NEC · 2020 National Electrical Code
§430.6 · Ampacity
Effective in NEC 2020 · NEC 2023 NW Indiana.
Plain-English explainer
430.6 (ampacity): motor conductor ampacity is taken from Table 430.250 for single-phase and Table 430.250 for three-phase motors, with the branch-circuit overcurrent device sized per 430.52 and the feeder conductor sized per 430.24.
Why inspectors flag this
A motor circuit sized at the table value without the 430.52 overcurrent adjustment is the canonical 430.6 failure; the drafter lifts the rule so the conductor and OCP size match the motor table.
As quoted in the code: Motor conductor ampacity is taken from Table 430.250 for single-phase and Table 430.250 for three-phase motors, with the branch-circuit overcurrent device sized per 430.52 and the feeder conductor sized per 430.24.
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