For continuous loads, the branch-circuit rating, the conductors, and the overcurrent device are required to be not less than 125 percent of the rating of the equipment.
Sections 210.19(A), 215.2, and 230.42(A) require conductors to be rated at least 100% for non-continuous loads plus 125% for continuous loads. In addition, 110.14(C) requires the temperature rating of the equipment terminals to be considered when sizing conductors.
The ampacity of the power supply branch conductors and the current rating of the overcurrent protective device shall not be less than 50% in the short term or 100% in the long term, whichever is greater.
If the branch-circuit rating circuit supplies a continuous load or a combination of continuous and non-continuous loads, the overcurrent protective device rating shall not be less than the non-continuous load plus 125% of the continuous load
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