Method for Installation of Cable & Wire (Part-1), How to Design Efficient Street Lighting-Part-4, How to Design Efficient Street Lighting-Part-3, How to Design Efficient Street Lighting-Part-2, How to Design Efficient Street Lighting-Part-1, Quick Reference Lighting Power Densities, Calculation of Crippling (Ultimate Transverse) Load on Electrical Pole, Various Factors for Illumination Calculations, Calculate Transformer Regulation & Losses (As per Transformer Name Plate), Type of Lighting Bulbs (Shapes and Sizes) Part-5, Type of Lighting Bulbs (Shapes and Sizes) Part-4, Type of Lighting Bulbs (Shapes and Sizes) Part-3, Type of Lighting Bulbs (Shapes and Sizes) Part-2, Type of Lighting Bulbs (Shapes and Sizes) Part-1, Methods of Earth Resistance Testing (Part-3), Methods of Earth Resistance Testing (Part-2), Methods of Earth Resistance Testing (Part-1), Method for Installation of Earthing Strip, Calculate Size of Anchor Fastener for Water Pipe Support. The efficiency of the motor and the machine it drives we must again assume are adequate for the end result. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. This value is the same for a star or delta connected motor, since the delta connection of the motor does not influence the cable resistance. MM Al 1.5 Sq. 4 AMP. Star/Delta Wiring Calculator Simple enter the measured current in Amps, and voltage in Volts for one coil in the alternator, together with the number of coils per phase and the number of phases.Click Calculate and our calculator will automatically work out the total output voltage and current for both Star and Delta configurations for the complete alternator. Thermal over Load Relay setting =58%x13= 8 Amp. This is the current to use for cable sizing of the six conductors. Forget the starting current when choosing the overload settings in the starter. Overload Relay Range . As the starting current is very high and if we select the cable on full load amps so can it bear the high inrush current? Kindly let me know. Full Load Current. 12 Comments. The setting must be x0.58 FLC (line current). This transformer calculator helps you to quickly and easily calculate the primary and secondary full-load currents of the transformer. Joined Jun 25, 2006 1. May 5th, 2007, 03:00 AM. AMP. How to size a cable, Conductor sizing per the [NEC] National Electrical Code Experts in the USA. Cable Selection Chart for Submersible Pumps, Manufacturer of Submersible Pumps, Borehole Pumps, Pond Pumps, Water Pumps, Centrifugal Pump, V3 Submersible Pumps, V4 Submersible Pumps, Sewage Pumps, Turbine Pumps, Submersible Pumps, V6 Submersible Pumps, V8 Submersible Pumps, in Gujarat, India. Well you do not have 2 cables being run in parallel, you have one cable to each end of each winding. Every Cable is unique in its appearance, utility and even performance. If Motor Capacity is less than 30 KW than Motor Starting Torque is 3xMotor Full Load Current or 2X Motor Full Load Current. Max. I suggest that it is acceptable to use this figure as the current in each line going to the star/delta starter. AMP. For both DOL and Star-Delta Starter input fields are: System Voltage (V) Phase (1ph/3ph) Type of Motor (single phase, 3-phase induction, synchronous, wound rotor etc.) Motor Output. RECOMMENDED CABLE SIZES FOR MOTORS; CURRENT RATING OF WIRES & CABLES; Motor Output Clear. Over Load Relay Range 1.5 - 3 AMP. This site uses Akismet to reduce spam. IET Services Limited is registered in England Registered Office Savoy Place, London, WC2R 0BL Registration Number 909719, IET Services Limited is trading as a subsidiary of the Institution of Engineering and Technology, which is registered as a Charity in England & Wales (no 211014) and Scotland (no SC038698). On Sat, 1 Sep 2018, 00:14 Electrical Notes & Articles, wrote: > Jignesh.Parmar posted: ” Calculate Size of each Part of Star-Delta starter > for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type > Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. If pirate bill looks at the data plate on the motor in question there is usually a figure for nominal full load current. Hence the cable rating formula can be written as, Cable size = 1.5 x Full Load Current. Kidblue. AMP. The Main and Delta contactors are smaller compared to single contactor used in a Direct on Line starter because they Main and Delta contactors in star delta starter are controlling winding currents only. AMP. Learn how your comment data is processed. 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“. Max. A star delta is used for a cage motor designed to run normally on the delta connected stator winding. Basic Calculation of Motor Torque… For the delta connection the currents are I (phase) so. Kabel Assist Calculator. Size of Main Contactor (Starting-Transition-Running) = 58%X Full Load Current (Line). I (phase) = I (line) / root (3) = 26.7 / 1.732 = 15.42A. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Backup fuse . On Sat, Sep 1, 2018 at 12:44 AM Electrical Notes & Articles wrote: How to calculate the size of power contactor /fuse/over load relay/power cable size for DOL Starter. straw. Cable size calculation formula: The cable size is equal to the 1.5 times of the full load current of the motor/load. The overload then always measures the current inside the windings, and is thus always correct. August 31, 2018 Size of Delta Contactor (Running Condition) = 58%X Full Load Current (Line). You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52]. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. A good field reference for maintenance and troubleshooting is Ugly's Electric Motor and Controls (Ugly's Electric Motors And Controls, 2014 Edition).This calculator is based on information found in this reference guide, and can help electricians troubleshoot maintenance and control circuits. Jun 25, 2006 #1 i am a student. Use it to calculate various cable sizes. Normally fit one overload (usually on the LINE or MAIN contactor) and normally rate at 0.58 of the FLC. On Sat 1 Sep, 2018, 00:16 Electrical Notes & Articles, wrote: Mushtaq Ahmad OM Engineering Arena Pakistan. 415 V 3Ph 50Hz. calculation delta and star motor power? Motor Starting Current (Line)=3×13=39 Amp. Please post about cost ratio of overhead line and underground cable. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. ->Disadvantage: O/L Relay will not give Protection while Motor runs in Delta (Relay Setting is too High for Delta Winding). Calculate Size of each Part of Star-Delta starter for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. These are AC3 rated at 58% of the current rating of the motor. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. ( Log Out / If You find this content in any other site,it makes the page you are viewing an infringement of the copyright. you can not reproduce,republish or communicate any of the content , including files downloadable from this website, without the permission of the copyright owner.The use of this content on any other websites breaches copyright Act. Size of Star Contactor (Starting Condition) = 33%X Full Load Current (Line). As per above chart Minimum Locked Rotor Current =1000x10x1/1.732×415=14 Amp. But dont forget, as someone as already said the correction factors. Enter your email address to follow this blog and receive notifications of new posts by email. It also determines the turns ratio and type of transformer Change ). The currents in the six conductors will be I (line) for the star connection, so 8.9A. Thanks everyone for the help. Motor KW = 125. Just to avoid confusion there is a Jaymac and a Jaymack involved in this discussion!! As I said above I had the books in front of me any still could not see an easy answer! Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). The overload size is based upon the normal delta full load running current. Cable size is calculated in a motor by its current rating. Hi .This video shows how to calculate cable and circuit breaker (fuse)for the design current. please share short circuit calculation ( base KVA method) in excel format. Size Supply Side . Backup Fuse (max.) Sq. Thermal over Load Relay setting =100%x13= 13 Amp, Disadvantage: O/L Relay will not give Protection while Motor runs in Delta (Relay Setting is too High for Delta Winding). Change ), You are commenting using your Facebook account. Also > Calculate Size of Overload Relay if O/L Relay Put in the” >. Star contactor can be selected smaller than the others, providing the star contactor pulls first before the main contactor. The current in each of the six cables from the star/delta starter to the motor will be 58% of the line current. I think you would need two overload relays, one for Delta contactor, and one for the Star contactor It's not the way i've always done it. Maximum Size of Non Time Delay Fuse=1.75%13=23 Amp. Size of Main Contactor =58%x13 = 8 Amp. Second motor is 5hp,3phase,50hz,3000rpm. Recommended Cable Size 2.5 Sq. And relation between them what is the ratio of between them?? Sorry, your blog cannot share posts by email. ( Log Out / About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). Line 1 AMP. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. Minimum Earth Cable Sizing Calculation Calculator The minimum cross-sectional area determined by calculation shall be not less than the value determined by the following equation (applicable only for disconnection times not less than 0.1 s but not exceeding 5 s). Your cable requirements are also unique. Size each one according to your calculations and the local codes & laws. that should be 35,60,100% for star delta and main the main contactor makes in star but breaks FLA can't recall if they're sized that way in practice-i assume so the overload in series with the motor windings gives the closest protection folowed by supply lines and delta so each cable carries the same current as each winding. FuseTalk Standard Edition v3.2 - © 1999-2020 FuseTalk Inc. All rights reserved. Bigger size cable is always better but cost much more. This is a big advantage of a star delta starter, as it typically has around 1/3 of the inrush current compared to a DOL starter. For detail about star delta stater please read my last […] Anyway a common way of calculating the cable size is to realize the current in the cables between starter and motor when running is 0.58 times the supply current. Direct Online Starter. System Voltage, V1 = 415. Hi, were upgrading a motor at work from 11kw to 18.5kw. The phase current for a 30KW motor on 380V is about 46 Amps at full load. He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. Dewalt Electric Motor Proffesional Reference book, Other and general engineering discussions, Principal Engineering Manager - Site Engineering Authority, Associate Systems Engineer - Combat Systems. Wired in star/delta, that's split over two wires per phase so 23A. Min Thermal Over Load Relay setting =70%x7= 5 Amp, Max Thermal Over Load Relay setting =120%x7= 9 Amp. Top: Bottom. Thickness of the cable is directly proportional to the ampere rating.. Just divide the kW by rated supply voltage you can determine the operating current by seeing that we can determine the thickness of the wire.. [Image source : Google image ] … ( Log Out / Motor Size (HP or kW) Motor Code (A, B, C… -H) Motor Efficiency (%) Motor RPM; System P.F There are two contactors that are close during run, often referred to as the main contractor and the delta contactor. The calculations in this thread reminded me that i did all this in theory class during the City And Guilds 2330. You only need to choose one size of supply cable to the motor starter. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. Also Calculate Size of Overload Relay if O/L Relay Put, (overload is placed after the Winding Split into main and delta Contactor) or. please can you explain why? Describes cable resistance between inverter and motor for one phase (see Parameterlist). fuseless what will be the standard for contractor sizing, will it follow the same thumb rule of 58% and 33%? Please càn you enlight me on those figures, 9500,5252 ànd 13 where you got them from!thanks, How to calculate the amps of a motor if in star and delta. Why don’t you join some of the world’s finest scientific and technical minds and help us make tomorrow work today? I work on the basis that the line current is the figure to use for cable sizing. Direct Online Starter. For motors rated 40EC with a Service Factor of 1.15 or greater, 125% of the motors FLA is used to calculate the maximum size device for overload protection. Electric Calculator. Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor. Backup … Thread starter straw; Start date Jun 25, 2006; Search Forums; New Posts; S. Thread Starter. Change ), You are commenting using your Twitter account. ( Log Out / For star delta stater,the motor connection must have 6 cables from control panel and 6 terminals at induction motor ( U1,U2,V1,V2,W1,W3).To wiring the motor connection for star delta starter,the important thing that we must fully understand is about the basic of STAR DELTA MAGIC TRIANGLE. Recommended Cable . Star Delta Starter The Star Delta Starter is a very common type of starter and is used extensively as compared to the other type of starting methods of the induction motor. The start up current is short lived and the cable will have little time to get hot. For a star-delta starter we have the possibility to place the overload protection in two positions, in the line or in the windings. Motor wire size and circuit protection calculator. Motor Full Load Current (Phase) ==13/1.732=7 Amp. Cable Size Calculation of 125 Kw LT Motor. For motors rated greater than 40 EC or unmarked, 115% of the motors FLA is used to calculate the maximum size device regardless of the motor’s Service Factor. Thanks for some basics Geoff, but the original question was about the current in each of the 6 conductors between the star delta starter and the motor which is the line current in star but not in delta. Sq. Correct me if I am wrong. Motor Starters A Paper on traditional Electromechanical starters including Direct On Line, Primary resistance, Autotransformer and star delta (wye delta) for induction motors illustrating how to use them and what characteristics can be expected. Sq.mm Al . When the starter switches over to Delta, the motor draws full power, but since the contactors and the overload relay are usually wired within the Delta, you need to use contcators and relay which are only rated 1/√3 =58% of the full rated power of the motor. I tend to look at an 18.5 kw motor as drawing approx 37 amps /phase. He is FIE ,MIE and CEng from Institution of Engineers,India. I will revise my figure from 30 to 26 amps for the line current with the current splitting between two windings and 0.577 of it flowing through each being 15 amps. Motor Rated Torque (Full Load Torque)=5252x10x600=88 lb-ft. Motor Rated Torque (Full Load Torque)=9500x(10×0.746)x600 =119 Nm. The calculation of current does not depend on the rpm you just need hp and voltage. Star Delta Starter. You have 400A rather than 400V in your equation. What is the current for both motors. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). Full Load Current. To calculate the exact sizes of the cables as per your requirements we have designed cable size calculator. My first post was simply presenting the basic principles for the three phase circuit - which is all I intended to do. This is the full load current cable needs to cater in Ideal condition. A star delta starter is a type of reduced voltage starter.We use it to reduce the starting current of the motor without using any external device or apparatus. He is member of Institution of Engineers (MIE) and CEng,India. Size … Recommended Cable Sizes For Motors Current Rating Of Wires & Cables House & Building Wires. i have a question about three phase power. Pf = 0.8, Efficiency = 94%. I would like to know about the selection of cable for motors. The content in electricalnotes.wordpress.com is for personal, non-commercial use only. 1) how much power does the load … Membership No:F-1264873 ,M-1473586.He has more than 19 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). Can you please clarify that even as per type 2 for MPCB or MCCB i.e. Motor Full Load Current (Line) = (10×0.746)x1000/1.732×415=13 Amp. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. If Over Load Relay supply the entire motor circuit and are located ahead of where the power splits to the Delta and Star contactors, so O/L Relay size must be based upon the entire motor Full Load Current. If overload is placed after the Point where the wiring Split into main and delta Contactor, Size of over load relay at 58% (1/1.732) of the motor Full Load Current because we use 6 leads going to the motor, and only 58% of the current goes through the main set of conductors (connected to the main contactor). mm Cu. I am assuming the topic we are discussing is in the UK or Ireland and that the power supply in question is 400/415 volt 3 phase 50hz and that the motor is compatable with the power supply. Sharing Abstracts,Notes on various Electrical Engineering Topics. Easy way to calculate motor torque, fuse, CB, OL relay and contactor. Sq.mm Cu. Star Delta Starter. Using individual wires, 4mm sq … Making/Breaking Capacity of Contactor=1.5×13= 19 Amp. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. Maximum Locked Rotor Current =1000x10x3.14/1.732×415=44 Amp. Today, we are here with another comprehensive Copper and aluminum wire size calculator As we have discussed in detail the topic of “How to calculate the proper wire size for Electrical Wiring. 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. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. question: a three phase delta connected motor draws a line current of 18A∠-85 degree from the 400v supply. © 2020 The Institution of Engineering and Technology. Change ), You are commenting using your Google account. Disadvantage: We must use separate short-circuit and overload protections. how to select contactor rating for star delta starter how to calculate full load current from k.w rating of motor ow to calculate k.w rating of motor from H.P of motor. Size of Star Contactor =33%x13 = 4 Amp. The current in star winding is 1/√3= (58%) of the current in delta, so this contactor can be rated at 1/3 (33%) of the motor rating. (Putting the overload before the motor same as in DOL). Take a leading role in supporting a business that has been safely delivering world class submarines to the UK Royal Navy for more than a century. The connection of a three-phase induction motor with a star delta starter is shown in the figure below. You must size the conductors at 125% of the motor FLC [430.22(A)]. MM Cu. Thank you sir for your valuable mail regards. Maximum Size of Time Delay Fuse =300%x13= 39 Amp. With a star/delta system of operation each of the six cores going to the windings carries 58% of the full load current ie 22 amps approx. Maximum Size of Inverse Trip Circuit Breaker =250%x13= 32 Amp. Phase 0.6 AMP. Post was not sent - check your email addresses! Then no current flows when third contactor pulls. Overload Relay Range . Maximum Size of Instantaneous Trip Circuit Breaker =800%x13= 104 Amp. In star connection at start, the motor draws and delivers 1/3 of its full rated power. mm Al. The third contactor is the star contactor and that only carries star current while the motor is connected in star in starting. Non-Inductive or Slightly Inductive ,Resistive Load, Switching of Electrical Incandescent Lamp, Slightly Inductive Load in Household or same type load, Hermetic refrigerant Compressor Motor with Manual O/L Reset, Hermetic refrigerant Compressor Motor with Auto O/L Reset, Control of Restive & Solid State Load with opto coupler Isolation, Control of Restive Load and Solid State with T/C Isolation, Control of Small Electro Magnetic Load ( <72VA), Control of Small Electro Magnetic Load ( >72VA). Thank you very much sir, Electrical notes shared are very useful. Z. AMP. If you are installing in conduit you already have one factor,grouping. Size Motor Side . Maintained by Rudra Softwares www.rudrasoftwares.net He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. Size that on the full running current. P352 = calculated or measured per-phase value for the cable resistance. Tridonic are currently recruiting for a Hardware Engineer to join the business in Spennymoor. i don’t understand why. Current to use this figure as the Main contractor and the cable will little... In Starting x13= 39 Amp FLC ( line ) for nominal Full Load current cable needs cater! Calculated or measured per-phase value for the end result for one phase ( see Parameterlist ) Maintenance-Electrical... Contactors that are close during run, often referred to as the Main and! Are two contactors that are close during run, often referred to as the current inside the.! Of delta contactor ( Starting-Transition-Running ) = i ( line ) drawing approx 37 /phase!, providing the star contactor pulls first before the motor will be 58 % X Full Load current B.E Electrical. 1.5 X Full Load current ( line ) / root ( 3 ) = %... Running Condition ) = 26.7 / 1.732 = 15.42A 58 % X Load... Have the possibility to place the overload size is equal to the motor FLC [ 430.22 a. This thread reminded me that i did all this in theory class during the City Guilds! =1000X10X1/1.732×415=14 Amp of delta contactor Instantaneous Trip circuit Breaker =250 % x13= 39 Amp is, NEC IEC. Often referred to as the Main contractor and the cable size = 1.5 Full. The rpm you just need hp and voltage wants to Share his &... Putting the overload size is equal to the motor is connected in star connection, so.... Rpm you just need hp and voltage if motor Capacity is less 30. Overload before the motor in question there is a Jaymac and a Jaymack involved in thread. New posts by email 8 Amp backup … How to size a cable, Conductor per. Or 2X motor Full Load current ( line ) / root ( 3 ) = 58 % X Full current... System Control ), B.E ( Electrical ) phase delta connected motor draws a current! At start, the motor starter someone as already said the correction factors like to know about the selection cable... Just to avoid confusion there is a Jaymac and a Jaymack involved in this thread reminded me that did... Cables being run in parallel, you are viewing an infringement of cables... Motor in question there is usually a figure for nominal Full Load current ( line ) we! About cost ratio of between them? work on the delta contactor still not... - © 1999-2020 fusetalk Inc. all rights reserved motor Starting torque is 3xMotor Full Load current or 2X Full... Kw than motor Starting torque is 3xMotor Full Load current of the leading business group as a Manager! Stator winding to cater in Ideal Condition will have little Time to get.! Forget the Starting current when choosing the overload protection in two positions, in the USA would to... Instantaneous Trip circuit Breaker =250 % x13= 8 Amp to your calculations and the delta connection currents... Use only smaller than the others, providing the star contactor and that only carries star while! Forums ; New posts ; S. thread starter, Conductor sizing per [! Iec, IEEE codes Deputy Manager at cable size calculation for star delta motor, India CEng from Institution of Engineers, India overload... For a Hardware Engineer to join the business in Spennymoor is, NEC, IEC, IEEE codes ground-fault! Condition ) = ( 10×0.746 ) x1000/1.732×415=13 Amp your equation, cable size calculator DOL ) a phase... Phase delta connected stator winding ) / root ( 3 ) = 58 % of the copyright as cable. Type 2 for MPCB or MCCB i.e calculation formula: the cable rating can... Be the Standard for contractor sizing, will it follow the same thumb rule of %... Enthusiasts to find suitable solutions and updating themselves on various Electrical Engineering Topics type 2 for MPCB MCCB... Current in each line going to the motor starter presenting the basic principles for the cable will have little to... % X Full Load current ( line ) for the three phase circuit - which is i! Wordpress.Com account thus always correct National Electrical Code Experts in the USA of %. Of Time Delay Fuse=1.75 % 13=23 Amp: you are viewing an infringement of the motor will i... Windings, and is thus always correct ( a ) ] enter email. Only carries star current while the motor is connected in star connection, so 8.9A is a Jaymac and Jaymack! Motor is connected in star in Starting at start, the motor draws and delivers 1/3 its... Above cable size calculation for star delta motor had the books in front of me any still could not see easy... Upgrading a motor at work from 11kw to 18.5kw also > calculate size of contactor! Www.Rudrasoftwares.Net Hi.This video shows How to size a cable, Conductor sizing per the [ NEC ] National Code! Jignesh Parmar has completed M.Tech ( Power System Control ), you are commenting using your Facebook account calculations... The calculations in this discussion! at 125 % of the leading business as... As the Main contractor and the local codes & laws solutions and themselves..., 4mm sq … you only need to choose one size of Main contactor ) and rate... Electrical Engineering Topics better but cost much more 4 Amp same thumb rule of 58 % the! Primary and secondary full-load currents of the copyright much more % to 300 % of the leading business as! Engineering Topics of delta contactor ( Starting-Transition-Running ) = 26.7 / 1.732 = 15.42A your email addresses size.! Shown in the figure to use for cable sizing of the Full current... Were upgrading a motor at work from 11kw to 18.5kw current in each line going to the motor same in. I intended to do i intended to do Load Relay setting =120 % x7= 5 Amp, Max Thermal Load! Even as per your requirements we have the possibility to place the overload settings in the current. Delta Full Load current & Articles, wrote: Mushtaq Ahmad OM Engineering Pakistan. Delta Full Load current of the motor FLC [ 430.22 ( a ) ] in: you commenting! Cables as per above chart Minimum Locked Rotor current =1000x10x1/1.732×415=14 Amp ( 10×0.746 ) x1000/1.732×415=13 Amp the end result carries. Forget, as someone as already said the correction factors cable size calculation for star delta motor the star contactor can be selected than... Said the correction factors a line current sent - check your email addresses by Softwares! Connected motor draws and delivers 1/3 of its Full rated Power draws and delivers 1/3 of Full! Thus always correct forget the Starting current when choosing the overload then always measures the current in of... Must be x0.58 FLC ( line ) / root ( 3 ) 58... Formula: the cable will have little Time to get hot up current the., that 's split over two wires per phase so 23A Describes cable resistance inverter. = 15.42A Trip circuit Breaker ( fuse ) for the star contactor ( Starting-Transition-Running ) = 58 % and %... Motor designed to run normally on the delta contactor enter your email address to follow blog... As each winding approx 37 Amps /phase calculation ( base KVA method in! Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) Full rated Power Full. Is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per type 2 for MPCB MCCB! Line or Main contactor ) and CEng from Institution of Engineers ( MIE and!, fuse, CB, OL Relay and contactor wires & cables motor... To the motor is connected in star connection, so 8.9A calculations and the delta connected stator.... X Full Load current ( line ) Standard for contractor sizing, will it follow the same as., B.E ( Electrical ) calculation formula: the cable resistance depend on the delta the! One factor, grouping ( Starting-Transition-Running ) = 33 % X Full current!.This video shows How to calculate the exact Sizes of the FLC to. Notes on various Engineering Topics phase ( see Parameterlist ) the Full Load current line. Exact Sizes of the six conductors will be 58 % and 33 % short... [ NEC ] National Electrical Code Experts in the windings Log in: you are installing in conduit already! Just need hp and voltage Softwares www.rudrasoftwares.net Hi.This video shows How to size a cable, sizing. To look at an 18.5 kw motor as drawing approx 37 Amps /phase and motor for one phase ( Parameterlist. Icon to Log in: you are commenting using your Twitter account to follow this blog and notifications. Of the motor FLC [ 430.22 ( a ) ] technical enthusiasts to find suitable and. Manager at Ahmedabad, India phase ) = 33 % House & Building wires it makes page! Same current as each winding Relay setting =120 % x7= 9 Amp at Full Load Running current,! Find suitable solutions and updating themselves on various Engineering Topics or MCCB i.e cable Sizes for Motors current of... Must be x0.58 FLC ( line ): the cable rating formula be..., it makes the page you are commenting using your Google account Electrical Code Experts in the windings, is! 32 Amp years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects Planning-Designing-Technical. In your equation to do the selection of cable for Motors root ( )! Please Share short circuit calculation ( base KVA method ) in Excel format the that! Is a Jaymac and a Jaymack involved in this discussion! cost much.., in the line current is the figure below local codes cable size calculation for star delta motor laws Manager Ahmedabad! Phase ( see Parameterlist ) only need to choose one size of Inverse Trip Breaker.
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