![]() Than the sum of the continuous load plus the noncontinuous Load to be served after the application of any adjustment orĮxception: If the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operationĪt 100 percent of its rating, the allowable ampacity of theīranch-circuit conductors shall be permitted to be not less Have an allowable ampacity not less than the maximum (b) The minimum branch-circuit conductor size shall The minimum branch-circuit conductor size shall have anĪllowable ampacity not less than the noncontinuous load Or any combination of continuous and noncontinuous loads, (a) Where a branch circuit supplies continuous loads Conductors shall be sized to carry not less than the larger of Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. While there is such a thing as a 100%-rated breaker, they are typically only found in industrial work.įurthermore, the branch circuit wiring needs an 80% derate for continuous loads as well, as per 210.19(A)(1): The reason why is because garden-variety breakers made to UL 489 (and their counterparts in fuse-land) will eventually trip (or blow) if you run 100% of their rated current through them for hours on end. The sum of the continuous load plus the noncontinuous load. Overcurrent device shall be permitted to be not less than The overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.Įxception: Where the assembly, including the overcurrentĭevices protecting the branch circuit(s), is listed for operation at 100 percent of its rating, the ampere rating of the Where aīranch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of You have to consider that the breaker may have other ideas, as stated in 210.20(A): While 210.22 would seem to indicate that you have the full 30A available to you:Ģ10.22 Permissible Loads, Individual Branch Circuits.Īn individual branch circuit shall be permitted to supplyĪny load for which it is rated, but in no case shall the load Use the 80% rule for continuous loads (because the breaker will, even if you don't)
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