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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.
National Electrical Code Allowable Ampacities of Insulated Conductors Rated 0-2000 Volts. As Excerpted from the 2002 National Electrical Code. Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable or Earth. Based on Ampbient 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.”. You must use the correct size wire for the current (load) requirement of the circuit to prevent the wire from overheating.
The wire size chart below shows 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 air temperature of 30°C (86°F). Search Amazon for your Electrical ...
Conductor Ampacity Based on the 2017 National Electrical Code ®. Single-Phase Dwelling Services and Feeders. NEC 210.19 Conductors–Minimum Ampacity and Size. Correction and Adjustment Factors—See NEC Tables 310.15 (B) (2) (a) and 310.15 (B) (3) (a) NEC Information of Note.
The highest current that can be handled by the conductor is known as ampacity. The current measuring unit is the ampere. So use accurate wire for the current requirements of the circuit to prevent the wire from overheating.
Determine the allowable ampacities of insulated copper conductors, single insulated copper conductors, and more from the National Electrical Code® Allowable Copper Conductor Ampacities tables.
NEC TABLE 310.15(B)(16)- ALLOWABLE AMPACITY FOR 600V CONDUCTORS. Per NEC 310.15(B)(5), the ampacity of 4/C cables shall be reduced by a factor of 0.80 when the neutral is considered a current-carrying conductor.
Southwire® SIMpull THHN® copper conductors are primarily used in conduit and cable trays for services, feeders and branch circuits in commercial or industrial applications as specified in the National Electrical Code. Voltage for all applications is 600 volts.
When used as Type MTW, conductor is suitable for use in wet locations or when exposed to oil or coolant at temperatures not to exceed 60°C or dry locations at temperatures not to exceed 90°C (with ampacity limited to that for 75°C conductor temperature per NFPA 79)