Quantcast Aerial -Cont.

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Span lengths should not to exceed 33 m (100);
Material condition of existing poles;
Guying requirements; and
Building attachments and service entry.
c)  When routing backbone cable over an aerial pathway,
the RCDD must account for a wide range of vertical clearances.
Telecommunication cable clearances as established in NFPA 70 are:
1.01 m (40 in.) below power cables at the
power pole;
(2)  .305 m (12 in.) below power cables at mid-span
under sag conditions;
.103 m (4 in.) horizontally at building
.305 m (12 in.) vertically at building
(5)  5.5 m (18 ft.) vertically above a street or
driveway, higher if normal vehicle traffic exceeds this height;
3 m (9.5 ft.) above pedestrian traffic;
2.44 m (8 ft.) above crossed rooftops;
8.23 m (27 ft.) above railroad tracks; and
(9)  1.83 m (6 ft.) parallel to rooftop conductors
such as antennas, etc.
d)  It is necessary to ensure that poles to be used in
the aerial pathway are materially sound enough to support the
installation size and physical support requirements.  As new
cables are added to pole lines, additional guy wires are required
at each turn and at the beginning and end poles to ensure proper
balancing of pathway stress points.  Copper cable selected for
placement on aerial pathways should be manufactured to REA PE-22
or REA PE-38, Self Supporting Cable standards.  Fiber optic cable
should be tight buffered, loose tube with an outside sheath
manufactured to withstand continued exposure to ultraviolet light
deterioration.  Installation of copper cable over 100 pair should
be installed on separate support strands.  Fiber optic cable and
copper cable under 100 pair can be installed with individual


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