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MIL-HDBK-1012/3
methods.  The first is by placing a conductive identification
tape 155 mm to 243 mm (6 in. to 9 in.) below grade approximately
432 mm (16 in.) above the cable along the trenched route.
Secondly, marker posts or flags should be placed aboveground
along the trenched path at intervals not to exceed 78 m
(250 ft.).  The markers should also be placed at road crossings
and bends.  The next successive aboveground marker should be
easily visible when viewed standing next to a marker.  Splicing
of direct buried cable may be accomplished aboveground in splice
pedestals or in buried splice cases if reentry is not
anticipated.  Selection of splice pedestals should be based on
cable sizes and types (refer to manufacturer recommendations for
pedestal sizing).  Direct buried cable is not recommended for
areas with a high volume of motorized traffic such as parking
lots or road crossings.  Cable run under roads should be placed
in either rigid galvanized or PVC Schedule 40 duct.  EIA/TIA 569
and REA TE&CM 640, Buried Cable Plant Specification provide
additional information for developing buried cable design.  Cable
segments between buildings or splice points should be measured
using a distance wheel.  Sufficient cable should be specified for
splicing and termination at each end of each cable segment.  A
length of 3 m (10 ft.) at each end of the cable should provide
sufficient slack for splicing or termination.  When fiber optic
cable is directly buried, a service loop of 8.3 m to 17 m (25 ft.
to 50 ft.) should be provided at each end.
Warning:  Personnel hazard.  Prior to initiating any
trenching or plowing for direct burial cable placement, the local
Public Works Office, CATV company, and commercial Miss Utility
must be notified 48 hours in advance to locate and identify other
utility services located in the installation area.  The other
services can be in the form of gas lines, power cables, water
lines, CATV lines, etc.
It can be advantageous to the RCDD and subsequent
installation activity if the routing of other services within the
area are identified and marked during the site survey process and
again just prior to installation activity.  Chapter 15 of the
BICSI Manual provides recommended minimum space requirements
between telecommunication cabling and utility services.
1.8.4.2
Underground
a)  An underground cable support structure consists of
the burial of conduit, manholes, and handholes for pathways
between termination locations.  An underground support structure
provides the following advantages over other methods:
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