HANDBOOK REQUIREMENTS - Central Maine Power Company

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Customers electing to install conduit for additional
protection for direct buried cable will be required to meet all direct
buried trench requirements unless the conduit used meets the
Company's conduit specifications for a continuous
conduit system.
912. BURIAL DEPTHS
A minimum ground cover of 30 inches for cable
operating above 600 volts phase to phase and 24 inches when
operating at or below 600 volts phase to phase shall be provided.
(Refer to Illustrations
No.s 18, 19 and 20 in Section XII).
Galvanized steel conduit or heavy-wall, non-metallic
conduit (Schedule 40 or 80) shall be used under public streets
or
ways, paved areas, driveways and all transmission rights-of-way.
It shall be placed at least 36 inches below grade and shall extend
at least four feet beyond street limits or paved areas.
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.
Conduit may be used by the Customer outside public
streets, ways, or paved areas and if used shall be galvanized steel
or heavy-wall non-metallic at least 30 inches below grade for
cable operating above 600 volts and at least 24 inches below grade
for cable operating at or below 600 volts phase to phase.
Where ledge excavation
is necessary and subject to advance
Company
approval, a reduction of cover may be allowed where
supplemental protection is provided as permitted by NESC
Section 352 D or NEC Sections 300.5 and 300.50.
913. SEPARATION OF FACILITIES
The separation of
direct buried secondary or primary cables
and
ducts containing secondary or primary cable from all other