# Sag Tension Calculator

Sag & Tension Calculations. The good news is that this change of pivot offset doesn't really affect jibstay tension or sag. Force of tension is exerted by many objects such as rope, string, chain, or cable and we call it in different names based on the types of objects in contact. An 18-lb washer load of wet beach-towels is hung on a clothesline. CommScope's SpanMaster software is a tool designed for use in the calculation of sag and tension of single or multiple cable combinations under various environmental loading conditions.

[email protected] For the case of very long spans, catenary formula gives more accurate results than parabolic. August 28, 2015. Data from the tables has also been plotted in two line charts that show sag on 80m-10m center fed flat top antennas at reference tension levels of 25 lbs and 50 lbs. The best thing to do is to add a tension brace in the form of a cable or rod, and turnbuckle, so if the gate eventually begins to sag it can easily be drawn back into square. Dewey, Ocean Networks Canada University of Victoria

[email protected] OAI identifier: oai:iris. Analytic Method to Calculate and Characterize the Sag and Tension of Overhead Lines @article{Dong2016AnalyticMT, title={Analytic Method to Calculate and Characterize the Sag and Tension of Overhead Lines}, author={Xiaoyuan Dong}, journal={IEEE Transactions on Power Delivery}, year={2016}, volume={31}, pages={2064-2071} }. Calculation of Sag in Overhead transmission lines: In an overhead line, the sag should be so adjusted that tension in the conductors is within safe limits. Then the tension is calculated, and the appropriate length of cable is spun with cross-sectional dimensions that are suitable to bear the calculated tension. Southwire has improved the calculation algorithms to reduce the occurrence of these failures. Generally, the tension of a cable immediately as it leaves a bend must not be greater than 300 times the bend radius (in feet), and the maximum sidewall pressure must not exceed 300 lbs. It is not clear from the figure if that location is the low point for the cable. Optimum sag is somewhere between a quarter and a third of the total fork travel – on a 100mm travel you’ll want around 25-35mm of sag. When Supports are Equal: Let, L = length of the span, w = weight per unit length of the conductor, T = tension in the conductor. Usually, instead of making the necessary calculations for the actual span, transmission line designers have simply substituted the ruling span sag and tension data for the actual span sag and tension data. This tool can be found by navigating to the Tools dropdown, under “Tension Table Generator…“. Sag and Tension Calculations 47 - 51 SECTION 8 High Voltage Proof Testing 52 - 53 High Voltage dc Field Testing 52 dc Field Acceptance Testing 52 Test Limitations 52 Test Notes 53 Maintenance Proof Testing 53 Frequency of Tests 53 SECTION 9 Miscellaneous Information 54 - 60 Formulas for Calculating Charging Current 54 Capacitance of Cables 54. 0-m long clothesline to dry. Sag and Tension of Conductor. mm Cable (5. I felt a good starting place once the amount of pressure was known is to calculate the deflection of a 1/4" plate 45" long supported only at the ends. Helps determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Steel Express can accept no liability for. During the time of installation, the conditions were t =15°C and initial horizontal tension = 25% of Rated Tensile Strength (RTS). If it is allowed to grow the chain can sag to the point where the individual slats can catch on other equipment, resulting in damaged chain, conveyor, guarding, and other equipment. Calculator can be used to provide simple mechanical parameters that simplify specification of optical components. It controls the speed, the riders altitude, and the amount of strain the weight of the rider put on the anchors while fully loaded. 965 cm and (ii) a constant horizontal wind pressure of 383 Pa of total projected. Take note that because of the complexity of the creep in a conductor, it is not a factor in these calculations. This equation describes a bouncing spring instead of a hanging cable. Sag is the amount your suspension compresses under your weight and riding gear. CORRECTING FOR SAG. The vertical distance of the conductor to the line connecting both attachment points A and B is called the. MS 1201 slide rule with case, instructions (in Japanese), and box. Operating Tension. RE: Sag tension calculation , referance transmissiontowers (Structural) 29 Mar 13 13:53 Southwire has the rights to the old Alcoa Sag10 program that will calculate sags and tensions for conductors but it is quite expensive. Cable Sizing Calculation. In hot weather, power lines can overheat just as people and animals do. See Sag Recommendations charts for sag distances. Users of the Standard Edition of PLS-CADD are better served by the SAPS plug-in which can also make these calculations, but in a better integrated manner. transmission line with an ice load on one span. Related posts of "Sag And Tension Calculation Spreadsheet". This also worked ok. This online graphing calculator helps you to graph a catenary curve with the given sag value, length and increment value. Fernandez 1 Abstract – The sag and tension values of overhead conductors are influenced by. Sag & Tension Calculations. Cp = [ (P – P0)/AE) * L] P = pull in Newtons. k 1% the product data sheets include specifications on the ε max maximum elongations during operation. " 19,700 N 17,580 N. The charts contain polynomial models of the initial and creep stress-strain, final modulus, thermal elongation, and test temperature data needed for the sag tension calculations. Calculate a real-world example of a catenary. The explanation I've found in my studies goes something like this: If you imagine a wave moving through a string, the molecules of the medium are displaced as it passes through. Read your Rising Sign as well as your Sun Sign in each Monthly Horoscope Forecast. Should only be used in patients who are alert and oriented, presenting within 14 days of headache, without history of head trauma or fall in the past 7 days. PLS-CADD has built in sag-tension routines. Tension is not carried from one side of the structure to another but the conductor tension is terminated at deadend structures. In order to find the maximum tension is necessary to calculate the effective tension, that is, the force required to move the conveyor and the load at a constant speed. This new tool can be thought of as an accompanying feature to using the Tension Sag Calculator. Catenary Curve Generator Author: Ray Garlington Description: Use this curve for tarp edges and hammock ends. The best thing to do is to add a tension brace in the form of a cable or rod, and turnbuckle, so if the gate eventually begins to sag it can easily be drawn back into square. The mechanical sag estimator should work in all operating condition of the conductor. Purchase SAG10 ® Software the industry standard for calculating sag and tension. You need to know the exact length of the line (the distance between the anchor points/trees), the desired tension in daN(kg), and the weight of the slackliner who will be walking. The Lineman's Pocket Reference - Guy Wire Tension Calculator. Please reduce your quantity or change your pickup store to check stock nearby. Finally, many of the current tension reading load cells must be installed on the grounded end of insulators holding the line at dead-end structures; and as a result, calculations cannot be performed on all spans. SouthwireTM SAG10® Version 4. 338 To calculate tension T at any point P(x,y) on the wire But (10. This sag will cause the recorded distance to be greater than the length being measured. The calculation of sag and tension can be quite useful to the cable television engineer. Thus the tension calculation differs from that of a typical line structure. 0 bath property. structural redundancy in suspension bridges 5. Sending completion. sag and span Sag is defined as the different in level between points of supports and the lowest point on the conductor. Under uplift conditions, lowpoint sags become imaginary sightedsags have significance. Use two reference points. xlsm Member Design - RC Two Way Spanning Slab 03-09-15 CONSULTING E N G I N E E R S All Beams Beam y Sag Beam y Hog Beam x Sag Beam x Hog Made by Date Chd. conductor tension. Sometimes conductor stringing tensions are supplied as mid-span sags since before the advent of LineSmarts sag was easier to measure than tension. Span having equal level supports is called level span, whereas when the level of the supports is not at an equal level is known as unequal level span. On an inclined conveyor, it is usually in the vicinity of the loading zone. • Maximum tension so that structures can be designed to withstand it. ) (feet) - (inches) (feet) - (inches) (lbs. Engineering Calculation Sheet Consulting Engineers OK Member Design - Reinforced Concrete Two Way Spanning Slab BS8110 v2015. 6 lbs/ft3 |. Home / Mathematics / Others; Calculates a table of the catenary functions given both fulcrum points or the lowest point. Recommended for you. Referring back to the heavy loading district Sag/Tension table for 477 AAC presented in Part 2 (May/June issue), the final tension of the conductor at 0 degrees F. What is the sag value?. However, it can be reliably approximated by a parabola. You’ll need to convert the weight units to Newtons. CORRESPONDENCE. The charts contain polynomial models of the initial and creep stress-strain, final modulus, thermal elongation, and test temperature data needed for the sag tension calculations. RE: Cable tension formulas kslee1000 (Civil/Environmental) 4 Apr 09 09:12 I afraid there is no "less" painful way to handle this analysis, unless there is a black box program claims it can do it, and results were proven true (quite a few structural programs had flunked in this regard - foundamental mechanics, in the past). pls-cadd/lite Developed specifically for Joint-Use type applications, PLS-CADD/LITE is the ideal tool for quick sag-tension, clearance and loads calculations. 1 Sag and Tension The catenary of 33kV overhead line between two supports erected about the same level is shown in Figure 1. Catenaries, catenary equations, Sag-tension calculations, Initial, Final and Creep conditions, Wind and Ice loading, Ruling span, Wind span and Weight span concepts, Tower uplift , Wind-induced conductor motions Electric and Magnetic Environmental Ef-fects, Electric field, Magnetic field, Corona, Radio and Television noise, Audible noise, EMF. Deadend Tension Calculator. SAG10 is a sag-tension calculation software. 2 Final unloaded sag. Each participant will work with pre-defined Standards and Design Criteria and will have an opportunity to work with interactive sag and tension calculations. The length of the lifeline system. pdf), Text File (. The rope must sag sufficiently so it won't break. CommScope's SpanMaster software is a tool designed for use in the calculation of sag and tension of single or multiple cable combinations under various environmental loading conditions. S =W t l²/8T. , Aluminum Company of America, Graphic Method for Sag Tension Calculations for A1/S1A (ACSR) and Other Conductors. please explain in detail. 475 or CSA G12 specifications. 2016; DOI: 10. Abstract: While normal sag and tension calculations based on the `equivalent-span' concept are satisfactory, when applied to transmission lines located in a reasonably undulating terrain, the answers obtained by this method are inaccurate for mountainous terrain. Calculation for conductor. The initial and final temperature stated are according to the average temperature of Malaysia. pdf) or read online for free. the tension could be up to 900N. Pay-off stress sag calculation code requirements In the design of wire pay-off stress sag, we should first select meteorological conditions and safety coefficient calculation. right of point A. Most of this work makes use of the widely accepted “ruling span” method of sag-tension calculation for multiple suspension spans. After loading the conductor to a full load tension of 33,362 N, the immediate sag at minus 18 °C with no ice and no wind is 2906 mm, and the tension is 17,580. Maximum dc Code overall Rated resistance Name Steel Total Aluminium Steel diameter Aluminium Steel Total Strength at 20 oC AWG or AWG or MCM MCM TURKEY 6 13. ) Sag is a phenomenon which can occur at the point of minimum tension in the carrying strand of a conveyor belt. You will need to input values for the span, sag as depicted in the image, as well as the weight of the load. The supports are assumed to be rigid. The sag- and hog-critical sections are defined by the maximum of required tension reinforcement. This paper presents a method for the sag-tension calculation of overhead conductors that is characterised by the creep sequential calculation. Hence normal tension Pn may be found as, Cp = Cs. If you pre-tension the wire 10 pounds, the sag is about 1. Four different cases of temperature and wind are tested to calculate sag and tension. I just need it to calculate a Dyneema rope sag that will be used as a cable way with a payload of 0 and 50 pounds at 20% of the maximum breaking strength tension at normal summer temperatures. CATENARIES, CALCULATIONS. While technically correct it makes no practical difference to BA's answer. e-cigre on-linelibraryandbookstore Reference:324 Type: TechnicalBrochures Title: Sag-Tensioncalculationmethodsforoverheadlines Abstracts FIRSTEDITION:JUNE2007. View how the curve and the data (k, tension and sag) are responding to the changes of cable length L, distance D between its two ends and the weight per unit length (W/L). Tension some more and reduce the sag to. If the sag is too large, it may cause a short circuit between the line and objects below it or a short circuit between lines in extremely windy conditions. 0007 pounds per foot. Sag-Tension Charts Charts referred to during wire stringing that give conductor tensions related to ambient temperature for use during the sagging operation. XLP Poly AWG/kcmil inches AWG/kcmil lbs inches lbs/kft lbs/kft amps amps. Priebe}, journal={2000 Power Engineering. The designer then specifies the bolts needed to carry this tension force at the rafter-joist connections. Therefore, in actual practice, a compromise is made between the two. Recommended for you. but I want to calculate the sag & tension wire between termnations' equipment in the power substation. Assume that once attached, the metal deck will provide lateral support for the purlins; therefore the sag rods need to be designed for the purlin weight only. The user should understand first the fundamental concepts of sag-tension so that he can appreciate the equations and the result. This tool will quickly estimate rod lengths for three different tie rod configurations. The tension at supports is nearly equal to the tension at any point of the conductor. Cp = [ (P – P0)/AE) * L] P = pull in Newtons. This sag needs to be taken into. This home was built in 1959 and last sold on 4/9/2015 for $912,000. TE = TC + TL + TH TC = F1 x L x CW. Appreciate any help with this. In this example we will calculate the sag and tension if the conductor supports are at different elevation. You could create anything from simple spreadsheet to Sag And Tension Calculation Spreadsheet that feed off of massive data sets—the options seemed endless. com, among which will be the Excel Spreadsheet Template above which is often helpful for different decides. Bus Bar Sizing Calculation IEC-865P-1,IEEE 605-2008, IEC 1597; Short Circuit Force Calculation IEC-865 P-1, IS 802; DSLP Calculation IEEE 998-1996 IS 2309; SAG and Tension Calculation IS-802P-1; Cantilever Strength Calculation IEC-60865 P-1, IS-802 P-1; Transformer Sizing; CT/PT Sizing(VA - Burden & Knee Point Voltage). 2016; DOI: 10. You will now use the shape to help determine how the tension force in the cable varies along its length. Pull needed to move belt and load horizontally: E= F x (P+M) Tight Side Tension. The pull for which these two corrections neutralise each other is called 'normal tension'. What is the typical process to get budget estimates on projects? Once Structura has obtained the required. Hoover Fence has been a supplier of fence and fencing related materials for over 40 years. Some of these factors are temperature, objects settling on the wire, ie. Calculate the midspan tension T0 in each of the main cables and the compressive force C exerted by each 'cable on the top of each tower. 10 corrects this issue. Calculation of Sag & Tension Calculation of sag and tension in transmission line depend on the span of the conductor. SAGSEC allows engineers to perform the previously difficult analysis of strain bus configurations in substations. Get it today at your convenience. The conductors are attached between two supports with perfect value of sag. The sag is obtained from the tension value, the span length and the weight per length unit of the conductor. Run more sag if you like a soft, plush ride, less if you like things firmer. However, when dealing with an anchor like a horizontal lifeline, things get more complicated. Pole Num – set by the user in the data entry panel. Also, perform sag and tension calculations overhead lines. It controls the speed, the riders altitude, and the amount of strain the weight of the rider put on the anchors while fully loaded. But as the wood dries and shrinks, the compression may be lost and the gate may sag. O-Calc® Pro Sag Tension Calculations Explained This document is a primer that explains how O-Calc® Pro software system handles the tension and sags on cables that are attached to a pole. 03 feet (about 3/8 of an inch). Perhitungan sagging and tension umumnya digunakan untuk penggambaran andongan (sag) diatas kertas gambar kerja profil memanjang (longitudinal profile) yang dengan skala gambar tertentu (umumnya digunakan skala vertikal 1 : 400, dan skala horizontal 1 : 2000). co-efficient of friction between the belt and the pulleys is 0. Developed specifically for Joint-Use type applications, PLS-CADD/LITE is the ideal tool for quick sag-tension, clearance and loads calculations. The deviation anchor force calculator assumes a stationary load and 100% efficiency, breaking with the assumption of a 0. SAG-TENSION CALCULATION METHODS FOR OVERHEAD LINES. The distance that a cable will sag depends on the length of the conductor span, the weight of the conductor, its init ial tension, and its material properties. Appreciate any help with this. 01-28a nesc medium loading zone (nc, sc, oh, ky) initial conductor sag and tension -. 5 Unstressed Conductor Length When line installations require. transmission line conductor ice loading basics and tutorials When a conductor is covered with ice and/or is exposed to wind, the effective conductor weight per unit length increases. The 1,260 sq. I'm attempting to derive a formula that will calculate sag and stay tension, given the stay length and sail area. 4 Ruling Span Concept 15-18. The LD Calculator By Paul Pelletier Software The LD Calculator is a small application dedicated to people who work in the lighting industry. 7 describes the St. Because, low Sag means a tight wire and high tension, whereas low Tension means a loose wire and increased Sag. The Hammock Universe Hang Calculator There’s no better feeling than kicking back and relaxing in your hammock on a hot summer day. Step 6: Set Rear Loaded Sag Also known as race sag, loaded sag is the amount of suspension displaced by the load applied to the vehicle; for example, the weight of the rider plus gear, luggage, etc. To calculate the compression spring rate of this spring, divide the load of 20 pounds by the distance traveled of 2”. 10 corrects this issue. 1 the Sag-Tension-Temperature mechanical calculations are performed at the start. Related Topics. 0000096 in/in-°F (from 32°F. It also helps to correct tow vehicle sag, improve steering and stopping, and—when used with sway control—correct trailer sway. Discussion on ¿Sag and tension calculations for mountainous terrain¿ Autorzy, Treść / Zawartość. Calculation of Sag & Tension Calculation of sag and tension in transmission line depend on the span of the conductor. zero line: fulcrum points lowest point; sag a1 ＞0; sag a2 ＞0; sag a3 ＞0 Customer Voice. Conveyor pulleys and shafts of a larger diameter are better equipped to handle. Calculation for conductor. Suppose you are asked to calculate the tensions in the three ropes (A, B, C) that are supporting the 5-kg mass shown below. A direct method for sag-tension calculations [includes discussion] Abstract: Transmission line design engineers are always confronted with the problem of determining sags and tensions in overhead transmission lines. Therefore, in actual practice, a compromise is made between the two. Avoid surges and jerks during pulling by using properly adjusted reel brakes. ) Green timbers, in particular, will sag if allowed to dry under load, although partially dried material will also sag to some extent. To calculate the total sag, set x equal to L /2, which makes y equal to the distance from the top of either tower - that is, the sag value: Example: The tops of equally tall adjacent transmission towers wires are 200 m apart. Creep is not considered as a factor in final sag in this calculation. It is because of providing safety of the conductor from not to be subjected to excessive tension. Additional tension required to prevent slippage on drive pulley: E 1 =E x K. 2 Approximate Sag-Tension Calculations 15-10. Size 8 6 4 2 1 1/0 2/0 3/0 4/0 266 336 477 636 795. Pondera’s new program adjusts unitweight featurecan designengineer. The overhead line sag dependence on weather parameters and line current Elisabeth Lindberg As the demand for energy increases, as well as the demand for renewable energy, Vattenfall, as network owner, receives many requests to connect new wind power to the grid. Im not quite sure why tension affects wave speed the way it does. Edited 11/6/2008 9:45 pm ET by edwardh1. As designers push conductors further out in the loading curves, root failures during the sag tension calculation can become a problem. Weight of slacker, either lbs or kg (both work) # of Pulley Sheaves. To calculate the total sag, set x equal to L /2, which makes y equal to the distance from the top of either tower – that is, the sag value: Example: The tops of equally tall adjacent transmission towers wires are 200 m apart. Helps to estimate and manage cable installation projects. If it is allowed to grow the chain can sag to the point where the individual slats can catch on other equipment, resulting in damaged chain, conveyor, guarding, and other equipment. The distance to the roof edge. The wire sag was also considered, and the sag formula of inclined parabola of wire was according to reference [4], then the sag of any point in the space wire is where f is the wire sag with the unit m. If the designer does not have a basis from which to establish a probable range of conductor tensions, it becomes necessary to assume a conservative design tension, to manage the risk of underestimating loads or sag. For your convenience, compressed shock measurements have been provided. 3 Dead-End Span Sag and Tension Equations: Most conductor sag and tension calculations are theoretically based on a simple dead-end span of conductor supported at equal elevations. l be the length or span of the conductor and T be the tension of the line. 22 Denison Rd , Sag Harbor, NY 11963-3424 is currently not for sale. You may have to register before you can post: click the register link above to proceed. SAPS S tructural A nalysis of P ower and communication S ystems. Conductor weight - Sag of the conductor is directly proportional to its weight. The pull for which these two corrections neutralise each other is called 'normal tension'. pls-cadd/lite Developed specifically for Joint-Use type applications, PLS-CADD/LITE is the ideal tool for quick sag-tension, clearance and loads calculations. 5" bushing=75%. For use in the case of supports on sloping ground, i. Sag & tension versus temperature; Incorporate multiple spans between end-to-end structures; Utilize level spans of unequal lengths; Resolve spans of unequal length with different horizontal planes; Calculation includes the effects of temperature, wind, & k factor. Firstly the tributory width d should be 3d as only every third rafter is tied; also the un-tied rafters push on the wall plates which span between the tied rafter ends bringing in 2/3 of the load on the tie and adding to the bending in the tied rafters. Roebling and the Design of Suspension Bridges 1. The Transmission Line Tool on Mobile (TLTM) Ruling Span Sag Calculator performs quick calculation of mid-span sag as well as three-wave return time with known conductor tension and unit weight. The sag template is usually made up of transparent celluloid, perplex, or sometimes cardboard. 0003 feet, or about 3/1000 of an inch. For a small span ( up to 300 meters) parabolic method and large span ( like river crossings) catenary method is used for the calculation of sag and tension. Sag is very small with respect to the span of the conductor. 20-kg bathing suit in the center of the 6. The disco ball show below is suspended by 2 cables. 0 is likely the strongest choice for the job. In the absence of finite element analysis tools or software (ex. If we run a sag/tension program for each of the span lengths and limit tension to 90 percent of the NESC limits, we will find that the final tensions vary greatly span to span even though the tension limits are the same. Sag word is related with transmission line in electrical engineering. Because of this, the equation can also be given as T = mg + ma. Should only be used in patients who are alert and oriented, presenting within 14 days of headache, without history of head trauma or fall in the past 7 days. Since L is the half-width of the roof, the load should be W, not W/2 and there are other serious things wrong with this. Finding the intersection of the 10ft sag mark and the second darkest green curve shows that the tension is a little over 700lbf. To measure catenary sag, the chain needs to be under tension, in operation and observed from a safe distance to avoid injury. Force or tension exerted is calculated by providing the mass and acceleration of the rope. Simulation setup is done in ETAP (electrical transient and analysis program). Flow chart of the computations for system performance As shown in Fig. Sag tension for conductor (ASCR) Temperature variation ºC 0 32 75. All phases (or. I never could reproduce your sag(s). Helps to estimate and manage cable installation projects. It may be obtained by equating the corrections for pull and sag. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Xls for sag tension transmission line design, quarry, aggregate, and different kinds of minerals. 3 Dead-End Span Sag and Tension Equations: Most conductor sag and tension calculations are theoretically based on a simple dead-end span of conductor supported at equal elevations. Satcon - Satcon is an ISO 9001-2015 certified Design, Engineering and Consultancy firm for Large EHV Substations (upto 400kV), EBOP of Thermal & Solar power plants, Power distribution system of various type of. PLS CADD), the ruling span is used to calculate sag and clearances on the plan profile drawing, and it is necessary in structure spotting. Related posts of "Sag And Tension Calculation Spreadsheet" Management Science The Art Of Modeling With Spreadsheets Pdf Worksheets are simpler in case you have never before followed a budget because you are able to set them on your fridge or some unique visible location where you won't fail to fill them inside. Taut, slack A chain should be replaced when its length becomes _____ longer than the original length. How to use PLS-CADD/Lite to quickly produce a sag-tension report. Creep is not considered as a factor in final sag in this calculation. Tension is not carried from one side of the structure to another but the conductor tension is terminated at deadend structures. To reproduce the equations used in the deviation anchor force calculator, we set exp (-mu*theta) equal to 1 for 100% efficiency. ''Guy Wire Length Calculator'' Input either 2 sides or one side and one angle. 0% of the center-to-center distance between the carrying side idlers during. الترخيم في خطوط النقل الكهربائي sag and tension calculation 5:33 م 1 بسم الله الرحمن الرحيم الحمد لله والصلاه والسلام على اشرف الانبياء والمرسلين ام بعد: الترخيم في خطوط النقل الكهربائي: في. Say you have a line that is 50 feet long. Also, perform sag and tension calculations overhead lines. The rated voltage of lightning arresters shall be 9 KV (rms). 0 is likely the strongest choice for the job. Appreciate any help with this. Because of this, failure of an inlet in a sag configuration often represents a threat to the successful operation of a storm drain system. To measure catenary sag, the chain needs to be under tension, in operation and observed from a safe distance to avoid injury. Antonyms for Voltage sag. The tension in each point of the conductor acts always tangentially. The ALCOA graphic method traditionally has been used to calculate sag-tension. Flow chart of the computations for system performance As shown in Fig. When the rode is slack, the catenary curve presents a lower angle of pull on the anchor or mooring device. If you are unsure of the sign of your Ascendant, you can determine it by entering your data below in this Ascendant/Rising Sign Calculator: You need to know your birth time in order to determine your Ascendant. ค่าของ x ที่ได้รับข้างต้นอาจถูกทดแทนในสมการ (5) เพื่อคำนวณค่า sag ที่ OA สมการ (8) แสดงให้เห็นว่าจุดต่ำสุดอยู่นอก span AB ดังนั้นตัวนำใน. A Tension Control Bolts consists of 1 bolt, 1 nut and 1 washer, pre-assembled and there for they are shown, 1 lot number, on the certification paperwork. Usually, instead of making the necessary calculations for the actual span, transmission line designers have simply substituted the ruling span sag and tension data for the actual span sag and tension data. Substituting values, 200 lb. From determining how high you'll need to install a. Tension, Antennas 80m through 10m. and 0,2 % for steel cord belts. A computer programme to calculate sag and tensions in slack chain is programmed. The tension at supports is nearly equal to the tension at any point of the conductor. tension fabric and lightweight aluminum frame, this 8-foot wide display, combined with the lightweight canvas carrying case, is the perfect portable display. Contact customer service for a cable designed to your exact specifications. To vary the experience on longlines, you can do more than just add more length. The Alcoa Graphic Method is based on analysis of the stress-strain behavior of the complete conductor and its component parts. • Minimum sag to control structure uplift problems. Sag is the amount your suspension compresses under your weight and riding gear. Inclined Conveyors: HP= ( (P x B)+ (P+M)x F x S)/33,000. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. Sag span curve is like parabolic. • H/w during “coldest month” to limit aeolian vibration. Because sag in chain drives is a variable, the maximum and minimum sag can be obtained by numerical calculation. The voltage sag starts when at least one of the rms voltages drops below the sag-starting threshold. More specifically, this computer program calculates the sag of overhead conductors and earthwires for Transmission and distribution lines, enabling you to use a variety of methods to calculate the sag, and also generate a report and save the data for virtually any number of spans and cables. Too much tension and the conductor can snap in cold weather. Normal tension: The normal tension of a tape is a tension which will cause the effects of pull and sag to neutralize each other. This is called the direction of critical loading. CORRECTING FOR SAG. As part of the tension calculation the sag is also calculated. While technically correct it makes no practical difference to BA's answer. These tension limits specify certain percentages of the conductor's rated breaking strength that are not to be exceeded upon installation or during the life of the line. ) (feet) - (inches) (feet) - (inches) (lbs. 63 kg / m and a diameter of 2. Correction for Pull. A transmission line conductor was strung between two towers, 300 meters apart and same elevation. It allows user to explore the effects of different parameters, such as temperature, conductor type, tension span, etc. Normally the tension in conductor is kept one half of the ultimate tensile. The sag template decided the limitations of vertical and wind load. From vertical tension rod truss facades like the NYPH Milstein Heart Pavilion entrance, to a tall steel plate beam and sag rod wall at Massachusetts General Hospital, to skylights with horizontal tension trusses and laminated glass fins at Orlando International Airport or a 150 foot tall cable net. In approximate calculations it is usual to assume that the initial belt tension is equal to the mean of the driving tensions, i. with 1/2 inch of ice and 4 lb. Sag-Tension Calculation Program for Wood Pole Overhead Lines. They will make you ♥ Physics. Sometimes conductor stringing tensions are supplied as mid-span sags since before the advent of LineSmarts sag was easier to measure than tension. For example, 1 kg = 9. Use of separate tension sensors for critical spans enhances the sag estimation process. Looking for a copy of ALCOA sag tension manual 12/21/2010 9:57 AM I have looked in all the places I can think of (including doing an inter-library search from the Syracuse University engineering library) and I just can not find a copy of any of the following manuals. The calculation of proper sags and tensions of conductors and other wires are the most vital aspect of transmission line design; structure heights and placements are determined by the sags, structure designs are determined by the tensions, and lines are constructed using both of these methods. Simulation setup is done in ETAP (electrical transient and analysis program). An alternative method of calculation, which is based on the analysis of the change of state equation for each span of a section in turn, is. Methods to achieve catenary sag and shape adjustments that can reduce sags and increase clearances at certain locations of overhead flexible conductors, cables, strands, or wires to underlying lands, roads, waters, and other objects by permanently adding and attaching essentially concentrated weights or weight of certain magnitudes and positions on the said conductors, cables, strands, or wires. The calculations are used to select the appropriate size support strand for a given application or to determine if clearance requirements are met. So for a 10 foot span between level supports, and 30 pounds tension at a given temperature, the sag at the low point (mid point of the span) is d=wl^2/8T = 0. Safe working tension is about 300 pounds. Page 1 of Analysis Report. Feature-rich for improved sag and tension… Feature-rich for improved sag and tension accuracy sag10FeatureRich. Detailed Syllabus for Substation Design Course, Our Syllabus is Comprehensive,Structured and aim to build design career in EPC Companies,AEDEI Syllabus bases on the EPC Industries , All the Content and syllabus are realated to the industries, AEDEI is providing priactical projects on substration design. A tensile test is done by recording the strain versus stress of an. Related Topics. The brain normally sits inside a bag filled with spinal fluid that extends down from the skull into the spine. Excessive belt sag occurs when the belt tension is low and the belt drops (sags) between the idlers more than normal. Graph the tangents and the tension T at these values on the same graph. SIM pull ® Cable Pull Calculator. The Menai bridge has a cable sag of 46 feet and a main span of 584 feet, and the Verrazano Narrows Bridge has a cable sag of 453 feet and a main span of 4260 feet. The line stretches and so has a noticeable sag, as shown in (Figure 1). Artistic representations of the Brooklyn Bridge Eiffel Eiffel Brunel. The definition of the safety factor is simple. Sag-tension Calculations - Deliverables • Maximum sag so that clearance to ground and other conductors can be maintained. of America, 1927 (OCoLC)608825986. A novel affine arithmetic (AA) based transmission line sag, tension and conductor length calculation for parabolic curve is proposed and the proposed method is tested for different test cases. A method for the sag-tension calculation in electrical overhead lines I. The conductor catenary is very nearly a parabolic shape defined by the conductor ïs weight per unit length (W) and the Horizontal tension (H). Sag is very small with respect to the span of the conductor. #N#Beam Deflection Calculators - Solid Rectangular Beams, Hollow Rectangular Beams, Solid Round Beams. Cristian Militaru, Alcoa Fujikura Ltd. They will make you ♥ Physics. The Menai bridge has a cable sag of 46 feet and a main span of 584 feet, and the Verrazano Narrows Bridge has a cable sag of 453 feet and a main span of 4260 feet. 4 User’s Manual [4] 1. determine sag. Sag/tie rods, hanger rods, tension rods, and rod assemblies. Southwire's Sag10® Software is widely recognized as the industry standard for overhead conductor sag-tension calculations. 11/07/2011 3:59 PM. sag charts and ruling span If this is your first visit, be sure to check out the FAQ by clicking the link above. For general purpose riding, the shock should compress approximately one quarter of its travel. com, among which will be the Excel Spreadsheet Template above which is often helpful for different decides. L = conveyor length (m) ε = belt elongation, elastic and permanent (%) As a rough guideline, use 1,5 % elongation for textile belts. Total tension to move belt and load horizontally: E 2 = E+E 1. Overheads lines are subject to considerable sag and this determines the height of pylons. The nominal discharge current rating of the lightning arresters shall be 5 KA. Detailed Syllabus for Substation Design Course, Our Syllabus is Comprehensive,Structured and aim to build design career in EPC Companies,AEDEI Syllabus bases on the EPC Industries , All the Content and syllabus are realated to the industries, AEDEI is providing priactical projects on substration design. In most cases, this will be somewhere between 75 degrees and 90 degrees. Brace ends are designed to provide fast and efficient guy strands termination in metal building construction. Calculator can be used to provide simple mechanical parameters that simplify specification of optical components. Temperature variation ºC 0 32 53 Wind variation % 0 36 0 75 100 0. The tension of a zip line refers to how tight the cable is. If we select 2 runs, than voltage drop is 2. It develops a Sag-Tension report as well as Stringing Charts for a user definable range of span lengths and stringing temperatures. 1 synonym for power outage: power failure. It may be obtained by equating the corrections for pull and sag. Thus, the creep developed in previous stages. Now measure the distance between the zip tie and the fork seal. So everyone has a clear understanding lets describe what “rate” is. Let’s assume we will install our anchor in the ground about 20 feet from the pole. b) When the supports are at unequal levels. Helps to estimate and manage cable installation projects. Purpose of use Compare with some calculations of mine. Utility Experience You Can Trust. Sag-tension Calculations - Deliverables • Maximum sag so that clearance to ground and other conductors can be maintained. If you sit on the bike with minimal tension on the spring and there is less than one quarter of the shock travel, a lighter weight spring is needed. Weight of slacker, either lbs or kg (both work) # of Pulley Sheaves. What it tells us basically is that. This home was built in 1959 and last sold on 4/9/2015 for $912,000. 14) The tension in the wire at any point P (x,y) in the wire is the product of the y-coordinate of the point and the weight per unit SAG AND TENSION CALCULATIONS Author: Me Created Date:. Because, low Sag means a tight wire and high tension, whereas low Tension means a loose wire and increased Sag. NTC has developed our own software for modeling loads as well as using the latest commercial software including Osmose Ocalc Pro, Sag 10, PLS Pole. Usually, instead of making the necessary calculations for the actual span, transmission line designers have simply substituted the ruling span sag and tension data for the actual span sag and tension data. The tension at supports is nearly equal to the tension at any point of the conductor. Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months. The maximum dip (sag) is represented by the value of y at either of support A and B. Bulletin 1724E-152 Page 5 2. Home > Cold Research and Engineering Laboratory Reports > > Geometry of boom and wire rope tension. Anything pulled, hung, supported, or swung from a rope, string, cable, etc. Total height of drop in middle of slackline with slacker, same units as above. We can furnish the complete rod assembly from rods, to clevises, turnbuckles and, of course nuts and washers. ) (feet) - (inches) (feet) - (inches) (lbs. All manufacturer setup instructions, installation guidelines and safety warnings should be followed regardless of the following calculations. "The amount and shape of the belt sag is primarily influenced by the material weight, the belt tension and the idler spacing, as in the catenary calculation, but also by the resistance to vertical deflection as the troughed belt supports the load similar to a beam with cross sectional stiffness. FIRST EDITION : JUNE 2007 - REVISION : APRIL 2016 ----- This brochure identifies and describes the most essential elements of the sag-tension calculation process and the various mathematical and experimental methods used to predict sag and tension of catenaries over the whole range of conductor temperatures and ice and wind loads: the goal is not to develop a unique calculation method but to. See Sag Recommendations charts for sag distances. sag charts and ruling span If this is your first visit, be sure to check out the FAQ by clicking the link above. An introduction to tension. To reproduce the equations used in the deviation anchor force calculator, we set exp (-mu*theta) equal to 1 for 100% efficiency. The length of the lifeline system. And we're going to be able to determine the sag at particular points along the cable system with concentrated loads. 6: Sag calculation at 80°C without elongation with and without suspension insulator deflection The sag will increase unequal as shown in Fi gure 6 by rising conductor temperatures. How do you calculate tensile strength of a ismc 100 channel? Tensile strength of an object can be found by doing a tensile test. You want to take this into consideration as you don't want your rider's feet to be dragging as they ride. Desbiens, General model for sag-tension calculation of composite conductors, Power Tech Proceedings, IEEE Porto Power Tech Conference 10-13 September, (2001), Porto, Portugal. Priebe}, journal={2000 Power Engineering. , compute the corresponding maximum tension, and compare it to the 280-lb breaking strength; or 2) assume the maximum tension is 280 lb, compute the corresponding sag, and compare it to the maximum permissible sag of 3 in. Sag Change with Thermal Elongation. This is the amount the bike drops when your heavy arse sits on the bike. If you pre-tension the wire 1 pound, the sag is about 15. An electric power line of length 140 m and mass per unit length of 3 kg/m is to be suspended between two towers 120 m apart and of the same height. 01-28a nesc medium loading zone (nc, sc, oh, ky) initial conductor sag and tension -. Antonyms for Voltage sag. Compare this with the tension in the vertical strand. PLS CADD), the ruling span is used to calculate sag and clearances on the plan profile drawing, and it is necessary in structure spotting. For example,. A Catenary is the natural curve generated by a cable or chain (with zero bending stiffness and infinite axial stiffness) when strung between two fixed points. Now let's calculate the tension in the string at the bottom of the circle. Tension Control Bolts assemblies come with their own built in tension control device (spline) to ensure dependable and repeatable tension levels are achieved with each installation. In the absence of finite element analysis tools or software (ex. Hence normal tension Pn may be found as, Cp = Cs. Commonly used for lenses and mirrors. SAG10 is attractive to engineers due to its ease of use, the speed with which sag and tension calculations can be rendered, and. CALCULATION OF SAG (Cont. These spreadsheets below will make your job much more easier, alowing you to shorten the time used for endless calculations of cables, voltage drop, various selections of circuit breakers, capacitors, cable size and so on. While technically correct it makes no practical difference to BA's answer. A play on words for SAG-TEN (TENSION), it is widely recognized as the industry standard for overhead conductor sag-tension calculations, utilizing the Alcoa Graphic Method. Conveyor pulleys and shafts of a larger diameter are better equipped to handle. It controls the speed, the riders altitude, and the amount of strain the weight of the rider put on the anchors while fully loaded. If you use sag boards to sag a span, use this quantity. Sag/Tension and Blowout Calculations For the following calculations, it is assumed that: conductors have been pre-stressed or overtensioned initially so that the effects of creep (inelastic stretch or permanent elongation) may be ignored no span reduction factor is applied conductor stretch is allowed for under blowout conditions. • Maximum tension so that structures can be designed to withstand it. Helps determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. l be the length or span of the conductor and T be the tension of the line. The deviation anchor force calculator assumes a stationary load and 100% efficiency, breaking with the assumption of a 0. The shape of the tape will take is known as (sag) and can be determined mathematically. Exact weights may vary due to exact composition of alloys, the purity of the materials and other factors. LPARA, an existing software at The Trinidad. Feature-rich for improved sag and tension… Sag and Tension Calculation with Creep. The catenary equation is defined using hyperbolic sine or cosine functions. 0 bath property. The shape of sag increases with the increase in the length of the span. Priebe}, journal={2000 Power Engineering. please explain in detail. i) Sag calculation when supports are at equal levels: Lets, A conductor is in the two equal level supports A and B. Rearrange the equation to get: Tension = 20/sin(hang angle). An introduction to tension. Why I say this is that often there isn't enough easement for a proper lead and I believe that is the reason the proper sag gets lost. used to calculate the tension force in the joist. • H/w during “coldest month” to limit aeolian vibration. Sag-Tension Calculations Refinements and Enhancements Made by Trimble Energy Solutions by Jacques Hamian and Yair Berenstein Abstract Sag-tension programs have traditionally calculated the conductor s sag-tension characteristics using the ALCOA graphic method By refining the input used in this equation and augmenting. For your convenience, compressed shock measurements have been provided. Level span sag can be calculated by the approximate parabola method: S = WcL^2 / 8Th. xlsm Member Design - RC Two Way Spanning Slab 03-09-15 CONSULTING E N G I N E E R S All Beams Beam y Sag Beam y Hog Beam x Sag Beam x Hog Made by Date Chd. Lectures by Walter Lewin. Sag Correction zIf the tape cannot be supported for its length then it will hang freely under the influence of gravity. We will reply you in 24 hours. Catalog Record: A. SIM pull ® Cable Pull Calculator. thenavalarch. For example if you had a 20’ cable span the sag would be 12”. Exact weights may vary due to exact composition of alloys, the purity of the materials and other factors. Sag & Tension Calculations. Aim for 30-35mm of rider sag. Conductor mechanical calculation methods, known as sag-tension calculation methods, allow the calculation of conductor sag and tension for different conductor temperature, wind and ice load conditions and take into account the evolution of conductor creep during the line lifetime. Horizontal lifelines sag, both as part of initial design and additionally during a fall event. When Supports are Equal: Let, L = length of the span, w = weight per unit length of the conductor, T = tension in the conductor. The test data has been published in "Vari-Ten Tensioner Data Tables, Wire Sag vs. CONDUCTOR DATA SHEET ALUMINUM CONDUCTORS STEEL REINFORCED ( ACSR ) Approx. The deviation anchor force calculator assumes a stationary load and 100% efficiency, breaking with the assumption of a 0. For use with rope multiplier system. We provide a graphing calculator approach to the solutions of the example problems in the catenary demo. 25 m for 132 kV and 220 kV respectively for 00 swing. Looking for a copy of ALCOA sag tension manual 12/21/2010 9:57 AM I have looked in all the places I can think of (including doing an inter-library search from the Syracuse University engineering library) and I just can not find a copy of any of the following manuals. While normal sag and tension calculations based on the `equivalent-span?? concept are satisfactory, when applied to transmission lines located in a reasonably undulating terrain, the answers obtained by this method are inaccurate for mountainous terrain. Press 'Calculate' to find the remaining values. Sag and Tension Calculations 47 - 51 SECTION 8 High Voltage Proof Testing 52 - 53 High Voltage dc Field Testing 52 dc Field Acceptance Testing 52 Test Limitations 52 Test Notes 53 Maintenance Proof Testing 53 Frequency of Tests 53 SECTION 9 Miscellaneous Information 54 - 60 Formulas for Calculating Charging Current 54 Capacitance of Cables 54. PLS-CADD/LITE ™. Because, low Sag means a tight wire and high tension, whereas low Tension means a loose wire and increased Sag. A tow vehicle and trailer combination should alway be inspected at a certified truck scale or weigh station. Recommended for you. 00-10 voltage drop factors for overhead multiplex cables 05. ) Sag is a phenomenon which can occur at the point of minimum tension in the carrying strand of a conveyor belt. Forces during sag: It’s the angle that matters The sagging of the line in relation to its length is significant to the forces in a slackline system. What is the tension in each cable? 2. used to calculate the tension force in the joist. If the designer does not have a basis from which to establish a probable range of conductor tensions, it becomes necessary to assume a conservative design tension, to manage the risk of underestimating loads or sag. Sag and Tension Calculations - Refinements and. SIM pull ® Cable Pull Calculator. I never could reproduce your sag(s). pulled mechanically, use of a tension-limiting device or a break-away swivel in the pull line is recommended. What it tells us basically is that. The Alcoa Graphic Method is based on analysis of the stress-strain behavior of the complete conductor and its component parts. Whereas, if the amount of sag is very high, the conductor may swing at higher amplitudes due to the wind and may contact with alongside conductors. The ALCOA graphic method traditionally has been used to calculate sag-tension. An alternative method of calculation, which is based on the analysis of the change of state equation for each span of a section in. The layout of tension steel bars is defined for both sag- and hog-critical section of the beam. Cable Sag is the amount the zipline drops when a rider's weight is added. PATIL KORADI VISIT INTRODUCTION To study the switchyard, Grid Control Room and. 2 /8T (m) 9. The sag & tension of conductor may be calculated in the following condition:-a) When the supports are at equal levels. It can also be used to determine the catenary when the value of tension is known 4. Ambiguity of form vs. Clearances must be based on the final computed sag of the power line. pdf), Text File (. Home / Mathematics / Others; Calculates a table of the catenary functions given both fulcrum points or the lowest point. Biasanya pada negara tertentu dengan suhu super dingin (katakanlah -20 ˚C) dan goncangan karena tiupan angin yang sangat kencang atau badai perlu dilakukan perhitungan sag tersendiri. Sag/Tension and Blowout Calculations For the following calculations, it is assumed that: conductors have been pre-stressed or overtensioned initially so that the effects of creep (inelastic stretch or permanent elongation) may be ignored no span reduction factor is applied conductor stretch is allowed for under blowout conditions. L = conveyor length (m) ε = belt elongation, elastic and permanent (%) As a rough guideline, use 1,5 % elongation for textile belts. It can be used to estimate the sag even when there are no tension meters to measure tension of the towline. Assuming a parabolic curve and equal height supports, the horizontal tension in the wire is wl^2/8H , where w is the weight on the cable per meter, l is the span, and H is the vertical sag. The world is filled with adventure, new things to experience, and, most of all, hope, with this Ascendant. What is the sag value?. The 1,260 sq. If the sag is too large, it may cause a short circuit between the line and objects below it or a short circuit between lines in extremely windy conditions. Conductor Tension Calculator. Determine the sag and maximum tension in the power line. graphic method for sag-tension calculations | HathiTrust Digital Library. However, when dealing with an anchor like a horizontal lifeline, things get more complicated. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Xls for sag tension transmission line design, quarry, aggregate, and different kinds of minerals. The shape of a curve that a cable assumes when kept hanging at two ends, supported by its own weight is known as catenary arch. Related Topics. sag and tension tables for medium loading areas 22 awg single jacke t figure 8 bhas -25 sag under expected tension unloaded sag span length stringing stringing sag medium loading under medium load after storm (feet) tension(lbs. I'D, GriGri, Eddy or whatever. A field comparison of each method was made using the guyed. The wire sag was also considered, and the sag formula of inclined parabola of wire was according to reference [4], then the sag of any point in the space wire is where f is the wire sag with the unit m. As designers push conductors further out in the loading curves, root failures during the sag tension calculation can become a problem. Example - Increased Force in a Rope due to Angle. It allows user to explore the effects of different parameters, such as temperature, conductor type, tension span, etc. Short Circuit Force Calculations, Sag Tension Calculations, Fault Current Calculation, Earthing Conductor Sizing, Earthmat Design (Step & Touch Voltage Calculations), Direct Stroke Lightning Protection Calculations, Cable Sizing, Lighting Calculation, Equipment Sizing. The initial values above show a nominal 12-inch position transducer range, a total of 15 inches of displacement cable being used to attach to the application, 50° F of temperature change. Helps determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Sag-tension calculation methods allow the calculation of the conductor sag and tension for different conductor temperatures, and wind and ice load conditions, taking into account the evolution of the conductor creep during the line lifetime [1]. If the belt is on the point of slipping, and the effects of centrifugal action are neglected. INSTRUCTIONS: This bulletin is an update and revision of previous REA Bulletin 65-1, “Design Guide for Rural Substations” (revised June 1978). An alternative method of calculation, which is based on the analysis of the change of state equation for each span of a section in turn, is. app’d ckd original issue athr ckd app’d authr date rec’d 10824-a4 3 k. For example, 1 kg = 9. Holding strength is a minimum of 100% of the rated strength of the strand. Where, L = horizontal distance between supports in meters. Year: 2007. Optimal belt sag is 1. The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated. Most of this work makes use of the widely accepted “ruling span” method of sag-tension calculation for multiple suspension spans. Sagging skin is due to two age-related reasons: loss of collagen, which gives skin its elasticity, and loss of facial fat, the absence of which causes skin. But because of the fatality record there is a need for a guideline detailing the type of temporary stability systems according to the type of soil and its holding capacity, methods of installing guywire anchors, integrity of the system, and acceptable. sag and tension tables for medium loading areas 22 awg single jacke t figure 8 bhas -25 sag under expected tension unloaded sag span length stringing stringing sag medium loading under medium load after storm (feet) tension(lbs. This volume is a “how-to” resource for many of the calculations required in rigging operations and is intended to complement “Rigging Engineering Basics” or can be used stand-alone. XLP Poly AWG/kcmil inches AWG/kcmil lbs inches lbs/kft lbs/kft amps amps. It is because low sag means a tight wire and high tension, whereas a low tension means a loose wire and increased sag. PURPOSE: Analysis of cable sag with supports at different vertical levels. Spreadsheets passed us the potential to input, adjust, and estimate anything we needed and store it digitally for reuse. Too much tension and the conductor can snap in cold weather. rated breaking strength that are not to be exceeded upon installation or during the life of the line. Actual tension on the span will vary as you travel across the span. (1,134 kg). Mar 29, 2018. and has a cross-sectional area of 0. The conductor sag should be kept to a minimum in order to reduce the conductor material required and to avoid extra pole height for sufficient clearance above ground level. Determine sag of a surface based on radius of curvature and diameter. The conducting wire weighs 12 N/m, and the tension is 1,500 N/m. please explain in detail. If the pull during measurement in not the same at which the tape is standardised then the correction for pull is necessary. Download PDF. The test data has been published in "Vari-Ten Tensioner Data Tables, Wire Sag vs. PLS CADD), the ruling span is used to calculate sag and clearances on the plan profile drawing, and it.