Page 135 - Pipeline Rules of Thumb Handbook

122 Pipeline Rules of Thumb Handbook

Table 3C
Maximum Number of Conductors in Trade Sizes of Conduit or Tubing
(Based on N.E.C. Table 1, Chapter 9)

Note: The table is for concentric stranded conductors only. For cables with compact conductors, the dimensions in N.E.C.
Table 5A shall be used.

Reprinted with permission from NFPA 70-1990, The National Electrical Code®, Copyright© 1988, National Fire Protection
Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the National Fire
Protection Association, on the referenced subject which is represented only by the standard in its entirety.

Tables 4 and 5 give the nominal size of conductors and sions represent average conditions only, and variations will be
conduit or tubing for use in computing size of conduit or found in dimensions of conductors and conduits of different
tubing for various combinations of conductors. The dimen- manufacture.

Table 4
Dimensions and Percent Area of Conduit and of Tubing

Reprinted with permission from NFPA 70-1987, National Electrical Code, Copyright 1986, National Fire Protection
Association, Quincy, MA 02269. The reprinted material is not the complete and official position of the NFPA on the
referenced subject which is represented only by the standard in its entirety.