Conduit Size and Fill Calculator - Electrical Guy. This calculator helps you determine the maximum conduit size required for a given number of conductors. Enter the values below and click "Calculate" to see the max conduit size as per the Canadian Electrical Code (2021 CEC), CSA C22.1:21.. NEC Table 370-16 Electrical Box Fill. NEC Table 370-16(a) for Metal Boxes: Number of Conductors in Outlet, Device, and Junction Boxes. Box Dimension in Inches Trade Size or Type. Minimum. CE and Canadian Electrical Code CSA C22.1 are registered trade marks of the Canadian Standards Association (CSA)

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Here's the code: 12-3034 Maximum number of conductors in a box. (2) Except as specified in Subrule (3) and subject to the details given in Subrule (1), boxes of the nominal dimensions given in Table 23 shall not contain more insulated conductors of a given size than permitted by the Table, and the number of conductors shall be reduced for each.. Calculate Your Conduit Fill Percentage. A great tool to help electricians, engineers and contractors answer the question, "What size conduit do I use per the NEC®?" The app will calculate the conduit fill percentages and jam probability for multiple conductors per NEC® Guidelines. Simply enter the conduit type and size, then specify your.