Installation
8-9
Install Cable Enclosures, Wall Boxes, and Branch Cables
It is the customer’s responsibility to install standard NEMA switch wall
boxes, cable enclosures, and the required number of branch cables from
the ACC to each wall box. Installation of the wall boxes and branch cables
must be done in accordance with local and national building codes.
Install Branch Cable Enclosures
It is the customer’s responsibility to supply and install suitable cable
enclosures such as conduit, troughs, raceways, and so on to protect the
branch cables from damage.
Cable enclosures must be dedicated for SDN branch cable runs, or may be
grouped together. Do not route or place branch cables with other electrical
cables in a cable enclosure.
Cable enclosures must be located as far away as possible—at least 0.3
meters (1 ft.) away—from AC power lines, air conditioning systems,
diathermy units, and so on to minimize RF and AC interference.
The size of the cable enclosure is based on the size and number of branch
cables running together in the enclosure. The cable or group of cables may
occupy up to 30% of the cross-sectional area of the cable enclosure.
A simplified method for selecting the appropriate conduit size is
illustrated in Table 8-1 on page 8-10.
For single branch cable runs, it is recommended that 3/4-inch conduit be
used for SDC and 1-inch conduit be used for XSDC.
Selecting Conduit Size
Conduit size is directly dependent upon the bends and corners that occur
in the run. As a general rule, when conduit bends and corners exist, the
conduit size must be chosen so that the cable(s) occupy up to 30% of the
cross-sectional area. For straight conduit runs, the enclosed cable(s) may
occupy up to 50% of the cross-sectional area.
The following table lists the cross-sectional areas and sizes of SDN branch
cables, some common 780 analog cables, and several conduit sizes
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