HANDBOOK REQUIREMENTS - Central Maine Power Company

All 90° bends will be galvanized steel and have the
following minimum radii:
CONDUIT SIZE MINIMUM RADIUS
2" 24"
2 1/2" 24"
3" 36"
4" 48"
5" 48"
6" 48"
(Two (2) 45° PVC bends shall not be used in lieu of a steel 90°
bend.)
911. DIRECT BURIAL PRIMARY CABLE
Single-phase direct burial primary cable may be furnished
and installed by the Company (at the customer’s expense) in the
customer's trench or duct as provided below. Direct burial cable
may
be furnished and installed by the customer;
however,
particular notice should be made of the maintenance provisions
of
Paragraph 916.
Direct burial cable shall be protected for 6 inches above and
below by a bedding of soil containing no rocks. The remainder of
the back-fill shall consist of clean fill containing no rocks larger
than 4 inches in diameter. Bedding and back fill shall be free of
roots,
stumps and other debris. During back-filling of the trench,
a plastic ‘ELECTRIC” marker tape (furnished by the Company if
Company owned cable) shall be installed approximately 12 inches
below final grade (and at least 12 inches above the cable per NEC
Section 300.5).
A suitable duct must be installed under public streets or
ways, paved areas, driveways and all transmission rights-of-way.
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