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SECTION 900 UNDERGROUND SERVICE

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SECTION
900

UNDERGROUND
SERVICE



901
Undergrounding in New Residential Developments


901.1 RPU requires the complete underground installation of
primary and secondary distribution service laterals to new structures
in all residential zones, except in those cases where it is determined
that such underground installations are either technically or
economically undesirable.


901.2 RPU will designate a junction point for the connection of the
Customer's secondary underground service lateral. The junction
point will be a service pedestal or junction box, the terminals of a
pad-mounted transformer, or a meter enclosure. In general, RPU
will install, own, operate, paint Munsell green, and maintain all
facilities on the source side of the junction point, including the
junction enclosure and connections; and the Customer will install,
own, operate, and maintain all secondary cables, conduit, and
related service equipment specified in other sections of this
publication on the load side of the junction point. However, the
developer of a new subdivision is responsible, during general
development, for installing road crossing conduits per RPU
specifications. (Refer to Section 1000, Exhibit 13.)


901.3 Junction points will be located within RPU's easement area
along or near a front or rear property line unless it is necessary or
desirable to designate locations which are closer to the metering
point(s). In such cases, the Customer will be charged for the
installed cost of any additional lengths of underground distribution
cable and conduit from the property line to the junction point. Such
charges shall be in addition to any other charges specified herein.


901.4 RPU's primary and/or secondary distribution laterals will
normally be installed within front lot line utility easements provided by
the Customer as a part of the recorded property plat. All utility
easements requested by RPU are to be granted by the Customer at
no cost to RPU.


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901.5 Additional information regarding RPU and customer
responsibilities for URD installations is provided in Section 1000,
Exhibit 9.

902
Residential Undergrounding in Overhead Areas


Customers residing in residential zones served by overhead lines
may request underground electric service. Customers intending to
relocate, upgrade or replace an existing overhead service may
request underground service. In either case, the Customer shall
install, own, operate, and maintain the facilities specified in Section
901.2. In addition, the Customer will be charged an amount which
reflects any additional cost incurred by RPU in providing service to
the junction point. All such charges must be paid by the Customer
before RPU will commence installation of the necessary facilities.

903
Underground Service to Commercial and Industrial Customers


903.1 RPU requires the underground installation of primary and
secondary distribution service laterals to new commercial and
industrial structures.


903.2 RPU will designate a junction point for the connection of the
Customer's secondary underground service lateral. The junction
point will normally be the secondary terminals of a pad-mounted
transformer placed at a mutually agreeable location on the
Customer's property, as close as practicable to the metering point.


903.3 RPU will install, own, operate, and maintain the primary
underground cable, the distribution transformer, and the secondary
connections.


903.4 The primary cable will be installed in Schedule 40 PVC
conduit, sized to RPU construction standards from RPU's main
distribution system, on or adjacent to the Customer's property, to the
distribution transformer. If underground main distribution facilities
are located on the Customer's property, the Customer shall provide
the conduit from a designated tap point to the distribution
transformer. If overhead main distribution facilities are located on the
Customer's property, the Customer shall provide conduit to be
installed by RPU on the riser pole and the Customer shall provide
and install the conduit including the elbow, from the riser pole to the

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pad mounted distribution transformer. See Section 1000, Exhibit 8
for details.


903.5 The Customer shall install, own and maintain a concrete
transformer pad to RPU specifications. If the transformer is located
in an area where it may be subject to physical damage (e.g. from
vehicular traffic), RPU may require the Customer to furnish and
install an approved means of protection.


903.6 The Customer shall install, own, and maintain all secondary
cables, conduits, and cabinets from the transformer to the building
service entrance; the cables and conduit shall be buried 24 inches
minimum below final grade. If service is such that a secondary
lateral is to be installed directly from RPU's main secondary
distribution system, the secondary cables and conduit shall be
installed, owned, and maintained by the Customer. (Conduit for the
riser pole, if required, shall be furnished by the Customer.) RPU
must approve the design of all secondary bus duct and cable bus
designs. The installation will be inspected by RPU and the
secondary connections to the transformer, and the transformer side
of the connection cabinet will be made by RPU. It is the Customer's
responsibility to coordinate with and provide the necessary
information to RPU to assure that adequate connections are made at
the secondary terminals of the transformer.


903.7 RPU will furnish and install the meter set in accordance with
the requirements of Section 600.


903.8 The maximum number of secondary connections available
shall be:

Single
Phase:



Six (6)350 MCM conductors per phase




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Three
Phase:



Transformer Size

# of Conductors per Phase
45 KVA
3
75 KVA to

500kVA 6
750kVA to 1500kVA
10

2000kVA to 2500kVA
10

The maximum size secondary conductor to be installed in a 3-phase
transformer is 600 MCM.

Any service requiring more conductors per phase than listed above
must utilize a customer-provided secondary connection cabinet.


903.10 Secondary cables installed in an RPU manhole must be
copper conductor.

903.11 Secondary cables installed to a three phase pad-mounted
transformer should be copper.




904
Secondary Connection Cabinets

Where secondary connection cabinets are necessary, the following
apply:

904.1 Cabinet assemblies will be suited to the installation and meet
RPU and National Electric Code (NEC) requirements.

904.2 Cabinets shall be constructed with provisions for bar-type or
donut-type current transformers.

904.3 Conduits from service equipment to connection cabinet and
from transformer to connection cabinet will be furnished and installed
by electrical contractor as concrete pads are being formed and
poured. Conduit systems shall meet RPU requirements. Above-
grade raceway from the transformer to the connection cabinet is not
allowed.





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905 Transformer
Clearances


Where pad mounted transformers and equipment in pad mounted
enclosures are installed, the minimum clearances specified in
Section 1000, Exhibit 7 must be maintained. Fences, shrubbery,
and trees may be installed by the Customer provided that the
specified clearances are maintained, the grade is not altered, and
the underground cables are not endangered.

906 Winter
Installation


Underground cable installation at the Customer's request between
December 1 and April 30 will be subject to a winter installation
charge. See Section 1000, Exhibit 10 for details.

907 Total
Undergrounding


RPU does not install underground vaults, manholes, or submersible
transformers on Customer property. If the presence of permanent
structures up to the property lines, or other conditions, precludes the
installation of pad mounted equipment on the Customer's property,
primary service will normally be provided.