Cable Ampacity Calculator

Wire Ampacity Calculator–Content

• AmpCalc for Windows is a computer program from CalcWare which calculates power cable ampacity ratings and/or cable operating temperatures for user defined cable installations. Ampacities are calculated for single or multiple underground systems including:.
• Direct buried cable. Direct Buried conduit. Version 4.0 now includes calculations for aerial systems including:. Cables isolated in air. Conduit isolated in air. Cables in covered or uncovered cable tray.
• Calculations are in accordance with the industry accepted Neher-McGrath calculation procedures. AmpCalc is suitable for cable installations utilized in industrial, commercial and utility electrical power distribution systems.
CopperAluminum
Wire Gauge Size60°C (140°F)
NM-B, UF-B
75°C (167°F)
THW, THWN,
SE, USE, XHHW
90°C (194°F)
THWN-2, THHN,
XHHW-2, USE-2
75°C (167°F)
THW, THWN,
SE, USE, XHHW
90°C (194°F)
XHHW-2, THHN,
THWN-2
14152025------
122025302025
103035403035
84050554045
65565755055
47085956575
3851001157585
29511513090100
1---130145100115
1/0---150170120135
2/0---175195135150
3/0---200225155175
4/0---230260180205
250---255290205230
300---285320230260
350---310350250280
500---380430310350
600---420475340385
750---475535385435
1000---545615445500

The software is suitable for use with Windows 7, 8.1 or 10. Licenses for single computer, multiple computer and network applications are available. Refer to a partial experience list for some of the companies which utilize AmpCalc.

The Advanced Wire Ampacity Calculator will calculate the maximum ampacity for a wire based on wire gauge, preferred (or available) wire insulation, conductor type and installation specifications. This calculator also provides wire size correction factors for temperature, number of conductors in a raceway, and voltage drop for long wire runs.

This calculator is based on NEC (NFPA 70®: National Electrical Code® (NEC®), 2014 Edition) Table 310.15(B)(16-17).