NEC Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60 °C Through 90 °C (140 °F Through 194 °F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30 °C (86 °F).* *Reference to 240.4(D ...

Southwire Armorlite® Type MC Cable is constructed with soft-drawn copper, Type THHN/THWN conductors rated 90°C dry available in sizes 14 AWG through 2 AWG, and a green insulated grounding conductor.

Simplify complex wire ampacity calculations with Cerrowire’s convenient Online Ampacity Calculator. This intuitive calculator takes the guesswork out of electrical code compliance, ensuring you select the right conductor size for your specific application.

Mar 7, 2023 · So reading around the general consensus is that the conductors in MC cable are THHN and are rated at 90 degrees. Terminations are usually rated 75 degrees so it limits Max cable to that ampacity. NEC 330.80 refers you to 310.60or 310.15 for ampacity.

(5) An adjustment factor of 60 percent shall be applied to Type AC cable or Type MC cable under the following conditions: The cables do not have an overall outer jacket. The number of current carrying conductors exceeds 20.

Under normal conditions four conductor ampacities are not derated as shown above. If NEC Section 310.15 (b) (4) (a) does not consider the neutral as current carrying conductor, use ampacities listed for the three conductor cable.

**Ampacities are based on NEC Table 310.15(B)(16), and show the allowable Ampacities of three current carrying insulated conductors, in a raceway, cable, or earth based on ambeient temperature of 30°C (86°F).

Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Current is measured in amperes or “amps.”

This app uses the calculation requirements found in the 2017 National Electrical Code® to determine the ampacity of insulated conductors and certain cable-type wiring methods. This calculator also complies with the 2020 NEC requirements.

90°C for ampacity derating purposes. When the neutral is considered current-carrying conductor, the ampacity of 4/C cables shall be reduced by a factor of 0.80 per NEC 310.15(B)(2)(a). The above data is approximate and subject to normal manufacturing tolerances. Type MC-Copper Conductor-Aluminum Armor/THHN/THWN-2 Inners 600V