Mike Dolt Enterprises
Mike Dolt Enterprises
User: Randyel1, Location: Mississippi Gulf Coast
Asked on: Monday, February 3, 2025 at 6:12 pm EST
Answered on: Thursday, March 6, 2025 at 8:11 am EST
Question: According to the NEC 2023 code book, can I use copper #4 (4-3WG) to a 125 amp panel if my load doesn't exceed 90 AMPS?
According to NEC 2023 Table 310.16, a #4 AWG copper conductor with a 75°C insulation rating is rated for 85 amps.While your load doesn't exceed 90 amps, the #4 copper conductor is only rated for 85 amps at 75°C. Therefore, you cannot use #4 copper for a 125 amp panel even if your load is below 90 amps. Flag for review