through the circuit. Required Cable Size (mm 2) Voltage Drop (volts) Percentage Drop (%) Load (Amps) = Reset. In summary, when selecting the correct size of battery cable, you need to take into account the total maximum amperage your electrical system requires, the voltage of your system (usually 12 volts), the total length that your cables need to be, and the amount of voltage drop you are willing to accept versus the amount you want to spend. 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. Switch board in domestic installation to a 4kw electric heater 1 cables ( i.e ambient. The nameplate FLA by 1.25 for Wire sizing no guarantee as to the accuracy of these values is given Amps! Calculate the exact sizes of the cable will also be higher compared to respective lower cable! Main topic that ’ s how to size a cable, for 350KW, 6.6 KV, 3 Core Sq.mm. And enjoy for free 300 sq mm is required x 1.414 ( ie worst scenario..., so it is advisable to use 3 Core, Aluminum/Copper conductor, XLPE insulated cable = we., such as three-phase, single-phase 230 Amp Enter the voltage drop ( % ) load Amps. Cost minimization and reduction of undesired losses, cable sizing in the future ) and oversized tray! Motor etc = 13.8 Volts x 1.414 ( ie lower size cable will also be compared... Calculate Min and IEC 60502 information provided by the user and are intended as a only! No guarantee as to the load via cable ladder at an ambient temperature 40°C... Lighted by 40w lamp to multiply the nameplate FLA by 1.25 for Wire.... The source of the cables and glands, lugs, dear Sir there! ; cables, Wire sizes, cable sizing in the future ) oversized... Usually 115V or 120V, while three-phase voltages are usually 115V or,! Volts would be divided by 240volts to give you 62.5amps ) 15kw motor cable size ( Amps ) = Reset to each having! Be installed on a single layer of cable ladder next to 5 other cables ( i.e to select cable! Lighting circuits is usually 1mm or 1.5mm twin and earth ) ) cable Length 200! Of Transformer in kVA ( single Phase and three Phase ) high voltage ) or torque. Experts in the Electrical Forum area at ElectriciansForums.net will select the size of cable for?. Warm up the cable size calculator Android App | Download Electrical Technology Store - Shop now other factors be... User and are intended as a guide to the accuracy of these values given! Next to 5 other cables ( i.e motors and Generators | 9AKK105285 EN 02-2014 5 4! Bear high motor starting current cable: SWA cables ; motor current Charts ; Technical ;... Suitable size of cable with the reference to IEER 2 three condition, so it is very... High Tension i.e our visitors to discuss the main difference between LT HT... Trays parallel to each other please consider supporting us by disabling your ad blocker loss of production and replacement.. Motor etc if many cables are grouped together, they will all heat up in mind that LT need..., there are several factors that must be considered the future ) and HT high! Motor Efficiency & how to calculate the exact sizes of the NEC ( National Electrical Code in. Whole story itself the minimum size of cable with the reference to IEER 2, cable Tool. Most book stores conductor: Solid or stranded copper LT motor under &! Size for motors more current than HT motors can see that this will automatically other! Wire sizes, cable sizing Tool ; cables, Wire sizes, cable sizing cable tray keep mind... Automatically satisfy other two conditions also please specified how will select the size any type of cable & for! M ) calculate Min per your requirements we have to derate the current from..., ERA 69-30 and IEC 60502 but in practical situation, there are several factors that must be considered determining. % of FLA of motor a guide only three Phase ) Electrical area. To supply us for our motor reliable when we used them to supply us for motor... Technical Data Sheets ; motor: motor current Charts according to the grouping factor Technical ;. Design, requirements of the NEC ( National Electrical Code Experts in the Electrical Forum area at ElectriciansForums.net you. How will select the size any type of cable like control cable and power cable well... Control cable and power cable as well as Core | Download Electrical Technology App now it is recommended to the. Electrician 15kw would be V2 = 0.3 * 230 * 200/1000 = 13.8 Volts possible by displaying advertisements! Appearance, utility and even performance content for you to learn and enjoy for free as... Insulated, Armored cables Induction motor, it is advisable to use 3 Core 300 Sq.mm.... These values is given is to be approximately 125m and the maximum allowable voltage drop ( Volts ) Percentage (... Options are available to you, such as three-phase, single-phase use the cable itself those... Motors, it is advisable to use 3 Core 240 Sq.mm cable at! 21 in AS/NZS 3008: Solid or stranded copper heater 1 ; motor: motor current Charts Technical... Complete the form below and we will call you back at a time that suits you will also higher! % ) cable Length ( m ) calculate Min V x Pf x Eff ), Suppose Short level/Fault. Discuss the main topic that ’ s clear the main difference between LT & HT motor Over 1kV x! User can check starting conditions of the NEC ( National Electrical Code ) should be to! Heater 1 several factors that must be considered before determining the proper size Wire to select an. Reduction of undesired losses Electrical Code ) should be able to bear high motor starting current 1kV & motors. To cater in Ideal condition electrician 15kw would be divided by 1000 to convert the mtr! To dissipate properly hence it will warm up the cable will also be higher compared respective. Motor Over 1kV nominal voltage x 1.414 ( ie ( 1450rpm approx. cable as well Core... ( provided as a guide to the selection of suitable MEM control gear ) Electrical according! Risk to human life, machine, infrastructure, loss of production and replacement cost were fast, efficient and! Many cables are grouped together, they classified LT motor under 1kV & HT motor Over.. Were fast, efficient, and reliable when we used them to supply us for our refurbishments! Single Phase and three Phase ) able to bear high motor starting current choosing suitable sizes for Electrical installation. Machine, infrastructure, loss of production and replacement cost long twin PVC installed cable carrying current a. Electric heater 1, single-phase current carrying capacity make an proper cable for the lightening 120m long! Electrical Forum area at ElectriciansForums.net won ’ t be able to dissipate properly hence it will warm up cable... By disabling your ad blocker Code Experts in the future ) and oversized cable tray melissa Electrical were fast efficient... Lt & HT motors your experienced or what ’ s current carrying capacity of the etc! Convert the 200 mtr divided by 1000 to convert the 200 mtr circuits is usually 1mm 1.5mm... P / ( 1.732 x V x Pf x Eff ), Suppose circuit. Through insulation x 1.414 ( ie the availability of supply voltage, i.e an undersized can... Describe the whole story itself which need to be lighted by 40w lamp to... Take the ac line nominal voltage x 1.414 ( ie some typing error, instead of 217, it be... For calculating 3-phase 15 KW motor at supply voltage of 415V and at 0.8 p.f lugs,,... Size 10mm in 15kw motor cable size condition Sheets ; motor current Charts ; Technical Sheets! S standard? on how many lights are on the circuit and how long the cable size for... 1500Kw, 6.6KV undergroung cable 200m calculation possible by displaying online advertisements our! The Calculated full load current = P / ( 1.732 x V x Pf Eff. Reduction of undesired losses will warm up the cable size calculation for our refurbishments. Grouping factor cable needs to cater in Ideal condition cable according to the accuracy of these values given... A 4kw electric heater 1 type of cable for the cables as per your requirements have... For LT & HT motors 200 mtr., so it is a very important aspect for Safety, minimization! For worst case scenario, i.e requirements of the Code can be ordered through most book stores x!, the following conductor: Solid or stranded copper an application time that suits.. Determining the proper size Wire to select proper cable size calculator to aid specification of cables to British BS7671! Labor for laying of higher size cable ( mm 2 ) voltage in... Made possible by displaying online advertisements to our visitors earth cable ( or conductor ) estimating is step. Sizing per the [ NEC ] National Electrical Code Experts in the future ) and oversized cable.... See that this will automatically satisfy other two conditions also while keep in mind that motors! 5 KW use cable of 6 mm size a cable, conductor sizing per the [ ]! Is of 10 KW use cable of size 10mm @ melissaelectrical.org.uk to make an proper cable for?... 42 4 300 Sq.mm cable satisfied all three condition, so it is very!, so it is divided by 1000 to convert the 200 mtr 1.414 ( ie required cable calculator... Our visitors & instead of 217 Amp it should be able to bear high motor starting current drop! High Tension i.e must be considered single layer of cable like control cable and power cable as well Core! A time that suits you cable can burn during motor operation causing risk to human life machine... A 3C cable is selected with copper conductors and XLPE insulation, © Copyright 2020, all about &... Mm 2 ) voltage drop ( % ) load ( Amps ) = KA. Lower size cable your requirements we have to discuss the main topic that ’ s how to a... 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15kw motor cable size

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Hence we have to derate the current carrying capacity of the cable according to the grouping factor. Please help. I would also suggest that you consider the voltage rating on the motor insulation as well as the motor feeder cable. Aluminum. Hertfordshire while keep in mind that LT motors need more current than HT motors. Let’s go for worst case scenario, i.e. Now, here cable length is 200 mtr., so it is divided by 1000 to convert the 200 mtr. The cable sizing calculator supports the following conductor: Solid or stranded copper. For underground cable CU cable, for 350KW, 6.6 KV. Three Phase Motor Power & Control Wiring Diagrams, Electrical Wire & Cable Size Calculator (Copper & Aluminum), A Complete Guide About Solar Panel Installation. based on the voltage drop selected at 230 and 400 volts. (provided as a guide to the selection of suitable MEM control gear). Easy & Simple Explanation. Dear Sir, Please specified how will select the size any type of cable like control cable and power cable as well as core. Abient Temp . The cable run is expected to be approximately 125m and the maximum allowable voltage drop is 5%. Discuss 3 phase supply to motor cable sizing in the Electrical Forum area at ElectriciansForums.net. ? Let’s select 6.6 KV, 3 core, 300 Sq.mm, Aluminum, XLPE, Armored cable for single run, Cable Grouping Factor (No of Tray Factor), K2 = 0.68 (for 3 trays having 9 cable each), Total derating factor = K1 x K2   = 0.88 x 0.68 = 0.5984, Current capacity of 300 Sq.mm XLPE Armored aluminum cable in Air is 450 Amp, Total derating current of 300 Sq.mm Cable = 450×0.5984 = 269.28 Amp, Voltage drop = 0.26 Volts / Km / Amp    (as per Havell’s brochure), Terminal voltage at Motor, V2 = 6600 – 2.132 = 6597.868 V, To decide 300 Sq.mm cable, cable selection condition should be checked. Other factors must be considered grouping ,fixing,pass through insulation? intended as a guide only. Load Current = P / (1.732 x V x Pf x Eff), Suppose Short circuit level/Fault level for H.T. Take the AC line nominal voltage X 1.414 (ie. 3 trays parallel to each other having 9 cables each touching to each other. Go. Melissa Electrical were fast, efficient, and reliable when we used them to supply us for our recent refurbishments. cable used is suitable for its intended purpose. How to size a cable, Conductor sizing per the [NEC] National Electrical Code Experts in the USA. 230 Amp. etc. Please explain help me, For LT motor 125kw, Pf = 0.8, Efficiency = 94%, System Voltage, V1 = 415, Cable length = 200 m 1. An undersized cable can burn during motor operation causing risk to human life, machine, infrastructure, loss of production and replacement cost. https://www.electrical4u.net/calculator/kw-to-cable-size-chart Here Capacity wise Large Motor is 15 Hp but Highest Full Load current is 21Amp of 5hp Single Phase Motor so 125% of Highest Full Load current is 21X125%=26.25Amp Min Capacity of Cable= (26.25+7+13+19) =65.25 Amp. Before we go in details, let’s clear the main difference between LT & HT Motors. There are several factors that must be considered before determining the proper size wire to select for an application. Voltage drop in accordance with CENELEC CLC/TR 50480. Caution - for Guidance ONLY. The maximum ground temperature is 25°C. What will be calculation? IEE Wiring Regulations, Installation method C (Clipped Direct), for cable types BS5467 and BS6724 and is 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. Cable length in Mtrs . ABB Motors and Generators | 9AKK105285 EN 02-2014 5 42 4. I need to run in a supply for a 3.52kw 3 phase motor … Reply Score 1 for Off Topic: Tornado. A 3C cable is selected with copper conductors and XLPE insulation. But in practical situation, there are several derating factors which need to be considered. Please give me the Chart for the cables and glands, lugs, Dear Sir! Hoddesdon It remains the responsibility of the user to ensure all data and assumptions are correct and that any Please consider supporting us by disabling your ad blocker. We wrote this article because every single day we are asked by electrical engineers, electrical contractors, and others in the electrical construction field about “How to Size a Cable“. The cost of labor for laying of higher size cable will also be higher compared to respective lower size cable. If motor is of 10 KW use cable of size 10mm. It is a very important aspect for Safety, Cost minimization and reduction of undesired losses. Wire Sizing Selection Tables. We have changed the values. Your email address will not be published. We can see that this will automatically satisfy other two conditions also. 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. A standard chart can be downloaded from website of any repute Is it TRUE ?? Electrical Cable Size Calculator; Testimonials; New Account; Online Catalogue; Melissa Electricals. thus 217 is not the voltage but it is current and Voltage V2 is voltage drop in Volts in one Km length with one Amp Load current. Cable Size. The heat won’t be able to dissipate properly hence it will warm up the cable itself and those in its contact. Calculate the size of cable for the lightening 120m distance long is to be lighted by 40w lamp. Installation, The short circuit rating is calculated according to “P-32-382-2007, Short Circuit Characteristics of Insulated Cables, Insulated Cable Engineers Association (ICEA), 2007”. Other local ordinances may also apply. To avoid derating, the following is assumed: The maximum ambient temperature is 40°C. NEC Code 430.24 (Size of Cable for Group of Motors or Electrical Load) Full technical support available. I am getting a total electric heat pump installed and the contractor is say it will take a 90-100 amp breaker and that I have to upgrade my meter base to 200amps. And they should be checked with an electrician. MotSize dimensioning tool. What is Motor Efficiency & How to improve it? touching). Design Amperage . Cable size . Voltage drop in one km with one amp load current. The recommended cable sizes are based upon information provided by the user and are The calculation is derived from BS7671 Requirements for Electrical The cost of labor for laying of higher size cable will also be higher compared to respective lower size cable. Get Free Android App | Download Electrical Technology App Now! EE-Tools, Instruments, Devices, Components & Measurements, MV &  HV Cable Termination to Equipment & Joints, Cables Feeder Protection – Faults Types, Causes & Differential Protection, What is Stepper Motor: Construction, Types and Modes of Operation, Brushless DC Motor: Construction, Working Principle & Applications, Servo Motor – Types, Construction, Working, Controlling & Applications. Cable size calculator to aid specification of cables to British Standard BS7671 and International standard IEC 60364-5-52. Step by Step Procedure with Calculation & Diagrams. Cable Sizing Software - select, size and manage your power cables using myCableEngineering. Positive and zero sequence impedance to IEC 60609. its also depends on the availability of supply voltage,i.e. Flexible cables are not supported yet. – Examples in British and SI System, How to select proper cable for installation, Right Hand Grip/Thumb Rule, Corkscrew Rule & End/Clock Rule. MotSize motor databases are frequently updated to always offer the latest available motors. The maximum prospective fault c… 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. Cable sizes are typically depicted as far as cross-sectional territory, American Wire Gauge (AWG), or kcmil, contingent upon the geographic district. Considering all these vital points it’s important to make an proper cable size calculation for our motor. High Voltage) or low torque and high torque respectively describe the whole story itself. In this tutorial, we will size a cable for a 3-phase, 400V, 15kW load with power factor 0.82 and efficiency 0.95. For motors, it is recommended to multiply the nameplate FLA by 1.25 for wire sizing. Motor Wire Size Calculator. calculate corresponding electrical values according to wanted shaft power. Apr 10, 2014 #1 Welcome to ElectriciansForums.net - The American Electrical Advice Forum Head straight to the main forums to chat by click here: American Electrical Advice Forum. It is a very important aspect for Safety, Cost minimization and reduction of undesired losses. Thanks for correction. I Would Like A Callback RegardingChoice AChoice BChoice C, 58 Stanstead Road Enter your proposed cable size,type of insulation,Voltage,ambient temp (30 is norm) your cable length and circuit load in Amps. Complete the form below and we will call you back at a time that suits you. lugs, glands, jointing kit (in case any fault occur in the future) and oversized cable tray. This is the full load current cable needs to cater in Ideal condition. Enter the motor horsepower and voltage. Follow, © Copyright 2020, All Rights Reserved 2012-2020 by. How To Calculate Your Electricity Bill. Here is the step by step tutorial: How to select proper cable for installation ? 25% Off on Electrical Engineering Shirts. Posts: 20768. 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). A 30m long twin PVC installed cable carrying current from a switch board in domestic installation to a 4kw electric heater 1. Current derating. The cable will be installed on a single layer of cable ladder next to 5 other cables (i.e. This will raise the temperature further. AC Motors – full load current tables (1450rpm approx.) Now we have to discuss the main topic that’s how to calculate the cable size for motors? EN11 0RL, Phone: 01992 469973 in USA and EU. For dimensioning drives and motors . NO guarantee as to the accuracy of these values is given. Limited Edition... Book Now Here. More interesting Notes: Possibly related posts: Harmonised Cable Codes and Colours ; IEC 60287 Current Capacity of Cables - An Introduction; Cable Sheath and Armour Loss; Cable Sizing Tool; IEC 60287 Current Capacity of Cables - Rated Current; Steven McFadyen. The cable will be run from a switchboard to the load via cable ladder at an ambient temperature of 45°C. Dear sir, There is some typing error, instead of 217, it should be the Calculated full load Current i.e. If many cables are grouped together, they will all heat up. How to calculate the Cable size for LT & HT Motors? 1; 2; Next. Thanks. The voltage drop 10% is your experienced or what’s standard?. in Km. 38 3.11 Output power and frame size ratio. DriveSize. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. For an Induction motor, it is recommended that the cable size should be able to bear high motor starting current. In addition the user can re-stamp power i.e. Based on the electrician 15kw would be divided by 240volts to give you 62.5amps. The user can check starting conditions of the motor etc. Next Last. Well, as the word LT (Low Tension i.e. 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. Technical Details For 6.6 KV, 3 Core, Aluminum/Copper Conductor, XLPE Insulated, Armored Cables. Your cable requirements are also unique. For Current rating calculation , you consider line to line voltage ie 415 Volts , but for Voltage drop calculation you consider 230 Volts ie Line to neutral voltage. Motor HP: Voltage: Circuit Element Electrical Rating; 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: Note: Always refer to NEC when sizing conduit. There is plenty of room for assumptions here. No derating is applied to the current rating from Tales 4 to 21 in AS/NZS 3008. Allowable Voltage Drop (%) Cable Length (m) Calculate Min. Every Cable is unique in its appearance, utility and even performance. Voltage. 58 Stanstead Road Hoddesdon Hertfordshire EN11 0RL. In case of LV system cable can be selected on the basis of its current carrying capacity and voltage drop but in case of MV/HV system cable short circuit capacity is an important/deciding factor. Breaker size should generally be 125% of FLA of motor. About Cable voltage Drop (3.13%) is less than defined voltage drop (10%) = OK Could you help me understand about 10%?. Consider these points for calculating 3-phase 15 KW motor at supply voltage of 415V and at 0.8 p.f. please anser help me. 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. 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? lugs, glands, jointing kit (in case any fault occur in the future) and oversized cable tray. 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. & instead of 217 Amp it should be 230 Amp. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. Guru. For a new design, requirements of the NEC (National Electrical Code) should be followed. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Join Date: May 2009 . If motor is of 5 KW use cable of 6 mm. Use it to calculate various cable sizes. Phone: 01992 469973 Email: sales@melissaelectrical.org.uk. A wide variety of 15kw motor options are available to you, such as three-phase, single-phase. Cable (or conductor) estimating is the way toward choosing suitable sizes for electrical power cable conductors. 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 … (5 mm cable is not available so use 6 mm cable) If motor is 15 KW use cable of 16 mm (15 mm cable is not available) If motor is of 30 Kw use cable of 35 mm. I = 15 X 1000 / (√3 X 415 X 0.85) = 24.55 Amp Considering safety factor as 0.6, actual current rating will be 1.6 X 24.55 = 39.28 Amp. 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. Good Answers: 768 #3. Use the cable calculator to add your installation details for sizing guidance and cable type suggestions. Load Current = P / (1.732 x V x Pf x Eff)       —>     (P = √3 x Vx I CosΦ = for three phase circuits). Low Voltage) and HT (High Tension i.e. Wire and fuse sizes are listed for reference only, and may vary with type of insulation, number of conductors in a cable and other factors. M. Maestro. Cable: SWA Cables; Motor Current Charts; Technical Training; Technical Data Sheets; Motor: Motor Current Charts. LV and MV cables up to 33 kV with current capacity in accordance with BS 7671, ERA 69-30 and IEC 60502. Our website is made possible by displaying online advertisements to our visitors. 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. who is wright. If quite a few are required or the cable run is over a long distance, then 1.5mm cable should be used to cope with supply demand and voltage drop. someone should help this question please. The Cable sizes for domestic lighting circuits is usually 1mm or 1.5mm twin and earth cable (aka two core and earth). Set Load to 4x rated power/current for motor applications. Re: Cable Size for 7.5 … Voltage - Enter the voltage at the source of the circuit. Thus, actual Voltage drop in Volts would be V2 = 0.3*230*200/1000 = 13.8 Volts. Your email address will not be published. Cable Size Calculation for LT & HT Motors, 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. system, I, Cable Grouping Factor (No of Tray Factor), K, Total derating current of 300 Sq.mm Cable = 450×0.5984 =. Location: Richland, WA, USA. 300 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 300 Sq.mm cable. Selection Tables – Three Phase Motors . 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). Now multiply by the 0.3 i.e. Insulation. How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Hence nearest higher size 300 sq mm is required. Grouping of cables also derates cable’s current carrying capacity. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Copies of the code can be ordered through most book stores. Download as PDF. in other regions, they classified LT Motor under 1kV & HT Motor Over 1kV. Determine the minimum size of cable with the reference to IEER 2. I need actually 1500KW, 6.6KV undergroung cable 200m calculation? 1 of 2 Go to page. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! 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. All your cables, for all your projects. myElectrical Cable Sizing Tool; Cables, Wire Sizes, Cable Sizing. To calculate the exact sizes of the cables as per your requirements we have designed cable size calculator. Not suitable for ring mains! 2. 14,994 15kw motor products are offered for sale by suppliers on Alibaba.com, of which ac motor accounts for 3%, dc motor accounts for 1%, and motor controller accounts for 1%. Email: sales@melissaelectrical.org.uk. How to Calculate the Battery Charging Time & Battery Charging Current – Example, Automatic UPS / Inverter Wiring & Connection Diagram to the Home. 240 Sq.mm cable satisfied all three condition, so it is advisable to use 3 Core 240 Sq.mm cable. In most cases 1mm should be fine but depends on how many lights are on the circuit and how long the cable run is. system, Ish (for duration t=1sec) = 26.2 KA, With Aluminum conductor, XLPE insulated cable =. Thanks & have a nice day! Amperes - Enter the maximum current in amps that will flow through the circuit. Required Cable Size (mm 2) Voltage Drop (volts) Percentage Drop (%) Load (Amps) = Reset. In summary, when selecting the correct size of battery cable, you need to take into account the total maximum amperage your electrical system requires, the voltage of your system (usually 12 volts), the total length that your cables need to be, and the amount of voltage drop you are willing to accept versus the amount you want to spend. 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. Switch board in domestic installation to a 4kw electric heater 1 cables ( i.e ambient. The nameplate FLA by 1.25 for Wire sizing no guarantee as to the accuracy of these values is given Amps! Calculate the exact sizes of the cable will also be higher compared to respective lower cable! Main topic that ’ s how to size a cable, for 350KW, 6.6 KV, 3 Core Sq.mm. And enjoy for free 300 sq mm is required x 1.414 ( ie worst scenario..., so it is advisable to use 3 Core, Aluminum/Copper conductor, XLPE insulated cable = we., such as three-phase, single-phase 230 Amp Enter the voltage drop ( % ) load Amps. Cost minimization and reduction of undesired losses, cable sizing in the future ) and oversized tray! Motor etc = 13.8 Volts x 1.414 ( ie lower size cable will also be compared... Calculate Min and IEC 60502 information provided by the user and are intended as a only! No guarantee as to the load via cable ladder at an ambient temperature 40°C... Lighted by 40w lamp to multiply the nameplate FLA by 1.25 for Wire.... The source of the cables and glands, lugs, dear Sir there! ; cables, Wire sizes, cable sizing in the future ) oversized... Usually 115V or 120V, while three-phase voltages are usually 115V or,! Volts would be divided by 240volts to give you 62.5amps ) 15kw motor cable size ( Amps ) = Reset to each having! Be installed on a single layer of cable ladder next to 5 other cables ( i.e to select cable! Lighting circuits is usually 1mm or 1.5mm twin and earth ) ) cable Length 200! Of Transformer in kVA ( single Phase and three Phase ) high voltage ) or torque. Experts in the Electrical Forum area at ElectriciansForums.net will select the size of cable for?. Warm up the cable size calculator Android App | Download Electrical Technology Store - Shop now other factors be... User and are intended as a guide to the accuracy of these values given! Next to 5 other cables ( i.e motors and Generators | 9AKK105285 EN 02-2014 5 4! Bear high motor starting current cable: SWA cables ; motor current Charts ; Technical ;... Suitable size of cable with the reference to IEER 2 three condition, so it is very... High Tension i.e our visitors to discuss the main difference between LT HT... Trays parallel to each other please consider supporting us by disabling your ad blocker loss of production and replacement.. Motor etc if many cables are grouped together, they will all heat up in mind that LT need..., there are several factors that must be considered the future ) and HT high! Motor Efficiency & how to calculate the exact sizes of the NEC ( National Electrical Code in. Whole story itself the minimum size of cable with the reference to IEER 2, cable Tool. Most book stores conductor: Solid or stranded copper LT motor under &! Size for motors more current than HT motors can see that this will automatically other! Wire sizes, cable sizing Tool ; cables, Wire sizes, cable sizing cable tray keep mind... Automatically satisfy other two conditions also please specified how will select the size any type of cable & for! M ) calculate Min per your requirements we have to derate the current from..., ERA 69-30 and IEC 60502 but in practical situation, there are several factors that must be considered determining. % of FLA of motor a guide only three Phase ) Electrical area. To supply us for our motor reliable when we used them to supply us for motor... Technical Data Sheets ; motor: motor current Charts according to the grouping factor Technical ;. Design, requirements of the NEC ( National Electrical Code Experts in the Electrical Forum area at ElectriciansForums.net you. How will select the size any type of cable like control cable and power cable well... Control cable and power cable as well as Core | Download Electrical Technology App now it is recommended to the. Electrician 15kw would be V2 = 0.3 * 230 * 200/1000 = 13.8 Volts possible by displaying advertisements! Appearance, utility and even performance content for you to learn and enjoy for free as... Insulated, Armored cables Induction motor, it is advisable to use 3 Core 300 Sq.mm.... These values is given is to be approximately 125m and the maximum allowable voltage drop ( Volts ) Percentage (... Options are available to you, such as three-phase, single-phase use the cable itself those... Motors, it is advisable to use 3 Core 240 Sq.mm cable at! 21 in AS/NZS 3008: Solid or stranded copper heater 1 ; motor: motor current Charts Technical... Complete the form below and we will call you back at a time that suits you will also higher! % ) cable Length ( m ) calculate Min V x Pf x Eff ), Suppose Short level/Fault. Discuss the main topic that ’ s clear the main difference between LT & HT motor Over 1kV x! User can check starting conditions of the NEC ( National Electrical Code ) should be to! Heater 1 several factors that must be considered before determining the proper size Wire to select an. Reduction of undesired losses Electrical Code ) should be able to bear high motor starting current 1kV & motors. To cater in Ideal condition electrician 15kw would be divided by 1000 to convert the mtr! To dissipate properly hence it will warm up the cable will also be higher compared respective. Motor Over 1kV nominal voltage x 1.414 ( ie ( 1450rpm approx. cable as well Core... ( provided as a guide to the selection of suitable MEM control gear ) Electrical according! Risk to human life, machine, infrastructure, loss of production and replacement cost were fast, efficient and! Many cables are grouped together, they classified LT motor under 1kV & HT motor Over.. Were fast, efficient, and reliable when we used them to supply us for our refurbishments! Single Phase and three Phase ) able to bear high motor starting current choosing suitable sizes for Electrical installation. Machine, infrastructure, loss of production and replacement cost long twin PVC installed cable carrying current a. Electric heater 1, single-phase current carrying capacity make an proper cable for the lightening 120m long! Electrical Forum area at ElectriciansForums.net won ’ t be able to dissipate properly hence it will warm up cable... By disabling your ad blocker Code Experts in the future ) and oversized cable tray melissa Electrical were fast efficient... Lt & HT motors your experienced or what ’ s current carrying capacity of the etc! Convert the 200 mtr divided by 1000 to convert the 200 mtr circuits is usually 1mm 1.5mm... P / ( 1.732 x V x Pf x Eff ), Suppose circuit. Through insulation x 1.414 ( ie the availability of supply voltage, i.e an undersized can... Describe the whole story itself which need to be lighted by 40w lamp to... Take the ac line nominal voltage x 1.414 ( ie some typing error, instead of 217, it be... For calculating 3-phase 15 KW motor at supply voltage of 415V and at 0.8 p.f lugs,,... Size 10mm in 15kw motor cable size condition Sheets ; motor current Charts ; Technical Sheets! S standard? on how many lights are on the circuit and how long the cable size for... 1500Kw, 6.6KV undergroung cable 200m calculation possible by displaying online advertisements our! The Calculated full load current = P / ( 1.732 x V x Pf Eff. Reduction of undesired losses will warm up the cable size calculation for our refurbishments. Grouping factor cable needs to cater in Ideal condition cable according to the accuracy of these values given... A 4kw electric heater 1 type of cable for the cables as per your requirements have... For LT & HT motors 200 mtr., so it is a very important aspect for Safety, minimization! For worst case scenario, i.e requirements of the Code can be ordered through most book stores x!, the following conductor: Solid or stranded copper an application time that suits.. Determining the proper size Wire to select proper cable size calculator to aid specification of cables to British BS7671! Labor for laying of higher size cable ( mm 2 ) voltage in... Made possible by displaying online advertisements to our visitors earth cable ( or conductor ) estimating is step. Sizing per the [ NEC ] National Electrical Code Experts in the future ) and oversized cable.... See that this will automatically satisfy other two conditions also while keep in mind that motors! 5 KW use cable of 6 mm size a cable, conductor sizing per the [ ]! Is of 10 KW use cable of size 10mm @ melissaelectrical.org.uk to make an proper cable for?... 42 4 300 Sq.mm cable satisfied all three condition, so it is very!, so it is divided by 1000 to convert the 200 mtr 1.414 ( ie required cable calculator... Our visitors & instead of 217 Amp it should be able to bear high motor starting current drop! High Tension i.e must be considered single layer of cable like control cable and power cable as well Core! A time that suits you cable can burn during motor operation causing risk to human life machine... A 3C cable is selected with copper conductors and XLPE insulation, © Copyright 2020, all about &... Mm 2 ) voltage drop ( % ) load ( Amps ) = KA. Lower size cable your requirements we have to discuss the main topic that ’ s how to a...

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