Installation Manual

1027144–0001 Draft – Revision D.01 4–6 Installing IFL cables
RT installation
Detailed instructions for installing the IFL and lightning arrestor
are included in the following sections.
Determine the IFL cable route, from ODU to IDU. Consider the
guidelines below. Every building and rooftop is unique; for this
reason, some of these guidelines may not apply to your
installation:
• The most important considerations are the ODU and IDU
locations and the building entry point. The entry point
should be as close as possible to the ODU. Refer to the RT
rooftop drawings. (See also page 5–3.)
• The maximum IFL cable length is 1000 feet (305 meters).
• Where possible, use existing conduit.
• You must use a pull box to facilitate pulling cables through
conduits if routing cable through bends totaling more than
360°.
• If existing conduits can not be used and the cable will be
exposed, refer to building codes to determine proper cable
insulation type. For example, plenum rated cable must be
used if cable will be run above suspended ceilings.
• If you are installing the IFL cable(s) inside a conduit
that contains power cables, you must use plenum–rated
cable.
• Look for cable routes that will be easily accessible, such as
stacked telco closets etc.
• Older buildings may not have stacked telco closets. You
may have to route the cable back and forth, from one side of
the building to the other.
• Never run the IFL cable across corrugated roofing. Run the
cable in the corrugation trough:
hb009
Roof
Ye s
No
Cable
4.5
Determining the IFL
cable route