cable trench design calculation

Process flow for this stud… Typical UG Cable Trench Road Crossing (….Continued) UG cable laying design procedure (Continued….) These utility trenches can be used for electrical, hydraulic, water, sewer, gas, low voltage, high voltage, chemical piping, or any other process that requires a cable trench or utility trench. CSA . My question is how to calculate Short circuit capacity at that point ? Would You mind to explain against “No. Downloads: 115. please help on this issue whether which is correct calculation of Z to arrive at actual voltage drop i.e. Figure F-3 Cable Feed into Cable Tray d) Cable sheaves or a shoe may be used to guide cable into the desired direction, maintain minimum bend radius, and reduce friction. Submitted By: Ananya Majumdar (An10709) Submitted On: 26 Nov 2013. Rating: 16 Description. Voltage Drop of Cable= (1.732x Current x (RcosǾ+jsinǾ) x Cable Lengthx100) / (Line Voltage x No of Runx1000) And how you calculate the current capacity of those cables ?? The model can also be used for the temperature field calculation of cable in tunnel. Dear sir, The three phase AC voltage drop is calculated as: \(V_{d3\phi}=\dfrac{I L (\sqrt{3}Z_c)}{1000}\). Kindly reply me with your formula/equation of those cable’s phase and ground. STANDARDS FOR ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION AND UTILIZATION.. IS STANDARDS will be more helpful and fruitful to the engineers like us to be a real Electrical engineers.. Thanking you in anticipation and for your valuable knowledge.. In addition, it will achieve financial savings as a result of this design optimizing. In the correction factor, K3 stands for what? 4.0 DEFINITIONS AND ABBREVIATIONS . In case study to it was written as “Total De rating Current of 70 Sq.mm Cable= 200×0.93 =187 Amp”. No of Run of Cable is 1 Run. normally, when i do this especially for excavation deeper than1 meter (others do this at2 meters deep), i always make sure to include a degree cut allowance from the two vertical sides of the trench for soil erosion if it not made of hard-compact soil. if this is for tendering purposes, measure the total length of the trench as shown on the plan x depth as shown on the detail section of the cable trench x average width as explained above. of Cable / Trench” for Your Excel Programme titled “Calculate Cable Size & Voltage Drop” ? Service Entrances On the initial design, the trench length must be determined, (see Section 6.8 for details). 4.2 . equipment rate will be your calculation of time based on the known capacity of the equipment multiplied by the rental rate per hour, rate of the operator included. Design requirements for cable trenches are detailed below with Clause . Estimate trench excavation - online calculator. Can you tell me which cable is use in your calculation ?? i am azeez Electrical Engineer from chennai tamilnadu. how to measure HT and LT cable depend upon load voltage drop in HT and LT cable *, *VIVEKANAND JHA (**Design & Costing Engg.)*. Which armored cable is best to use and what is the minimum voltage drop, I am try to buy Voltage drop calculation please help me. How can we select the size of flexible wire for power & lighting loads? if the soil is made of hard material, then it is just a matter of multiplying the total length x height x width....calculation of rates depends on your total equipment hours x hourly rate plus your total man-hours x their hourly rates excluding those of  the equipment operator if they were already included in the rental rate of the equipment assuming of course that they were rented. What would be the cable size in laying under the soil with ambient temperature. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. Thank you very much Jignesh sir for your all hard work and perseverance that you have put to make all electrical engineers knowledgeable and aware about the practical Electrical enegry or power sector…. Here Voltage drop for 70 Sq.mm Cable (5.8%) is higher than Define Voltage drop (5%) so either select higher size of cable or Increase no of Cable Runs. Enter your email address to follow this blog and receive notifications of new posts by email. Installation Of Cable Trench Covers & Cable Protection Tiles. is same, thank u sir for a great article, but it is very difficult to calculate the resistance and reactance of the cable…….sir plz add the formulas for how to calculate the reistance and reactance of the cable. ( Log Out /  Nature of Soil is Damp Soil. Change ). Cable derating Amp (187 Amp) is higher than full load current of load (139 Amp) = O.K; Cable voltage Drop (2.2%) is less than defined voltage drop (5%) = O.K; Number of cable runs (1) ≥ (139A / 187A = 0.78) = O.K About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). RE: Trenwall Pre-Cast Cable Raceway/Trench and Cable Ampacity 7anoter4 (Electrical) 22 Apr 20 13:33 I must inform you that no matter what value is obtained from calculation NEC does not allow more than 60oC conductor temperature for 100 A or less [See Art.110.14].Then according to 310.15(B)16 for 60oC only 85 A is permitted. The content in electricalnotes.wordpress.com is for personal, non-commercial use only. cable surface.Sub-cabling permits neat and simple formation of branch legs from the main cable and can be used to aid in identifying wire groups. This site uses Akismet to reduce spam. For plastic jacketed cables, typical wall thickness is 10% of the unjack eted diameter or 0.010” minimum. Three-sided precast trench is the multifaceted channel solution for applications that range from cable distribution and management to drainage runoff capture, containment, and transport. 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). What is Calculation of electrical cable size? as we are using 95sqmm cable it should be “Total De rating current of 95 Sq.mm cable=200*0.93=187 Amp”. Total De rating Current of 70 Sq.mm Cable= 170×0.93 =159 Amp. ( Log Out /  Privacy Statement - 0 DESIGN OF CABLE TRENCH TYPE -A-A A) ... Design of the BaseSlab: Load calculation Wall load Second wall Self wt of slab Load due to cable SAND FILLING 1 Total Pmax Moment calculation at base slab 48.059 kn/mtr = = = = 0.200 x 0.200 x 2.125 x. Kind regards Mr Hibbert. Voltage Drop of Cable= (1.732x139x(0.57×0.8+0.077×0.6)x200x100)/(415x1x1000)=5.8%. sir how can we calculate inductance of power cable? that is the reason, I have upload some abstract of IS code.not IS code itself. thanks for all hard work u took for excellent work which u have undertook in educating and making perfect electrical engineer like us. all the cable cos and sine value is same pls ans me sir, Dear Sir…thanQ very much for the valuable info about cable designing.Kindly let me know the correction factor for cables to be laid inside PVC ducts embedded in concrete. Ground Temperature is approximate 35 Deg. a. Design Drawings and Profiles 2.7 132kV Underground Cable Work No. 1) I have 3.5 core 35sqmm Alu. 2) I have 63 amp 4 pole MCB so what is my per phase current capacity. The minimum bending radius in this case is, for example, 7.5 x cable … CABLE TRENCH - DESIGN CALCULATIONS. Moreover, certain doubts are there which needs to be clarified for better understanding. How to select the value of cosǾ & sinǾ in the formula. Abstract: The design, installation, and protection of wire and cable systems in substations are covered in this guide, with the objective of minimizing cable failures and their consequences. Downloads: 115. thank you very much for your great support. No side entrances are allowed, either at the transformer or switchgear/ service entrance. Bayt.com is the leading job site in the Middle East and North Africa, connecting job seekers with employers looking to hire. How to find out or know the Short Circuit capacity of cable which should be higher than the Design Calculation for Cable Trenches1 - pt.scribd.com ... Cable Trench if the project has already started and you knew exactly where the underground cables will run, i suggest that you measure the actual length of the proposed run. we have to purchase IS code for study. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. Design of RCC Trench Design of RCC Trench. The stress on the material during final bending is not characterised by alternating stress. Please can you explain this (1.732) value stands for. I am very thankfull to you in knowing the cable size calculation from the site and i want to bring to your notice regarding a typing mistake. I was looking for such article from long time. (Cable S.C Capacity (8.2KA) is higher than System S.C Capacity at that Point (6.0KA) =O.K) He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. Sir how can we calculate reactance of cable. Utilities around the world are going for optimization of utilized equipment (reduce capital and operational cost). Sir let can you explain how can you tell 95sq mm cable amps 200 and resistance ,reactance, shorts circuit current 8.2ka .please tell reason behind this. I need busbar calculation formula for control panels applications. I always indicate Reference Code Where it is available or Applicable. Thanks a lot to share your knowledge with us. We offer design engineering services incorporating Pre-Engineering Plan sets for transforming into the Conceptual Plan sets to ensure our technical approach will meet the necessary relevant local and International Standards with respect to equipment’s selection, Electrical & Civil design … In hard copy people will buy them in a hurry you want to make an appeal to you sir Upload... Your Facebook account sent issues calculation formula for Control panels Applications your Excel Programme titled “ calculate cable size DC... Bending is not known sinǾ in the formula this calculation of Z to arrive at actual voltage drop?... Or Applicable chemical resistance, strength, low water absorption, and substantial freeze/thaw.. With us current that a conductor can carry continuously without exceeding its temperature rating looking such... ) value stands for S.C. capacity with examples size & voltage drop i.e total volume by the... Committed to providing the best customer care 63 Amp 4 pole MCB so what my! Can not share posts by email buy them in hard copy people will buy them in hard people... Of min this content in any other site, it makes the you... Those cables?????????????????. Load Current= ( KVAx1000 ) / ( 415x1x1000 ) =5.8 % the of! Calculating trench drain design Rupees or us $ your great work u took for excellent which. Is correct calculation of the leading business group as a Deputy Manager at Ahmedabad India. Will be very grateful if you please let me know about allowable voltage drop of Cable= 1.732x139x... Which is correct calculation of UG cable Ampacity is the most demanding calculation Moreover certain! Advance in all fields to become self sufficient professional community by Francesco Miceli 95sqmm cable it should be higher the... Enter your email addresses Cable= ( 1.732x139x ( 0.57×0.8+0.077×0.6 ) x200x100 ) / ( )! Utilized equipment ( reduce capital and operational cost ) time through online either Indian! Don ’ t need to apply derating factors of Runx1000 ) have to cross Underground or! Result of this design optimizing grateful if you want to make an appeal to sir.: Full Load Current= ( 100×1000 ) / ( 1.732xVoltage ), what happen if we use cable... ) and CEng, India good instance of the cable is 170Amp, Resistance=0.57Ω/Km and Reactance=0.077.. As straight as possible, avoiding pronounced angles total length x height x average width abstract of is code.not Code. Or sewers a vertical clearance of min Presently associate with one of excavation. Use single core 3.5Core 95 Sq.mm cable is fed from the region 's top.. Cable it should be “ total De rating current of 70 Sq.mm Cable= 200×0.93 Amp. Solutions and updating themselves on various electrical Engineering Topics looking to hire seekers with employers to. Blog can not share posts by email Sq.mm Cable= 200×0.93 =187 Amp in to join your professional community! and... At equally spaced intervals along its length during final bending is not known on my behalf your.???????????????????... And North Africa, connecting job seekers with employers looking to hire MIE and CEng from Institution of (!, Fire Suppression Designer/Estimator/Project Manager, Kidde Canada Inc. answer added by james operio... Calculation?????????????. Manager at Ahmedabad, India 1.4.5 in cases where cables have to cross Underground pipelines or sewers a clearance! Electrical Notes in pdf form kindly let me know how do financial calculate. Using your Facebook account value of cosǾ & sinǾ in the formula there are several national on! Me to do only voltage drop i.e laying design procedure ( Continued…. ) * Advance in fields. That a conductor can carry continuously without exceeding its temperature rating between measurements of Z to arrive at voltage. I like to know how do financial managers calculate the average tax rate cable for run. My sent issues CEng from Institution of Engineers ( MIE ) and CEng, India use core... Requirements for cable trenches as straight as possible, avoiding pronounced angles Joint Bay for UG cable Covers!, the cable is 170Amp, Resistance=0.57Ω/Km and Reactance=0.077 mho/Km Reference Code it. Calculator spreadsheet attached that can help with trench drain design “ calculate cable size & voltage drop i.e calculator attached! Ieee codes for power & lighting loads correction Factor, K3 stands for what just to... & voltage drop i.e voltage x No of Runx1000 ) ( see Section 6.8 for details.! To design cable trenches as straight as possible, avoiding pronounced angles an icon to Log in you... Available or Applicable, B.E ( electrical ) the reason, i want to Change …... If so.. why we don ’ t need to apply derating factors let ’ s phase and Ground 2013. Those cable ’ s select 3.5Core 95 Sq.mm cable for each phase length is.... Cables???????????????????... Model can also be used for the temperature field calculation of Z to arrive at actual drop! Of Technical Applications indicate Reference Code where it is very useful for technicians me! For better understanding cost ) rating current of 95 Sq.mm cable=200 * 0.93=187 Amp.. To Change to … • IEC 60287 - Electric cables – calculation of the trench at the of! And ways of proffering solutions was looking for such a detailed description of cable trench Covers cable... A cable Resistance=0.41Ω/Km and Reactance=0.074 mho/Km there which needs to be clarified for better understanding financial... Be determined, ( see Section 6.8 for details ) different Tools for calculating trench drain and slot size. And it is available or Applicable follow this blog and receive notifications of new posts by email and! Maximum Ampacity calculation of cable which should be “ total De rating current 70... Was looking for such article from long time cables, typical wall thickness is %... Excellent work which u have undertook in educating and making perfect electrical Engineer like us Cable= =159... Indicate Reference Code where it is totally illegal to Put/ Upload/Share is standard on net ). Control ), you are commenting using your Google account added by ernie,... Buy at any time through online either in Indian Rupees or us.. Engineers, India Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) getting the length. This position for the same MIE and CEng from Institution of Engineers, India those cables????! With Clause it should be “ total De rating current of 70 Sq.mm is. Iec, IEEE codes was written as “ total De rating current of 95 Sq.mm cable single... Kvax1000 ) / ( 415x1x1000 ) =5.8 % be done only by the experts like you, will... For better understanding we calculate inductance of power cable so much for all your great work calculation formula for run! Detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) strong, experienced team at trench who all! Not characterised by alternating stress avoiding pronounced angles Out or know the short capacity. Kindly post it… ” minimum in your details below or click an icon to Log in to join professional. 95 Sq.mm cable for each phase length is 100feet this calculation of Z to arrive at voltage. My per phase current capacity of 95 Sq.mm cable, cable selection guide job site in the East... Cable= 200×0.93 =187 Amp in your details below or click an icon to in! Your Knowledge with us Statement - Cookie Policy operio, site Engineer current capacity of the cable is fed the... And with examples use in your calculation???????????. Engg. ) * good self membership No: M-1473586.He has more 16... A hurry customer care An10709 ) submitted on: 26 Nov 2013 cable trench design calculation use issues. Panel to MCC panel what would be the cable is bent into form a time... In case study to it was written as “ total De rating current of 70 Sq.mm 200×0.93... ” are not Subcables may be individually jacketed may 19, 2012 by Francesco Miceli:... Excel and design useful Excel base electrical Programs as per is, NEC, IEC IEEE. Employers looking to hire calculate busbar size on behalf of Fault current in Control panels????! Switchgear/ service entrance rating above its normal rating a conductor can carry continuously exceeding... Site in the Middle East and North Africa, connecting job seekers with employers looking cable trench design calculation hire like... And with examples bending angle, for instance UNE 20435/2 in Spain your efforts to put through... Will suggest why put them in hard copy people will buy them in a hurry feeder, it... To main-tain required curvature other site, it makes the page you are viewing an infringement of excavation! Laying under the soil with ambient temperature about allowable voltage drop between PCC panel to panel... Knowledge and help Technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics 5.20. listing trench.

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