HANDBOOK REQUIREMENTS - Central Maine Power Company

79
79
Company.
The Company recommends that all underground cable
be installed in conduit.
Galvanized steel conduit or heavy-wall non-metallic
conduit (Schedule 40 minimum) shall be used where the ducts are
under public streets or ways, paved areas, driveways and all
transmission rights-of-way. Where subject to physical damage,
non-metallic conduit shall be schedule 80 minimum (per the
NEC).
In developments or subdivisions, conduit shall be
installed extensively enough to provide a cable raceway under
any existing or anticipated street or driveway. In addition,
for
any buildable lot where the driveway has not been determined
by rough grading or curb opening, the conduit shall extend
across the entire lot.
Conduit under the public way shall be at least 36 inches
below grade and extend at least 48 inches beyond the street limits
or paved areas. For State roads,
it is the customer/developer’s
responsibility
to comply with the Maine Department of
Transportation’s Utility Accommodation Policy for conduits
within the Maine Department of Transportation’s right-of-way.
Conduit placed under private driveways and walks shall be
at least
30 inches below grade and shall extend at least 24 inches
beyond the traveled way.
Non-metallic conduit shall be of approved heavy-wall
(Schedule 40) design unless encased in a minimum of 3 inches of
concrete. All non-metallic conduit used above grade (risers) shall
be of sunlight resistant material, and where subject to physical
damage, shall be schedule 80 minimum (per the NEC).
Back-fill within 6 inches of conduit shall consist of soil
containing no rocks greater than 4 inches in diameter per NESC