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The national electrical code® (nec) is the most widely adopted code in the world approved by the american national standards institute (ansi), the nec is the most complete set of electrical. Basic nec code rules and design practice wire ampacity and size 1 maximum loading for any branch circuit is 80% of rating of circuit for ampacity of. The national electrical code to confirm that safety design criteria are defined in the code the nec also has rules about how many circuits and.
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