Not exactly.

For branch circuits

For feeders:210.20 Overcurrent Protection.

(A) Continuous and Noncontinuous Loads. Where a branch

circuit supplies continuous loads or any combination of continuous

and noncontinuous loads, the rating of the overcurrent

device shall not be less than the noncontinuous load plus

125 percent of the continuous load.

Exception: Where the assembly, including the overcurrent devices

protecting the branch circuit(s), is listed for operation at 100 percent of

its rating, the ampere rating of the overcurrent device shall be permitted

to be not less than the sum of the continuous load plus the noncontinuous

load.

Note this is the minimum size because of the phrase215.3 Overcurrent Protection. Feeders shall be protected

against overcurrent in accordance with the provisions of Part I

of Article 240. Where a feeder supplies continuous loads or any

combination of continuous and noncontinuous loads, the

rating of the overcurrent device shall not be less than the

noncontinuous load plus 125 percent of the continuous load.

Exception No. 1: Where the assembly, including the overcurrent devices

protecting the feeder(s), is listed for operation at 100 percent of its

rating, the ampere rating of the overcurrent device shall be permitted to

be not less than the sum of the continuous load plus the noncontinuous

load.shall not be less.

basically if you use a 100% rated breaker you can go to 100% FLC.

If you do not use a 100% rated breaker it is 100% of the noncontinuous load plus 125% of the continuous load.

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