Install Cable Enclosures, Wall Boxes, and Branch Cables
8-10
.
Using the formula and the examples given below, calculate the correct size
conduit to be used to enclose the branch cables in each run.
Formula
Conduit Cross-Sectional Area = 3.33 x (Sum of Cables Cross-Sectional
Areas)
Note
If the conduit cross-sectional area does not exactly equal the cross-sectional
area of the standard conduit sizes, select the next largest size.
Example
One (1) XSDC and two (2) SDC branch cables are to run together in one
conduit. What is the proper size conduit to use?
Conduit Cross-Sectional Area = 3.33 (0.15 ± 0.09 + 0.09) sq. in.
Conduit Cross-Sectional Area = 1.10 sq. in.
Therefore, the 1 1/4-inch conduit (1.54 sq. in.) should be used.
Table 8-1: Selecting Conduit Size
Cables
Diameter (inches)
Nominal
Cross-sectional
Area (sq. inches)
UTP Cables 0.196 0.03
SDN Cables:
SDC, Part No. 8120-3502
0.34 0.09
XSDC, Part No. 8120-
3595
0.44 0.15
Conduit Sizes: 0.75 0.44
1.00 0.79
1.25 1.54
2.00 3.14
3.00 7.07
To Next Page
Loading...
