Christofides electrical many thanks for the excellent program and the customer service. Pdf effective cable sizing model for building electrical. Impedance and voltage drop to iec 60909 and cenelec clctr 50480. Singlecable, from amtech, calculates individual electrical circuits quickly and easily in accordance with bs7671 iee wiring regulations. Etap enterprise suite provides one solution to your power. For the remainder it shares a cable tray, touching two similar cables across the top of a boiler room the ambient temperature is 50 degrees c. If current rating in buildings is required reference should be made to bs7671 iet wiring regs. Because of rapid advances in the medical sciences, in particular, independent verification of. We have a fully fledged application where you can size lv and mv cables up to 33 kv, current capacity in accordance with bs 7671, era 6930 and iec 60502 and with clear easy to read calculations and reports. Singlecable pro quick single cable calculations to bs 7671 high voltage for high voltage work please see our designer suite range which includes a range of software in one pack including fault level analysis software, hv coordination studies software and more. Thermal insulation, c i where a cable is in contact with thermal insulation on one side only, the currentcarrying capacity of the cable should be calculated using reference method 4, which is described in appendix 4 table 4a of bs 7671. Bs 7671, iee wiring regulations voltage drop is calculated and cable size increased if necessary 3. It is the intention of this article to explain simply how to select the correct crosssectional area of cables with particular singlephase loads in mind. Singlecable is a cable calculation software that is extremely simple to use and provides results in seconds, whether the cable is a submain feeder or final circuit.
Input the power in watts or current in amperes which you require your cable to carry 4. Design and verification of electrical installations. Click to download our catalogue pdf for single core low voltage cable. Cable size cable length device rating volt drop % single run 2x parallel. The 18th and latest edition of bs 7671 the iet wiring regulations published on the 2nd july 2018. Select an appropriate bs88 fuse rating and suggest the size of cable that my be appropriate.
This post gives some insight into how the tool works, the calculations carried out and how to use it. Iet wiring regulations bs 7671 18th edition rs components. This cable calculator is set for installation method c clipped direct, for cable types bs5467 and bs6724 swa steel wire armoured cable and is based on the voltage drop selected at 230v single phase and 400v three phase. Technical topic student minimising voltage differences short. Prodesign features electrical design software trimble. The cable specification programme starts with the selection of the desired cable from a dropdown box, the desired phase of the supply, whether it is single or multicore and if the cable is to be buried. Amtech 2015 quick guide 12 prodesign general the most significant change in bs 7671. Cablecalc bs7671 will calculate and check for voltage drop, disconnection. Guide to the wiring regulations landlord certificates.
It enables the competent electrician to deal with installations up to 100 a, 3phase providing essential information in a convenient, easytouse format. Short guide to the 17th edition of the wiring regulations. Amendment 1 to the 18th edition will be a free download on the iet website. Impact of the changes in the 18th edition iet wiring. Example of voltage drop calculation and cable selection pdf. Quick single cable calculations to bs 7671 whatever type of circuit, whether a mains feeder or a final circuit, you can size the cable accurately in seconds and produce detailed reports. Reference method exampleofinstallationmethod relevanttablefrom bs7671.
Cable pro web bs by electrotechnik cable sizing and. Model forms bs 7671 home of the wiring regulations. Pdf an effective cable sizing procedure model for industries and. Also available in a low smoke halogen free version. Section 703 rooms and cabins containing sauna heaters. Electrical design, cable sizing and certification software. The guidance in the approved documents refers to bs 7671 as being one way to achieve compliance. Amtech single cable calculator screwfix community forum. For more information about singlecable, you can request a demo or view features. Pro certs electrical testing software to produce professional electrical certificates. Multiply by the actual current in the cable not the current rating 3. The basic philosophy underlying any cable sizing calculations are the same.
Cable sizing software cable sizing calculation etap. Reference method f in free air or on a perforated cable tray horizontal or vertical touching spaced by one diameter 3 or 4 cables, three phase a. The user is to ensure the type of cable is suited to environment and conditions the cable will be exposed to. The two basic calculations that determine the size of a cable to be used for a particular purpose are. Cable types and installation methods the standard circuit tables have assumed flat twin and earth cable to bs 6400 with reduced cpc size and installed as table 4a2 of bs 7671 with current rating.
The voltage drop for a run of cable s is calculated using the following formula. Harness the power of your mobile device with a smart electrical app. Jan 15, 2016 guide to the wiring regulations 17th edition iee wiring regulations bs 7671. In this article, sean passant, atlas council member and technical manager at dehn uk ltd assesses the impact of this new edition on the lightning protection and surge protection industry. Calculate any cable in seconds helps ensure you comply with current standards instant on screen results contains full database of cables and protective devices. The length of the run from the fuse is 20m and for half this run, the cable is to be clipped to wall surfaces. Automatic voltage drop correction increases the size of the conductor ensuring that it meets. The 18th edition amendment 1 will be known as bs 7671. The tabulated voltage drop values are for a current of one ampere for a one metre run along the route taken by the cables.
Elculator is an innovative online software where is used for cable design and calculation according to the 17th edition of the wiring regulations bs7671 3rd amendment, it can output schematic and detailed reports. The recommended cable sizes are based upon information provided by the user and are intended as a guide only. Cable and installation reference method selection is quick and simple ensuring that the correct currentcarrying capacity data is used. This can be accessed around the clock by registering free at identifying the precise cable specification takes a matter of seconds using this online calculator, which is based upon bs 7671. Amendment 1 of the 18th edition is due to be released in early 2020. The version in force when the law came into effect was the 16th edition, bs 7671. Includes the application of the requirements of the 17th edition of the iet wiring regulations, as amended bs 7671. Machinery as defined in the regulations is outside the scope of bs 7671, and bs 7671 accordingly points to bs en 602041. Earth fault loop impedance zs 100% or 80% values on site with matt. I have amtech but its only the basic single cable version which wont size three phase or anything 100amp this wouldnt be for designing, more a quick reference when carrying out pirs and probably just for swas id like to be able to enter the following. Reference method f in free air or on a perforated cable tray etc horizontal or vertical etc.
Cable sizing methods do differ across international standards e. During the electrical design electricalom acts interactively and indicates to the user useful. Cable tray should be perforated and 20% spare capacity. Calculate correct cable size for a new single circuit as done in appendix 4 of bs 7671. Oct 20, 2009 the amtech package will apply the criteria in bs 7671 such that each leg of the ring can carry 20a for the installed conditions. This course employs a cable sizing template that acts as a visual checklist for the necessary design decisions and calculations to meet the requirements of bs 7671. For a single cable likely to be totally surrounded by thermally insulating material over a length of more than 0. The software can be configured to automatically suggest an appropriate conductor size or check the suitability of a manually selected conductor. All levels of cablecalc bs7671 will perform both single and threephase calculations. The next major update to the 18th edition is expected to be released in 2022.
The electricalom undoubtedly is the best electrical design and calculations software in the industry made for bs 7671 charalambos flouri, beng eee, msc, mba, miet s. Pvc selfextinguishing and flame retardant according to en 6033212. However the general principles underlying any cable sizing calculation do not change. Singlecable single circuit calculations software demo amtech. Prodesigns many design options provide total control from initial design through commissioning, right up to final completion. Blank model forms for certification and reporting, suitable for printing out and filling in by hand, are available in pdf format to download. Cable size auto, custom, voltage drop dc, 1ph, 2ph, 3ph, fault loop. The basic philosophy underlying any cable sizing calculation is to develop a procedure model on cable sizing. Prodesign now links to autodesk revit mep 20 cable schedules view demo here fast, accurate design calculations to bs 7671. Cable short circuit capacity should be higher than system short circuit capacity at that point. Again, manual calculations can be tedious, and the graphs in figures c 4. Cable calculations part 1 bs7671 18th edition online course. Etap cable sizing software suite offers powerful features to save time and improve accuracy for cable calculation and electrical design.
Ill refer to the tables in appendix 4 of bs 7671, although these tables are reproduced in appendix 6 of the iee on site guide. The required cable size is the largest size from shortcircuit, overload, and shock requirements. Appropriate correction factors are chosen based upon the installation parameters specified on the installation tab. Once calculated, the program also enables you to look at the results for the next cable size larger or smaller, and the same facility is available for the protective device. Single phase ac volt drop if the cable spacing is larger than 1 cable diameter then the volt drop will be larger than those specified.
Apr 01, 2009 this special location now includes basins of fountains. Works through a cable calculation in stages, as laid out in appendix 4 of bs 7671. Draka, already mentioned, is one company that has provided a cable sizing calculator on its website. Our cable sizing tool is one of the more popular tools on the site. Cable sizing for safety and in accordance with the 17th. Oct 04, 20 cable and installation reference method selection is quick and simple ensuring that the correct currentcarrying capacity data is used. Fast estimating method of effective life of power cable in industrial environment. Kindly complete the part numbers for these cables by adding the suffix in place of xx for the colour required. The main objective of this research work is to develop effective cable.
Manual calculations are still extensively used and in particular are necessary for checking and verifying various software calculation design packages. This powerful, engineerfriendly software is ideal for projects of all sizes, from houses to office blocks. Cable sizing and maximum demand software very easy to use accurate and compliant cloudbased use on any device. This cable calculator is running in demonstration mode and certain features have been disabled.
Prodesign is packed full of powerful features to save time and improve accuracy. Electrical cable size calculator melissa electricals. Along with the cable sizing calculation results, this section also displays the required cable sized, cable ampacity, percent of voltage drop, and percent of starting voltage if cable sizing options for the corresponding requirements are checked. Cablecalc level 1 will calculate single and three phase calculations for radial and ring main circuits with the results output to a detailed calculation printout. If you are used to designing larger buildings then you will perhaps have noticed that the calculations are often based on the assumption that all the load appears at the. Application runs through a cable input the data so you have already carried out the cable sizing.
Choose your supply type single phase 230v three phase 400v 2. Prodesign calculates the required cable or busbar current carrying capacity for each circuit in the design using the procedures described in bs 7671 appendix 4. The following cables are to be installed in a single run of trunking. Cable sizing, sustained current capacity bs 7671 wiring regulations, voltage drop clctr 50480, fault level and impedance iec 60909. Single core low voltage power cable cse distributors. Motor starter type direct online, stardelta, softstart etc. Divide the result by one thousand to convert millivolts to volts. The tool enables cables to be sized in compliance with bs 7671 the iee wiring regulations and by implication iec 60364. Elculator designed to be fast and accurate based on bs 7671. For the electrician or engineer who requires quick calculations to the requirements of bs7671. W ith mobile technology improving at lightning speeds harness the power of your mobile device, look up a max zs value in an instant, carry out a quick cable size calculation or a prospective fault current conversion or even complete your electrical test certificates with the convenience of having all the information you need. It is the essential, quick reference guide to bs 7671 and will be updated to incorporate the changes expected in amendment no. Guidance from electrical safety first intended for electrically competent persons.
Wiring regulations bs 7671 electrical safety first. Calculation of the crosssectional areas of circuit live conductors the first stage in designing an installation after having carried out the assessment of general characteristics demanded in part 3 of bs 7671 is the choice of the type of cable and the method of installation of that cable for each circuit. Cable energy withstand based on the protective devices letthrough energy. Electrical cable calculator free software download. An excellent app, that is a must have for any electrical installation engineer. The calculator then moves on to installation method and cable grouping, before requiring boxes to be filled in with the remaining cable. Cuxlpepvcawapvc power cable may be used for fixed installation indoors and outdoors in cable ducts or directly in the ground. The cable sizing template can be used as a standalone design sheet, or it can be used to inform the process, enabling a more cost effective use of commercial cable sizing. How to calculate voltage drop recon electrical ltd. C or dg body earthing neutral earthing dec 07, 2014 calculate size of cable tray for following cable schedule. Max demand diversity cable calculator, 3 phase power calculator, volt drop. You may want to check out more software, such as amtech prodesign, amtech fasttest 2008 sp2 patch 1 or amtech protect, which might be related to amtech singlecable. Create detailed design schedules which can be easily printed on to paper.
Just a point of interest if you are using twin and earth cable and your cable comes into contact with insulation as per any of the reference methods 100, 101, 102 or 103 then just use the table 4d5 and ci 1 in any calculations. Electrician apps smart electrical apps for the smart. Cable voltage drop should be less than defined voltage drop. It makes single cable calculations based on the bs 7671 compliance. It is highly recommended that users of such software familiarise themselves with the rudiments of these calculations. Theme manager gives the ability to quickly determine system.
Once installed on your site, certain optional features which can be turned on or off depending on your requirements. Current capacity to bs 7671, era 6930 and iec 60502. The onsite guide is an essential guide for quick reference of information on bs 7671 the iet wiring regulations the national standard to which all domestic and industrial wiring must conform. Below these links you will find our cable calculator. Iec, nec, bs, etc and some standards emphasise certain things over others. An example how to calculate voltage drop and size of.
Calculation of the crosssectional areas of circuit live. The guide has been revised to align with the 17th edition amendment no 1. Appendix 4 of bs 7671 institution of engineering and. L is the length of the run of the cables, in metres. Cable sizing calculations for phase, neutral and earthing conductors are based on the following criteria.