HANDBOOK REQUIREMENTS - Central Maine Power Company

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Section 321 B. 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 grade (and at least 12 inches above the conduit per NEC
Section 300.5).
Upon installation, all ducts shall be clean and free of
debris. Any empty ducts shall be capped. An acceptable pull rope
must
be provided by the customer in all ducts to facilitate the
installation of cable. A 1/4 inch polypropylene rope, or other line
of equal or greater strength, is required.
Conduit installed through a building wall shall have internal
and external seals intended to prevent the entrance of gas into the
building insofar as practical (NESC 322 B 4).
B. CONTINUOUS CONDUIT SYSTEMS
Continuous conduit runs should not normally exceed 200
feet, with not more than the equivalent of two 90° and one 45°
bends (225° total) in the run. Longer runs require engineering
review. Multiple layer conduit configurations must be encased in
concrete. Conduit will be properly pitched (3" per 100'
min) for
drainage and provisions will be made to allow the conduit to
drain. The Company may require splice boxes or manholes at the
riser pole and in the conduit run for drainage and to facilitate cable
installation.
Refer to Illustration No. 10 in Section XII for
Underground Secondary Service Continuous Conduit. Note: To
comply with NEC Section 300.5 (J), a conduit slip or expansion
joint shall be provided under the meter socket as shown on
Illustration No. 10 in Section XII. The Company will provide
design requirements and specifications for other conduit systems.