378-Nonmetallic Wireways
limitations would exceed those for which the nonmetallic wireway is listed
I. General
378.21 Size of Conductors. No conductor larger than that for which the nonmetallic wireway is designed shall be installed in any nonmetallic wireway.
378.22 Number of Conductors. The sum of cross- sectional areas of all contained conductors at any cross section of the nonmetallic wireway shall not exceed 20