INFORMATION & REQUIREMENTS ELECTRIC SERVICE - NStar

ARTICLE 415-417
UNDERGROUND SECONDARY SERVICES
415. Lines of Demarcation
On underground secondary services, all private property
construction beyond the first point of attachment is a part of
the private wiring system, which is furnished, installed, owned
and maintained by the customer, with the exception of such
metering equipment furnished by NSTAR.
416. Size
Underground secondary services from the public way are
restricted to installations where the total required demand load is:
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A. For radial, the maximum combined single and three phase
load to be served from NSTAR facilities in the public way
is limited to 150 kVa or less where available. In the South
districts the single phase services are limited to 75 kVa
demand. Radial service is normally supplied outside the
Downtown Boston Network District.
B. For Downtown Boston Network, New Bedford Network
or Cambridge Network service in the secondary network
service area (which only includes services 300 kVa or less,
three phase, 4 wire, 120/208 volts) where available. All
other loads and voltages require transformation on private
property.
417. Point of Attachment & Minimum Conductor Lengths
For all new installations NSTAR will make the connection to
the first point of attachment to the customer’s wiring
system. In urban districts, a minimum length of 24 inches for
each service entrance conductor shall be left at the terminal
box; at handholes, sufficient cable to extend across the
handhole and at least 3 feet above the top of the handhole
opening is required to provide for connection to NSTAR
ARTICLE 418
service conductors. If the service entrance conductors are
350 MCM or larger, the minimum length of each conductor
shall be 3 feet from connections in terminal box. The final
connections are the exclusive responsibility of NSTAR.
In areas where padmount transformers are provided, a
minimum length of 3 feet at handholes and 7 feet at padmount
transformers shall be left to provide final connections to
NSTAR facilities. The contractor shall leave the coil in the open
trench outside NSTAR facilities or as coordinated with NSTAR.
NSTAR shall make all final connections.
Upon completion of the customer’s wiring work, on all new or
replaced services, NSTAR will make the final connection
between the customer’s service and NSTAR’s distribution
system.The customer shall furnish the following connectors:
A. All aluminum connections.
B. Copper connectors larger than 500 KCMIL.
Contact the NSTAR New Customer Connect Tech Center for
details.
418. Trench for Underground Service
The trench for underground secondary service shall be deep
enough to permit service conductors to be installed not less
than 30 inches below finished grade or as required by the
authority having jurisdiction. The trench bed shall have a
uniform pitch and be free of large stones. Rock foundations
shall be covered with 3 inches of fine compacted fill.When
backfilling, the first 6 inches shall be fine fill and hand tamped.
Large stones shall be removed from the final fill, which may be
tamped with power tampers. All digging will be the customer’s
responsibility, and shall be subject to inspection by a NSTAR
representative prior to backfilling.
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