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Wire Derating Chart

Wire Derating Chart - Enter the values below and click “calculate” to see the derated ampacity. See elliott electric supply for wholesale prices on wire, raceways, conduit. For more information, please refer to nec 2014 section 310.15 ampacities out of the cable at a slower. Table 310.16 in the 2020 nec provides conductor ampacities for the wiring we use every day when conditions of use do not force us to deviate from those numbers. For these installations, if cables are bundled for a continuous length longer than 24 in., the allowable ampacity of each conductor must be reduced as shown in table 310.15 (b) (3) (a). **refer to 240.4(d) for conductor overcurrent protection limitations. This calculator helps you derate your cable to properly determine the wire size needed for a given ampacity (mca). Wire and cable ampacity ratings spacing, derating may be required. For ambient temperatures other than 30°c, multiply the allowable ampacities. An engineer gave me this chart for derating and the sizing of conductors feeding equipment in a machine room.

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