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The purpose of this calculator is to determine the ampacity of conductors in conduit, cable, or directly buried. All calculations are based on the National Electrical Code®.
*Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F). **Refer to 240.4(D) for conductor overcurrent protection limitations.
Twelve 12 AWG THWN-2 copper conductors are installed in a one-inch electrical metallic tubing, Type EMT in an ambient temperature of 32°C. These twelve conductors are comprised of three 4-wire multiwire branch circuits.
1 The load current rating and the overcurrent protection for conductor types shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG aluminum and …
This wire ampacity calculator will determine the maximum allowable ampacity for a given wire size based on conductor and insulation.
The insulation is a high quality, heat and moisture resistant polyvinyl chloride compound over which a heat and light stabilized nylon jacket is tightly applied.
Southwire Type THHN or THWN-2* or MTW copper conductors are annealed (soft) copper, insulated with a tough heat and moisture resistant polyvinyl chloride (PVC), over which a nylon (polyamide) or UL-listed equal jacket is applied.
The wire is covered with a tough heat and moisture resistant PVC insulation with an overall nylon jacket utilizing SIMpull® Technology. Available in black, white, red, blue, purple, green, yellow, orange, brown, and gray.
Calculate the maximum allowable wire ampacity for an insulated conductor given its gauge, material, temperature rating, ambient temperature, and conductor count.
ALLOWABLE AMPACITIES OF INSULATED COPPER 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 …
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