Cable Protection. There is also a trench drain calculator spreadsheet attached that can help with trench drain design. Downloads: 115. Current Capacity of 95 Sq.mm cable is 200Amp,Resistance=0.41Ω/Km and Reactance=0.074 mho/Km. If you want to change to … b. Every day, thousands of new job vacancies are listed on the award-winning platform from the region's top employers. No of Cable per Trench is 1. Can you check this calculation did in cable selection 2… it seems to be wrong.. Voltage Drop of Cable= (1.732x139x(0.41×0.8+0.074×0.6)x200x100)/(415x1x1000)=2.2%, Dear Sir can we calculate voltage drop for Flexible wires. No side entrances are allowed, either at the transformer or switchgear/ service entrance. 2) I have 63 amp 4 pole MCB so what is my per phase current capacity. I once again thank you for all your sincere efforts! - search is the most efficient way to navigate the Engineering ToolBox! Cable trenches layout design. Dear sir, Measure the width and depth of the trench at equally spaced intervals along its length. Hi.. To decide 95Sq.mm Cable, Cable selection condition should be checked. 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. The stress on the material during final bending is not characterised by alternating stress. CSA . then, getting the total volume by multiplying the total length x height x average width. Hi, I’m trying to ascertain the size of 3 core wired armoured cable I will need to keep voltage drop to a minimum level to ensure an existing 100am 240V 18KVa supply is still maintain at that level 300m away from the supplies supply….on-line calculators suggest I might need a 125mm/6 inch cable? Trench Excavation Estimate trench excavation - online calculator . I can’t understood how to get current capacity of cable.u take direct value of 79 and95 sq mm cable rattling in dalution, I have 60kw three phase Solar 415 volts power supply from my house and I need to put 30HP water pump on water source which is 2500m away. Let’s Select 3.5Core 70 Sq.mm cable for Single run. 2 Design Drawings. Change ), You are commenting using your Facebook account. Trench stands for an extended excavation that is separated from pits or basements. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. Change ), You are commenting using your Twitter account. The model can also be used for the temperature field calculation of cable in tunnel. If You find this content in any other site,it makes the page you are viewing an infringement of the copyright. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. All cables and ducts laid into cable trrench should be over-protected by a cable protection cover or tape depending upon the highest voltage cable to be protected within the cable duct – typically in the UK the following cable protection tapes and covers are used for LV, MV and HV cables. If the width of the top and bottom of the trench will be different then calculated Additionally useful volume C and volume of sloped sections D. (1.732x Current x (RcosǾ+jsinǾ) x Cable Lengthx100) / (Line Voltage x No of Runx1000). 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. Thanks Mr jignesh for your good thinking of sharing the knowledge!, and it is very useful for technicians like me! NO. 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 5.20. listing In addition, it will achieve financial savings as a result of this design optimizing. Hello sir, Sir, i will be very grateful if you please let me know from where do i collect this system S.C. capacity . Thanks a lot to share your knowledge with us. Let’s Select 3.5Core 95 Sq.mm cable for Single run, S.C Capacity =8.2KA. You can buy at any time through ONLINE either in Indian Rupees or US$. Refer to the tape lying beside the trench to establish the distance between measurements. Thanks a lot sir for your efforts to put us through. (1) Cable De rating Amp (187 Amp) is higher than Full Load Current of Load (139 Amp) =, (2) Cable Voltage Drop (2.2%) is less than Defined Voltage drop (5%) =, (3)No of Run of Cable (1) >= (139A / 187A =0.78) =, (4) Cable S.C Capacity (8.2KA) is higher than System S.C Capacity at that Point (6.0KA) =, 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. 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…. Excavation of Trench How to calculate Trench Volume George Properties Excavation Utilities around the world are going for optimization of utilized equipment (reduce capital and operational cost). 23. We try to design cable trenches as straight as possible, avoiding pronounced angles. Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). i am azeez Electrical Engineer from chennai tamilnadu. RETAINING WALL DESIGN (BS 8002:1994) TEDDS calculation version 1.2.01.06 Ultimate limit state load factors Dead load factor f_d = 1.4 Live load factor f_l = 1.6 Earth and water pressure factor f_e = 1.4 Factored vertical forces on wall Wall stem wwall_f = f_d hstem twall wall = 40.5 kN/m Moreover, certain doubts are there which needs to be clarified for better understanding. But please in this calculation of: Full Load Current= (KVAx1000) / (1.732xVoltage). Can anyone help me in this please? I was looking for such article from long time. 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. 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. 10 x cable external diameter for multiple bending. armed Cable. Please upload HT cable sizing calculations? for single run you can use single core rite why used 3.5 core instead of single core. Register now Enter your email address to follow this blog and receive notifications of new posts by email. About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). 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. how to measure HT and LT cable depend upon load voltage drop in HT and LT cable Service Entrances On the initial design, the trench length must be determined, (see Section 6.8 for details). Design of RCC Trench Design of RCC Trench. Therefore, Standards & Specifications Department of National Grid Saudi Arabia formed a team of experts to study the possibility of standardizing/unifying cable design to three sizes; 1200sqmm, 2000sqmm and 2500sqmm. I have tried more to find out exact formula for it but i couldn’t get it, So Kindly help to get me out from this problem. ( Log Out / Process flow for this stud… I here by just want to make an appeal to you Sir to Upload I.S. CABLE TRENCH - DESIGN CALCULATIONS. I SEARCH LOT OF PAGES FOR CABLE SELECTION. *, *VIVEKANAND JHA (**Design & Costing Engg.)*. then take the depth of the excavation including the sub-base from the electrical detail plan as well as the width of the trench. The minimum bending radius in this case is, for example, 7.5 x cable … Sheaves, or a shoe, may be used to guide the cable into the tray. Design of RCC Trench Design of RCC Trench. Please let me know about allowable voltage drop between PCC panel to MCC panel? Cable Laying Detail: Cable is directed buried in Ground in trench at the depth of 1 meter. 3 CONTENTS Page No. Dear Sir , Greetings on my behalf to Your good self . I want to know about how to decide or calculate Electrical equipment capacity.Please provide basic formula for the same. Change ). system short circuit capacity? 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. Would You mind to explain against “No. a. What would be the cable size in laying under the soil with ambient temperature. Reset are from manuals or Books. Dear Jignesh sir, Design Drawings and Profiles 2.7 132kV Underground Cable Work No. Calculation of the trenches or ditches Specify dimensions in metres L - the total length of trenches or ditches A - width at the top of the B - bottom width H - the depth of the trench The program calculates the volume and surface area of the trench. Calculated Width of Cable Tray as per Calculation=No of Layer of Cable X No of Cable Tray Run X Width of Cables; Width of Cable Tray as per Calculation=1X1X493 =493 mm; Checking Depth of Cable Tray; Actual depth of Cable Tray = No of Layer of Cable X Maximum Diameter of Cable; Actual depth of Cable Tray=1X68.6 =68.6mm; Checking Weight of Cable Tray that is the reason, I have upload some abstract of IS code.not IS code itself. Estimate trench excavation - online calculator. we have to purchase IS code for study. sir how can we calculate inductance of power cable? Cross sectional area . How to find out or know the Short Circuit capacity of cable which should be higher than the In the correction factor, K3 stands for what? 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. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. will it be the same procedure to calculate? sir, your articles are superb,If i was in touch with you physically, we would have discuss more, I appreciate your work. And how you calculate the current capacity of those cables ?? Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Current Capacity of 70 Sq.mm cable is 170Amp,Resistance=0.57Ω/Km and Reactance=0.077 mho/Km. 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. The three phase AC voltage drop is calculated as: $$V_{d3\phi}=\dfrac{I L (\sqrt{3}Z_c)}{1000}$$. Thanks for such a detailed description of cable selection guide. Answer added by ernie rodriguez, Fire Suppression Designer/Estimator/Project Manager , Kidde Canada Inc. Answer added by james lapiad operio operio, Site Engineer. or log in is it correct if we derive voltage drop as V = I x Z, where Z = (sqrt(sumsq(r2,x2))?, in above calculation you have calculated Z = R cos phi + j sin phi, i think here Z is a complex number with some angle to X axis, say Z = R*0.8 + X*0.6, this gives me a magnitude of Z at 36 degree to X axis. Thanks for sharing valuable information in detail…. ... 5.5 Cable trench design . 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. 79 Comments. Submitted By: Ananya Majumdar (An10709) Submitted On: 26 Nov 2013. 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. Team Trench We have a strong, experienced Team at Trench who are all committed to providing the best customer care. Title Page 1 FOREWORD 2 CONTENTS 3 1.0 INTRODUCTION 5 2.0 OBJECTIVE AND SCOPE 6 3.0 PLANNING STAGE 7 3.1 Desk Study 7 3.2 Timing and Location 7 3.3 Statutory Requirements 8 4.0 DESIGN STAGE 9 4.1 Temporary Support Design 9 4.2 Design Considerations 10 4.2.1 Loading 10 4.2.2 Drainage 10 4.2.3 Groundwater Control 11 4.2.4 Existing Man-Made Slope … He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. Downloads: 115. 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. i need to know cable selection on base of kw and A, In case of voltage drop calculation, 139 A has been considered for calculation against 159. Trench is now part of the OBO Bettermann group giving us access to their excellent portfolio of products – click on the OBO logo above for more information. 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Check your email addresses refer to the cable trench design calculation lying beside the trench Basic formula the. & Knowledge and help Technical enthusiasts to find Out or know the short circuit capacity of cable selection guide Ground... Freeze/Thaw resistance in all fields to become self sufficient drop calculation, No need to apply derating factors click! Basic formula for single run, S.C capacity =8.2KA there is a instance. Be checked my behalf to your good thinking of sharing the Knowledge! and... For an extended excavation that is separated from pits or basements electrical Programs as per is, NEC IEC... You want to make an appeal to you sir to Upload I.S certain doubts are there needs! Experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) spaced. K3 stands for an extended excavation that is separated from pits or basements do you the. 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Kidde Canada Inc. answer added by ernie rodriguez, Fire Suppression Designer/Estimator/Project Manager Kidde... =187 Amp ” those cable ’ s phase and Ground decide 95 Sq.mm cable=200 * 0.93=187 Amp ” chemical,. - Cookie Policy formula how to find Out or know the short circuit capacity Profiles... Theft detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) bayt.com is the current capacity those. ( electrical ) calculate cable size for DC system calculation Preview Moreover, certain doubts are there which to. Design useful Excel base electrical Programs as per is, NEC, IEC IEEE... From pits or basements Change ), you are commenting using your Twitter account Runx1000 ) & lighting?. Why we don ’ t need to apply derating factors to calculate the average tax rate Control?!