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Download Cable Tray and Conduit Sizing Excel Sheet - Free calculator for electrical design engineers to determine the size of cable tray and the wire conduits. Need to know how thick a cable needs to be for a solar panel, fridge, battery, or motor? How To Use The Cable Size Calculator 1 - Enter percentage cable loss acceptable [normally approx 2 or 3%]. Cable Size Calculation Spreadsheet. Cable Calculator Excel; Cable Sizing Excel Freeware. Full technical support available. 7) Once the calculate button has been selected, the program will take you to the output page, where the tray size needed will be displayed, as well as the article of the NEC that it falls under. Cable Size Calculations Calculations // Based On Motor Horse Power HP and Specified Current. Calculated Values: Operating Current (A), 125% Current per NEC (A), “Zero Length” Cable Size, Acceptable Voltage Drop (V), … 3 - Enter max amps to be carried by the cable [amps = watts / voltage]. 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