Nec ampacity calculator is a smallsized software utility that enables users to access the most frequently used ampacity tables found in the american and canadian electrical codes, input data and. Ctc current and temperature calculation of overhead conductors is permanently enhanced since 1998 and presently available in version 6. Use of computer programs for calculation of underground cable ampacity software programs usually use neher mcgrath method for the calculation of the cable ampacity. Underground cable ampacity android apps on sep 08, 2014 the underground ampacity calculator is based on the 2012 edition of the canadian electric code and is used to calculate the maximum ampacity of underground cable ampacity calculation software etap. Wire size choose the size awg or kcmil of the wire for which to calculate the maximum allowable ampacity based on the conditions chosen above in the calculator phases select the number of phases in the circuit. Cable ampacity calculator electrical engineering portal.
It is accomplished by means of strand and insulation shields. Engineering data for copper and aluminum conductor electrical cables 102 hilltop road, ramsey, nj 07446 201. Cable sizing software cable sizing calculation etap. Ampacity calculation results cable ampacities can be calculated based on specified temperature or temperatures can be calculated based on specified load amps. This cable calculator is running in demonstration mode and certain features have been disabled. The reactance for single core cables is selected from the flat, touching column in from table 30 in asnzs 3008. Engineering data for copper and aluminum conductor. Gridcablemax is a user friendly program that determines cable ratings with total accuracy. Singlephase voltages are usually 115v or 120v, while threephase voltages are typically 208v, 230v or 480v. Duct bank ampacity calculation using ampcalc or etap or similar software is the best way to get a good handle on what the resulting duct and cable temperatures will be.
Etap electrical engineering software offers a comprehensive set of cable current carrying capacity ampacity and sizing modules based on the following standards and guidelines. Cable ampacity power system software and arc flash. Ampacity is defined as the maximum current carrying capacity of any cable. The two solution methods can be utilized within the same system for the same calculation. Overview downloads buy now try now freeware upgrades contact us. The wire ampacity calculator will quickly calculate the maximum allowable current through a conductor based on wire size awg or kcmil, wire insulation, conductor type and installation method.
Cable sizing, sustained current capacity bs 7671 wiring regulations, voltage drop clctr 50480, fault level and impedance iec 60909. Click on the screenshot thumbnails for larger image and more info about each electrical calculator. Comparison of finite element analysis to iec60287 for. Hello could somebody help me and give me a tip where can i download for free commercial usage some tool for calculation of cable ampacity according to iec 60 287 not for us standard. Normally the iec 60287 standard is used for steady state ampacity calculation.
Calculation tools for low voltage electrical network. Cable ampacity software cable sizing software cable. For the love of physics walter lewin may 16, 2011 duration. The software is suitable for use with windows 7, 8. Electrical calculation software lighting calculation software for electrical engineers, consultants and contractors. Cable sizing and its effect on thermal and ampacity values. Cable sizing and its effect on thermal and ampacity values in underground power distribution over the past decade, underground power distribution has become increasingly popular due to its reliability, safety, aesthetic characteristics, as well as the ever increasing focus on the environmental impacts of the various stages of. General calculations excerpt from prysmians wire and. Cable ampacity calculation and analysis for power flow optimization abstract. As a cable ampacity analysis application, etap engineering software determines the cable current capability based on ieee, iec, icea, nec nfpa, bs, and nfc standards. Electrical calculation tools is a set of 7 computer aided online tools designed to help you.
They may be edited onscreen to accommodate nonstandard features. Ampacities the ampacity is the maximum designed current of a conductor. Cablesizer cable sizing calculations to iec and nec. Once installed on your site, certain optional features which can be turned. Ampcalc is suitable for cable installations utilized in industrial, commercial and utility electrical power distribution systems. House and tuttle 1958 derive the ampacity calculations described below, which are used in ieee std. This characteristic parameter depends on many of the.
Electrical engineers use powertools to perform harmonic analysis, transient stability analysis, short circuit analysis, and to determine demand load, voltage drop, arcflash hazard analysis and protective device coordination. We use etaps stateoftheart cable thermal software module and accurately determine the ampacity and thermal limitations of different underground raceways and duct banks. General cables ampacity calculator is a quick and easy tool to get conductor ampacities for different temperature ratings. Calculation of the cable ampacity considers only power cables since control cables. To properly design a cable system and optimize cable configuration, calculating the ampacity value of various cables with differ. Display the timecurrent curves of 1 to 8 circuitbreakers. It takes less space on screen than would the paper version on your desk. Electrical calculation tools schneider electric global. A underground duct bank cable ampacity and thermal calculation study will determine if your duct bank design will support the loads and not cause conductor over heating. You must first generate results for at least one of the calculations i.
Iec 60502 cable capacity calculations for power cables per iec 60502. Calculations are in accordance with the industry accepted nehermcgrath calculation procedures. Usamp prime insulated cable ampacity software models all types of underground power cables pipetype, extruded, and solid paper. General cable conductor ampacity calculator for ios free.
For systems with all identical cables, a single ampacity can be calculated applicable to all conductors in the system. The standard employs the concept of thermal equivalent circuit. It is designed for contractors, electricians, and other electrical. This current carrying capacity is normally given in amperes. For a quick approximation of the derated ampacity add this calculated thermal ohm feet value to the rca value used in the nm original calculation and recalculate the ampacity.
Voltage enter the voltage at the source of the circuit. This paper presents a study of the factors that determine cable ampacity adjustments and corrections in the electrical distribution network. It is designed to estimate the steady state and transient state of overhead conductor current and temperature according to the calculation methods of cigre, webs, kirn. Okonite 1 printed on post consumer paper 12017 okonite cables. The reactance for multicore core cables is selected from the circular conductors column in from table 30 in. The accuracy of the software provides increased confidence when upgrading power cable installations and designing new ones. They consider only temperature limited, current carrying capacity of cables. The software examines cable temperature and ampacity in performing analysis of existing systems. An alternative to the standard is the finite element. Calculate conductor ampacity with temperature correction. In addition, new forced convection heat transfer analytical methods were employed for cables in air, which provided for1ess conservative ampacity ratings. Cable ampacity software additional modules offer extended capabilities to software, allowing modeling more installations, particularly nonstandard installations. Understanding the nehermcgrath calculation and the. Finding the original rca value is easier than it looks.
Shielding of an electric power cable is the practice of confining the dielectric field of the cable to the insulation of the conductor or conductors. Functions of shielding a strand shield is employed to preclude excessive voltage stress on voids between conductor and insulation. Look up the right values and apply correction factors quickly. Protective device overload cable sizing software computes the size of the cable by also considering overload protection. Ampacity level taking into account the installation method of the cable, the software determines the cable size for the installed ampacity. The standard is applicable to all alternating current voltages and direct current cables up to 5kv. Configuration optimization of cables in ductbank based on. This characteristic parameter depends on many of the cable properties, installation conditions and. Cable ampacity calculation and analysis for power flow. Ampacity calculation it is known that a cables ampacity is based on the highest allowable temperature that cable can hold without overheating, and it is influenced by the mutual heating effect of nearby cables.
Cable sizing software computes the size of the cable by also considering overload protection. Skm software help desk knowledge base cable ampacity. Abstractthe ampacity of underground power cable lines is limited by the maximal allowable temperature of the conductor. The cymcap software is dedicated to the calculation of ampacity and temperature rise calculations for power cable installations. Appendix b in the nec assumes the same wire size in each conduit and each wire has the same amp loading. Etap cable sizing program calculates the minimum size required by meeting the overload protection conditions between derated ampacity, operating current and nominal current. The calculation determines the proper cable sizes to carry specified loads in designing new systems and upgrading power cable installations. It is executed based on factors that include the soil thermal resistivity and temperature along with the grouping of the circuits. This is digital version of the most frequently used ampacity tables that you would find in electrical codes canadas cec and u. Our software has been designed to calculate the current rating, temperature rise and cable losses of high voltage power cables under multiple scenarios and installation conditions in accordance with iec standard 60287.
Pdf cable ampacity calculation and analysis for power. Ampacity audits an ampacity audit is intended to carefully determine the actual ampacity of an existing cable system. An audit begins with evaluating the utilitys load shape, the circuit plan and profile drawings, manufacturers cable data, any soil thermal analyses, etc. Cyme power engineering software low voltage cable sizing. Cymcap cable ampacity software power cable ampacity rating simgrid markets cymcap software and provides technical support as well as trainings. Thursday, july, 2017 cable ampacity constants pvc conduit cable ampacity triplexed cables monday, january 23, 2017 cable ampacity triplex triplexed cables detail 7 detail 8.
Iec 60287 calculation of the continuous current rating of cables 100% load factor is the international standard which defines the procedures and equations to be used in determining the current carry capacity of cable. This includes the modeling of ductbanks, backfills or soil layers with different thermal resistivities each. Enter the information below to calculate the maximum allowable ampacity for currentcarrying conductors. The accuracy of the software provides increased confidence when upgrading power cable. A given conductor has several ampacities, depending on its application and the assumptions used. The accuracy of the calculation provides increased confidence in the design, upgrading, and analysis projects. Then the program retrieves the standard dimensional features and calculation constants for the cable and displays them. The tables in this standard reflect these changes in methodology and provide the user with a vast array of cable ampacity ratings for 600 v utilization cables, medium voltage distribution.
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