Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 44

VILLAGE OF KEY BISCAYNE UNDERGROUNDING OF UTILITIES — MASTER PLAN
the feeder lines with fused switches. The feeder lines are interconnected
to provide redundancy, but generally the radial distribution lines are
not interconnected. Conversely, an underground system will have
interconnected feeder lines and distribution lines. This enhances reliability
of the system as it provides multiple feed sources as opposed to a radial
system that provides only one electric feed source.
In general, there is very little choice in the type of equipment that is installed
when performing an underground conversion project. All of the equipment
and materials that are installed are provided by FPL so they are consistent
with their electrical distribution standards. This is done in an effort to
maintain system consistency and cost efficiency in both installation and
maintenance. That being the case, there are now two equipment aspects
of the design where the municipality can make a preference decision.
Two types of switch cabinets can be provided by FPL based on preference
or circumstance; the standard “PME” switch cabinet or the “Vista” switch
cabinet.
 The standard PME switch cabinet is the cabinet that is deployed
most commonly in the FPL electrical distribution system.
 The Vista cabinet has a slightly smaller footprint, is shorter, and
only requires eight feet of clearance on one side of the cabinet and
3 feet on the sides and rear rather than all sides like the standard
switch. This offers some unique advantages when the equipment
is required to be placed in tight spaces or
there is an aesthetic requirement that dictates
the smaller cabinet. The Vista cabinet is also
hermetically sealed to prevent water intrusion.
A significant drawback of the Vista switch
cabinet is that it costs approximately $60,000
more than a standard switch cabinet. For this
reason, our opinion of cost has separated the
added cost of installing Vista cabinets so the
Village can contemplate the level of investment
that makes sense. In reality, due to space
constraints, some Vista cabinets may be
required regardless of the desire for resiliency.

Two types of concrete pads for transformers can also be provided
by FPL based on preference. One of the major concerns of
the Village is the consistent flooding of low lying areas. When
transformers are flooded, FPL cannot service them until the water
recedes. FPL now offers the choice of the standard 6" concrete
transformer pad, two 6" pads stacked, or a 24" concrete pad,
which will raise the transformer an additional 18" above grade. With
concerns about sea level rise and potential for storm surge from
hurricanes, the additional cost of concrete for the taller pads may
be warranted in low lying areas.
FPL will perform the electrical design for the program followed by
Kimley-Horn developing the supplemental conduit plans to aid the Village’s
contractor in installing the conduit for the project. FPL has communicated
the following general guidelines related to the design of the improvements.
 All FPL electric infrastructure shall be designed and constructed
in accordance with the FPL Distribution System Standards, latest
edition. All electrical design decisions will ultimately be made and/or
approved by FPL.
 In general, overhead electrical infrastructure located in rear
easements will be relocated to a front street location. There is an
exception, such as the multifamily buildings on Galen, Sunrise,
and E Enid Drives, where the buildings are served from existing
transformers at the rear of the building. As long as FPL has access
FPL PME switch cabinet
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FPL Vista switch cabinet