LV Cable Ampacity Calculator

Name (optional) Construction Single conductors Multiconductor cable, Type TC-ER Insulation ConductorCopperAluminum Size Circuit Neutral Equipment ground Mostly nonlinear load: the neutral counts and carries current, 310.15(E)(3) Laid as Triplexed or in trefoil (touching) Flat, touching Flat, spaced apart Spacing, center to centerin

Ampacity column90 °C75 °C60 °C Terminations75 °C60 °C90 °C N-M limit90 °C75 °C60 °C Load (optional)A Load factor

Installation Underground conduits and duct banks Direct buried Conduits in air Cables in free air Earth temperature°C Air temperature°C On a rooftop, less than 3/4 in. above the roof, in sun (NEC adder) In direct sun (Neher-McGrath solar heating)

NEC ambient correction Table 310.15(B)(1)(1) Equation 310.15(B)(1), exact ambient Engineering supervision: Neher-McGrath, NEC 310.14(B)

Soil thermal resistivity°C·cm/W Concrete resistivity°C·cm/W Rating Each cable at its temperature limit, all loaded at once Temperatures at the entered loads Solar radiationW/m² Load-cycle diameter D_xin