Can motor feed conductors be sized based on current measurements taken in the field?

Motor feed conductors need to be sized based on standardized procedures that consider the rated full-load current of the motor, ambient temperature, insulation type, and other relevant factors outlined in the National Electrical Code (NEC) or similar standards. Sizing based solely on current measurements from the field could lead to unsafe conditions; for instance, these measurements may fluctuate and not account for start-up currents or the thermal dynamics of the wire and insulation over time. Therefore, using field measurements without a comprehensive analysis can result in under-sizing or over-sizing conductors, which could ultimately jeopardize both safety and efficiency. Standard sizing methods ensure consistency and reliability in electrical installations.