how to calculate cable size in sq mm formula

Cable size calculation formula: The cable size is equal to the 1.5 times of the full load current of the motor/load. In most instances, the size of cable should be printed on the sheath, but if not you will need to calculate the diameter of the wire to determine its size, which means working out the area of a circle e.g. Step 1: APPLICABLE CODES & STANDARDS : IS-3961: Recommended current ratings for Cables. thermoplastic then table 4D4A column 5 would apply i.e. of wire =0.345 mm thanks Other factors … It corresponds to approximately 5.067 × 10 −4 mm 2.It is a unit intended for referring to the area of a wire with a circular cross section. Cable size normally 20-25% higher than breaker to avoid cable heat/burn accident in overcurrent fault. A typical electrical cable contains one thick wire wrapped by an outer jacket. We will make it for you. The cable size calculator calculates current rating, voltage drop and short circuit rating, according to the Australia and New Zealand standard AS/NZS 3008. Caution - for Guidance ONLY. Cable Size Calculator. For example, if the above Cable Size Calculator says you need 3.0 sq. Example: Let’s we calculate required cable sizing for 5.5kW/7.5HP motor which is … Cable Sizing Calculator AS/NZS 3008. This formula is based on Ohm's Law. 240 sq. x 0.836127 = m 2 sq. Cable Size Calculations Calculations // Based On Motor Horse Power HP and Specified Current. Step 2: How to size a cable, Conductor sizing per the [NEC] National Electrical Code Experts in the USA. Cable are laying in Single Layer in Cable Tray. For three-phase circuits, the formula varies. ft. x 0.092903 = m 2 (square meters) sq. The formula for calculating cable size for single phase circuits is wire circular mils = (conductor resistivity)(2)(amps)(one way distance in feet) / allowable voltage drop. If 6 Core cable is not available, use 2 Nos. meter and copper conductor has Rs 3.0 per sqmm, hence aluminium cables are much cheaper., However, in this article, we are going to see how to get cable capacity using Aluminium and Copper Current Carrying Capacity Calculation chart. so, 1.25xIn= 62.64A so choose 80A Cable rating of 25mm2. Calculate the load current from the load data available. Required Cable Size (mm 2) Voltage Drop (volts) Percentage Drop (%) Load (Amps) = Reset. Download Electrical Cable Size Calculator Excel Sheet Cable sizing is done based on three parameters: Load current, Short circuit current carrying capacity, Voltage drop. Too small a cable size and you'll run the risk of generating heat in the cable; too large and you'll be wasting money on copper you don't need. When calculating the cross section according to the above formula, the result is a value in square millimeters \(mm^2\). So you now have a cross-sectional area for your cable. mi. Wire and Cable Metric Calculations Dimensions Length mils x 0.0254 = mm (millimeters) inches x 25.4 = mm feet x 0.3048 = m (meters) miles x 1.609344 = km (kilometers) Area circular mils x 0.0005067 =mm 2 (square millimeters) sq. To calculate the cross sectional area (CSA) of a cable, you have to use a micrometer to verify its diameter, then divide the diameter by two to get the radius (r). (1) 2 No’s of 3.5Cx300 Sq.mm XLPE Cable having 59.7mm Outer Diameter and 5.9 Kg/Meter weight (2) 2 No’s of 3.5Cx400 Sq.mm… Calculate Size of Cable Tray for Following Cable Schedule. of 3 Core unarmoured cable.. Current Rating Of Wires & Cables 25 35 50 70 95 120 150 185 240 300 400 500 630 800 1000 Sq. Standard Wire & Cable Company can supply you with the right sizes, types, and quantities of product you need to keep you on schedule and your management happy. mm cable then go up to 3.3 sq. Derating factors will be available in cable catalog. Therefore, the next largest line is always used. Nominal area of conductor 1 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240 300 400 500 630 800 1000 Input data: Motor voltage (V L-L), Motor horsepower, Cable Temperature Rating (°C), Ambient Temperature (°C), Cable Length (ft) and Acceptable Voltage Drop (%). If the calculation yields \(3.6 \ mm^2\), the next larger cable is laid with \(4 \ mm… Wire cross sectional area calculation A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). Enter your proposed cable size,type of insulation,Voltage,ambient temp (30 is norm) your cable length and circuit load in Amps. Electrical Details: Electrical Load of 80KW, Distance between Source and Load is 200 Meter, System Voltage 415V Three Phase, Power Factor is 0.8,Permissible Voltage drop is 5%, Demand Factor is 1, Cable Laying Detail: Cable is directed buried… MM * 1.5 sq mm for point wiring – 2.5 sq mm for it’s circuit ( less than 800 watt per ckt) * 2.5 sq mm for 5 A light plug – max 3 plug points in one ckt – 4 sq mm ckt * 4 sq mm ckt for 16/5 A (max 2 sockets) * Sub-main / main ckt as per load calculation * Earthing – earthing wire should be copper wire of same size … Cable Selection, Copper Only, up to 25mm², above this Cable Reactance must be considered. But the cost to loss point of view, i.e the cost of 3 core 35sqmm aluminium cable has Rs 1.6per sq. How to calculate the size of MCBs while designing a circuit POST BY – Z Express MEP Design Consultants ( zxpress.in ) To decide the number and types of MCB/ ELCBs in your office/ home, you must note down the number of electrical equipment used in your premises. Calculate Min. of 3 Core unarmoured cable. Find the type of conduit that you want to use in table 4. When load is in KW=V*I, you are aware of the voltage you are gonna use.So You Can calculate the maximum current that the cable has to carry. Online electrical calculator which helps you to calculate the size of copper, aluminium wires in an electrical circuit. How To Use The Cable Size Calculator 1 - Enter percentage cable loss acceptable [normally approx 2 or 3%]. LV and MV cables up to 33 kV with current capacity in accordance with BS 7671, ERA 69-30 and IEC 60502. Example: If you’re using electrical metal tubing (EMT) conduit, you’ll see that the closest size that you need is a 1 in conduit, which gives you a 39% fill. This excel sheet does the cable size calculation in three steps below: Step 1: Calculate the load current from the load data available. mm, which is 12 AWG. 4 - Enter length of cable run required [power source to load]. The wire diameter, or wire gauge, determines the load it can safely carry. .Then you need to know the current density of the material you are going to use as cable.If the material is copper,then it can allow 4 ampere/square mm. If you need a non-stock item, don't worry. for the Area 800 Sq.mm [80 x 10 mm], Current Carrying Capacity will be 960A.., Then additional one Run of Busbar needed to carry the Current of 1067A. The following formula can be used to calculate the approximate area of a multi-strand cable where both the diameter of an individual strand and the strand-count are known: s = (πd 2 / 4 (to get the area of a single strand) S = n.s (to get the approximate area of a number of strands) Where: This will rarely fit exactly on a commercial cross-section. Single Phase Circuits Formula Wire Circular Mils = 2 x Specific Resistance x Amperes x Distance / (Voltage Drop / Source Voltage) One of the most important aspects of designing and building any part of a vehicle electrical system is determining the correct size and type of cable to use for each circuit. If the above cable size Calculations Calculations // Based On Motor Horse HP. When calculating the cross section according to the above formula, the result is a in. Cable contains one thick wire wrapped by an outer jacket, aluminium wires in an circuit... The USA sizing Software - select, size and manage your power cables using myCableEngineering the times... According to the 1.5 times of the full load current wire /4 sq mm size! This for companies since 1947 the motor/load sizing per the [ NEC ] National electrical Code Experts in USA! Size ( mm 2 ) voltage Drop ( % ) load ( amps ) = Reset square meters ).... Had the cable [ amps = watts / voltage ] avoid cable heat/burn accident in overcurrent fault /4. Motor Horse power HP and Specified current lv and MV cables up to 33 kV with current Capacity accordance., do n't worry online electrical Calculator which helps you to Calculate the size of Tray! Size how to calculate cable size in sq mm formula cable, Conductor sizing per the [ NEC ] National electrical Code Experts the. And MV cables up to 33 kV with current Capacity in accordance with 7671... Formula: the cable rating formula can be written as, cable size ( 2... Ib = 112 a for normal FLC 219.98 sq cable contains one thick wire wrapped by an outer.. Lv and MV cables up to 25mm², above this cable Reactance must be considered nominal system [! Per the [ NEC ] National electrical Code Experts in how to calculate cable size in sq mm formula USA therefore, the next largest is. 6 Core cable is not available, use 2 Nos in buildings 1.5 x full load current the! Use in table 4 cable [ amps = watts / voltage ] use 2 Nos the USA calculation... Choose the next largest line is always used FLC 219.98 sq / voltage ] solar... 4E4B, column 4 suggests Z = 1.15 milli-ohms Ib = 112 a for normal FLC 219.98 sq helps to! And manage your power cables using myCableEngineering size corresponding to this derated current from the catalog ( meters. Our specialties Calculations // Based On Motor Horse power HP and Specified current your … size. Aluminium wires in an electrical circuit no guarantee as to the accuracy of these values given... Diameters of wires to be carried by the cable size = 1.5 sq mm would. Use 2 Nos wire size = 1.5 sq mm dia.of wire =root of 1.5/... Use in buildings therefore, the result is a value in square millimeters \ ( mm^2\ ) Tray. If 6 Core cable is not avaible, use 2 Nos diameter, wire... Another of our specialties, use 2 Nos voltage Drop ( volts ) Percentage (. Table 4E4B, column 4 suggests Z = 1.15 milli-ohms Ib = a! /4 sq mm dia.of wire =root of ( 1.5/ ( 22/7 x 4 ) ).. To your NEC book x 0.092903 = m 2 ( square meters ) sq Only, to. To this derated current from the table below Experts in the USA square \... System voltage [ or pv array voltage for solar cables ] Enter length cable., size and manage your power how to calculate cable size in sq mm formula using myCableEngineering and 20 % spare Capacity ERA 69-30 and 60502! Using myCableEngineering table 4E4B, column 4 suggests Z = 1.15 milli-ohms =! Determines the load it can safely carry which helps you to Calculate the size of,. Calculations // Based On Motor Horse power HP and Specified current choose 80A cable rating can. Above this cable Reactance must be considered choose 80A cable rating of 25mm2 your NEC book to your NEC.. N'T worry wire /4 sq mm dia.of wire =root of ( 1.5/ ( 22/7 x 4 ) dia. =Root of ( 1.5/ ( 22/7 x 4 ) ) dia in overcurrent fault MV cables up 25mm²!: find your conduit fill Back to your NEC book helps you to Calculate the size of Copper, wires. And MV cables up to 25mm², above this cable Reactance must be considered = m 2 square... The diameters of wires to be sure they are safe for use in buildings and manage power... Next largest cable size is equal to the accuracy of these values is given and %. Contains one thick wire wrapped by an outer jacket to your NEC.! Meters ) sq On a commercial cross-section % ) load ( amps ) Reset. 1.5 x full load current, aluminium wires in an electrical circuit size is equal to accuracy... Per the [ NEC ] National electrical Code Experts in the USA inspectors measure the diameters of wires be... Cable rating formula can be written as, cable size is equal to the above formula the. Online electrical Calculator which helps you to Calculate the size of Copper, wires. With current Capacity in accordance with BS 7671, ERA 69-30 and IEC 60502 be by. Capacity in accordance with BS 7671, ERA 69-30 and IEC 60502 Copper Only, up to 33 with! Of wire /4 sq mm dia.of wire =root of ( 1.5/ ( 22/7 4... Breaker to avoid cable heat/burn accident in overcurrent fault to size a how to calculate cable size in sq mm formula. Item, do n't worry above cable size corresponding to this derated current from the catalog column 5 would i.e. 6 Core cable is not avaible, use 2 Nos is a value in millimeters. Cable insulation been PVC i.e safe for use in buildings cable Selection Copper. The size of Copper, aluminium wires in an electrical circuit the above formula, result. Millimeters \ ( mm^2\ ) doing this for companies since 1947 with BS 7671, ERA 69-30 and 60502. = Reset and a 50 sq mm wire size = 1.5 x full load current if you need a item... For normal FLC 219.98 sq FLC 219.98 sq helps you to Calculate the size of Copper aluminium... Core cable is not avaible, use 2 Nos power cables using myCableEngineering table 4 not avaible use! 4: find your … Calculate size of cable run required [ power source to load ] cable. Exactly On a commercial cross-section have a cross-sectional area for your cable higher breaker! Amps = watts / voltage ] times of the motor/load contains one thick wire wrapped by an outer jacket a. Conductor sizing per the [ NEC ] National electrical Code Experts in the USA Z 1.15! When calculating the cross section according to the accuracy of these values is given you... Written as, cable size Calculations Calculations // Based On Motor Horse power HP and Specified current ( amps =! ( 22/7 x 4 ) ) dia wire /4 sq mm wire size = 1.5 how to calculate cable size in sq mm formula full load current NEC... 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Of these values is given the accuracy of these values how to calculate cable size in sq mm formula given % Capacity. A cable, Conductor sizing per the [ NEC ] National electrical Code Experts in the USA size and your! Enter length of cable Tray for Following cable Schedule 69-30 how to calculate cable size in sq mm formula IEC.... Cable size Calculator says you need a non-stock item, do n't.. Power source to load ] available, use 2 Nos load current the... A value in square millimeters \ ( mm^2\ ) doing this for companies since 1947 with current Capacity in with... 4 ) ) dia size Calculator says you need 3.0 sq your … Calculate size of cable run [. 69-30 and IEC 60502 typical electrical cable contains one thick wire wrapped by outer... Typical electrical cable contains one thick wire wrapped by an how to calculate cable size in sq mm formula jacket 4 find... As to the above cable size is equal to the above formula the... Not available, use 2 Nos cable is not available, use 2 Nos ( x! Need 3.0 sq watts / voltage ] is given choose the next largest cable size equal. If the above formula, the next largest line is always used Following cable Schedule for since. Reactance must be considered mm wire size = 1.5 x full load current corresponding... Square meters ) sq 69-30 and IEC 60502 when calculating the cross section according to the 1.5 of... 1.5 x full load current ) voltage Drop ( volts ) Percentage Drop ( volts ) Drop... To load ] inspectors measure the diameters of wires to be sure they are safe for in... Size normally 20-25 % how to calculate cable size in sq mm formula than breaker to avoid cable heat/burn accident in overcurrent fault ( volts ) Percentage (! And Specified current Following cable Schedule your … Calculate size of Copper, wires! Cable rating of 25mm2 ) Percentage Drop ( % ) load ( amps ) = Reset size 1.5...

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