Electrical Exam Term
Conduit Fill
The percentage of a conduit's cross-sectional area that can be occupied by conductors, as specified by the NEC.
Detailed Explanation
NEC Chapter 9, Table 1 limits conduit fill to: 53% for one conductor, 31% for two conductors, and 40% for three or more conductors. These limits prevent conductor overheating due to restricted heat dissipation. Annex C of the NEC provides pre-calculated tables showing the maximum number of conductors allowed in each conduit size and type.
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Practice QuestionEasy
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