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. 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