Temperature

o C o F

Load Distance From Source( One Way)

Meter Feet

Allowable Voltage Drop in Percent (%)

Types Of Cable Single Or MultiCore Single Core Multicore Install Method Enclosed in conduit in thermally insulating wall Enclosed in conduit on ,a wall or in trunking Install Method Clipped Direct Cable Tray Install Method Enclosed in conduit in thermally insulating wall Enclosed in conduit on ,a wall or in trunking Install Method Clipped Direct Cable Tray

Cable ( Below/Above ) Ground

Above Ground Below Ground

To Recalculate Click Clear

Error Notification If there are Errors ,Enter the Missing Data and Click Calculate

Results Here Recommended Cable Size AWG : Cross Sectional Area : mm 2 Inputed Parameter

Wire Size Calculation Method

Step 1

Get the Input Load Current

Step 2

Allocate 20% more Current Capacity For Future Expansion (Load Current * 1.2)

Step 3

Multiply the ( Temperature Current Factor ) x Load Current( Calculated at Step2)( Different Cable will have different Current Factor)

Step 4

Determine where the Cable is install (Above / Underground) , Method of Installation ( Cable Tray , Conduit) then multiply it with the specific Constant shown in the Cable Spec

Step 5

Base on ( Type of installation , Cable Type , Method of Installation), Check the Cable Spec sheet to verify which cable Size" Diameter " AWG " is able to support your Calculated Current

Step 6

Determine the Allowable Voltage Drop eg: Your Single Phase incoming power is 220 vac and the Allowable voltage drop is 3 % ,then the calculated allowable voltage drop will be 6.6 vac

Step 7

At Step 6 you have found your Cable Size for example AWG 17. go back to the cable spec sheet and check the AWG 17 ( under the Voltage Drop / AMP - meter Column)

Step 8

Multiply the ( Voltage Drop / AMP - meter Column) x Current Value ( From Step 4) x (Distance from Load)

Step 9

If the Computation result from Step 8 is more than the allowable Voltage drop calculated at Step 6, Move down the table ,continue the computation Process until you find the Final computation value which is lesser than the Allowable Voltage Drop, and that will be your final cable size

Live Example

Step 1

Step 2

Step 3

Check the Temperature Constant Table

oC Constant

Step 4

Step 5

Now You Got your Calculated Current .Base on these Condition inside the bracket( CableType ? Single Phase or Three Phase ? MultiCore or single Core ? Mounting Method ? )Search the Cable Specification Table , to check which Cable Size is able to support the calculated Current

AWG Cross Section Area mm2 Maximum Ampere

Step 6

Calculate the Allowable Voltage Drop

Step 7

Go back to the Cable and Calculate ( voltage drop per Meter X Load Distance x Calculated Current)

AWG Cross Section Area mm2 Voltage Drop per Meter Voltage Drop / m x Current x Load Distance

Step 8 & 9

Caution – For Reference only ( will not be responsible for any damage cause.)

All installation and Calculation must be check by a Certified Engineer , and Electrician

Note: Different Cables might have different Specification , you are advise to get the Cable Spec from the Manufacturer

Check out 4 to 20mA Calculator here