Nec Conduit Fill Chart
Nec Conduit Fill Chart. The NEC sets standards for the percent of volume that can safely be put into conduit. Each row going across is a different size and type of conduit, either EMT, IMC, or galvanized pipe (rigid metal conduit, RMC).
Use it to determine how many wires your conduit tubing can safely contain. These percentage guidelines reduce the likelihood of trapping heat and jamming wires and cables during withdrawal. It merely says the number and size of conductors can't be more than will permit heat dissipation and the ready withdrawal of conductors without damaging them..
The wire gauge can be found via the vertical column.
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To find out how many cables you can run in a given conduit size, enter your Belden cable part number, or enter the diameter of your cable. The NEC allows certain fill percentages for one, two or more wires. The horizontal numbers at the top of the graph refer to the size and type of conduit.
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