Page last updated Oct 16, 2018 @ 11:57am
Voltage Drop Calculator
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Use this calculator to estimate cable voltage drop for sizing conductors. The calculation assumes uncoated copper or aluminum conductors operating at the temperature selected and is based on the ac/dc resistance or impedance from NEC 2005 Tables 8 and 9 for stranded conductors operating on a DC or AC 60Hz system. The ampacity of each conductor size in the dropdown menu below is based on NEC 2005 Table 310.16 for 60C insulated conductors rated 0 through 2000 volts with not more than three current carrying conductors in raceway, cable or earth with an ambient of 30C (86F). Note that the actual ampacity and voltage drop for your application may differ from these results but in most cases will be very close to those shown here. Units herein are American Wire Gauge (AWG) and English (feet). Note, to run this calculator JavaScripts must be enabled on your browser. Click here for alternate calculator that also includes a transformer and motor load. NOTES:
More information about voltage drop based on IEC standards is available in the Schneider Electric Electrical Installation Guide. UPDATE: On 11/4/2009 the 3-phase %
calculation was adjusted by a factor of 1.732 |
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