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Vertical Installation
The requirements of your application may require a vertical
installation. You can install fiber optic cable vertically in trays, shafts,
or towers. Dielectric cables are recommended for applications
requiring high vertical installations.
Plans for Vertical Cable Installation
Use the following guidelines when planning a vertical cable
installation.
1. Clamp cable to give extra support while preventing ice loading
and wind slapping.
Your specific environment determines where you should clamp
your cable. Clamping intervals can be as short as 3 feet (1 meter)
and as long as 50 to 100 feet (15 to 30 meters) in interior
locations.
Cables in vertical cable shafts are generally clamped directly to
the walls of the shaft.
Cables installed in elevator shafts are usually supported by
suspension strands and suspended from the top of the shaft. The
suspension strand is attached to the wall at frequent intervals
and at the bottom of the shaft. Consult your local codes and
practices for installation in an elevator shaft.
2. Plan cable runs that keep bends to a minimum.
3. Drill all holes for the entire run large enough to accommodate
steel sleeves when passing cables through walls and floors.
The inside diameter of steel sleeves should be 4 times the
diameter of the cable. The minimum diameter of a steel sleeve is
2in (5cm).
Steel sleeves are required to run cable through a firewall.
Consult your local codes and practices for installations through
firewalls.
4. Measure and record optical cable loss using a fiber optic
power meter.
5. Seal the ends of the cable until they are connected.
Publication 1756-TD008A-EN-P - August 2002
8-9
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