Mike Dolt Enterprises
Mike Dolt Enterprises
User: Stevenfyeager, Location: United States, Indiana
Asked on: Wednesday, April 9, 2025 at 8:20 pm EDT
Answered on: Wednesday, April 9, 2025 at 8:28 pm EDT
Question: Infratech 4000 w 240v heater has 16.7 amp rating. 16.7 X 1.25 = 20.9 amps which is too high for Cu # 12 Romex, correct ?
Yes, you are correct. Infratech 4000W, 240V heater
Rated at 16.7 amps.
NEC Requirement
Continuous loads (like heaters) require conductors to be rated for 125% of the continuous load current.
Calculation
16.7 amps 1.25 = 20.875 amps (round up to 20.9 amps)*
#12 AWG Copper Romex: Typically rated for 20 amps at 90°C, but under most circumstances, it is limited to the 60°C or 75°C ampacity, which is 20 amps.Therefore, a #12 AWG copper conductor is insufficient for the Infratech heater circuit if the heater is considered a continuous load. You would need to use #10 AWG copper. Flag for review