UM0001

MOBILE HOME SERVICE REQUIREMENTS
ELECTRIC & GAS
1.0
INDEX
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Index
Purpose
General
Reference Material
Typical Underground Utility Layout
Meter Pad Details
General Installation Procedures
Meter Pedestal Specifications
2.0
PURPOSE
The purpose of this standard is to outline methods of providing underground utility service to
mobile homes within the service territory of Sierra Pacific Power Company (SPPCO).
3.0
GENERAL
3.1
In the application of this standard, a mobile home development shall be considered
either a mobile home subdivision or mobile home park.
A. A mobile home subdivision consists of lots for private ownership, where the
lot is owned by an individual.
B. A mobile home park consists of spaces for rent, where the mobile home owner
rents space for his mobile home.
3.2 The developer is responsible for the overall design and installation coordination of
the various underground facilities of his project.
3.3 The developer shall be responsible to contact Sierra during the design phase of his
project to ensure compliance with this standard.
3.4 The developer must follow local codes and ordinances for requirements applicable
to customer facilities from the meter pedestal to the distribution panel board within
the mobile home.
3.5 Main and service layout of electric and other utilities shown in this standard are to
illustrate overall design and installation coordination requirements.
ENGINEERING & CONSTRUCTION STANDARD
SECTION 6 GAS METERING GUIDELINES
DRAWN
DESIGN
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DATE
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5/98
7/06
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REQUIREMENTS FOR ELECTRIC & GAS
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3.6 The developer is responsible to establish finish grade on property prior to start of
construction of Sierra’s facilities.
3.7 Developer shall provide all main trenching, excavation, and backfill in accordance
with Sierra’s standards and specifications. The developer shall provide, install, and
maintain service conduits, meter pads and meter pedestals in accordance with
Sierra’s specifications. In mobile home subdivisions, the owner shall provide, install, and maintain
his service conduits, conductor, meter pad, and meter pedestal.
3.8 The developer shall provide a permanent and clearly marked identification mark
showing address or space number on each meter pedestal and gas house line.
3.9 For feeder facilities, the developer will provide trenching, backfill, and provide and
install other material required under applicable extension rules of Nevada and/or California.
3.10 Sierra will furnish, install, and connect service cables and meters.
3.11 Within its gas service area, Sierra will furnish and install gas meters.
3.12 Meter pads in the immediate vicinity of driveways must be protected by steel posts
as detailed on SPPCO Dwg. PE0009U, “Padmounted Apparatus Barrier Posts”.(Volume 17)
3.13 Meter pad and utility island are defined as follows:
A. Meter Pad - The meter pad is where electric meter pedestals and gas meters are
to be installed. It shall be located in accordance with this standard and at a
location so as to prevent damage to meters resulting from placement of mobile
homes.
1. The developer is responsible to stake locations of meter pads. Locations
shall be approved by Sierra.
2. Adjustments of meter pads and meters due to grade or staking errors shall
be made by the developer or owner at his expense. Work required by Sierra
to adjust our facilities will be charged to the developer.
3. In lot sale developments, the individual owner shall own and maintain the
meter pad and pedestal and all the electrical and gas facilities from the
meter pad to the mobile home.
B. Utility Island - The utility island is a central location for all customer facilities
(electric, gas, water, sewer, telephone, TV, etc.) at the mobile home which allows
the mobile home to be connected to those facilities.
1. Local city/county codes apply to the utility island and to the electric and gas
facilities from the load (customer) side of the meter pad to the utility island.
The developer or owner should consult local city/county building
departments for applicable requirements.
ENGINEERING & CONSTRUCTION STANDARD
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MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
DRAWING NUMBER
UM0001
3.14 When certain conditions are met, a mobile home is no longer classified as mobile, but
considered a modular or permanent building, and treated in accordance with Sierra’s
Residential Service Standards. The following conditions make it a fixed, permanent
residence:
A. It is built in accordance with the National Construction and Safety Standards.
B. It is placed on a permanent foundation.
C. Its owner also owns the land on which it stands.
4.0
REFERENCES
5.0
4.1
SPPCO Standards:
Standard Reference
Trench Excavation Standards TE0001U
Typical Trench Details TE0003U to TE0027U
Trench Bedding & Backfill SUB01X
Cnduit Installation Guide CD0001U
4.2
Other Codes & Rules:
National Electrical Code (NEC)
National Electric Safety Code (NESC)
Mobile Home Setup Guide, Washoe County
Occupational Safety & Health Administration (OSHA)
Uniform Plumbing Code (UPC)
Underwriters Laboratory (UL)
TYPICAL UNDERGROUND UTILITY LAYOUT
5.1 Electric primary and secondary cables will be installed in conduit in joint trench with
telephone and cable TV. The facilities will be within the public utility easement
(PUE) along the front of the lots, with street crossings as required.
5.2 Electric services shall be installed from the nearest electric box or transformer to the meter
pad along side the property line within a 5 ft. PUE, see Detail #5A.
5.3
Mobile home parks can install either:
A. One electric meter pad with double meters, see Detail #5C.
For gas meter location, refer to Detail #6C.
B. Two electric meter pads with single meters, see Detail #5B.
For gas meter location, refer to Detail #6B.
5.4
Mobile home subdivisions shall install single electric meter pads for each lot. The pads
may be on common lot lines, see Detail #5B. For gas meter location, refer to Detail #6B.
5.5
Quadruple electric meter pads may be used in mobile home parks. Approval must be
ENGINEERING & CONSTRUCTION STANDARD
SECTION 6 GAS METERING GUIDELINES
DRAWN
DESIGN
SUPR
DATE
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5/98
7/06
MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
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received from SPPCO prior to construction for correct wire sizing, see Detail #5D. For gas meter
location, refer to Detail #6D.
5.6
Gas services shall be installed from the main located in the street. Common service trench
for electric and gas shall be used to the meter pad location. See Detail #5A.
5.7
Any exceptions in the layout of electric and gas facilities must be approved by SPPCO
prior to construction.
DETAIL #5A
ENGINEERING & CONSTRUCTION STANDARD
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MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
DRAWING NUMBER
UM0001
NOTES:
A. Maximum 15 ft. setback from property line for metering pads. Approval from
SPPCO must be received prior to construction for alternate meter pad locations.
B. Trench centerline to be 30” from back of curb for electric trenches, transformers,
boxes or vaults. If sidewalk is present, trench centerline to be 24” behind
sidewalk.
C. Service trench centerline to be 30” from side property line.
D. Meter pads to be 30” from side property line.
E. Guard posts to be 4" standard steel primed and painted yellow. Posts to be five
feet long, buried two feet in concrete and filled with concrete.
DETAIL #5B
DETAIL #5C
DETAIL #5D
ENGINEERING & CONSTRUCTION STANDARD
SECTION 6 GAS METERING GUIDELINES
DRAWN
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5/98
7/06
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REQUIREMENTS FOR ELECTRIC & GAS
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6.0
METER PAD DETAILS
6.1
See Details #6A, 6B, 6C, and 6D for pad layout and dimensions.
6.2 6” x 6” 10/10 steel mesh shall be used for reinforcing of all pads. Pads shall have a
minimum thickness of four inches.
6.3
For multiple meters, gas house lines shall be offset six inches from service riser.
ENGINEERING & CONSTRUCTION STANDARD
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MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
DRAWING NUMBER
UM0001
DETAIL #6C
DUAL METERS
DETAIL #6D
QUADRUPLE METERS
ENGINEERING & CONSTRUCTION STANDARD
SECTION 6 GAS METERING GUIDELINES
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7.0
GENERAL INSTALLATION PROCEDURES
7.1 This section outlines the general procedures to follow in installing the electric and/or
gas service, meter pedestals and pads.
7.2 The developer/owner obtains SPPCO’s approval on utility layout prior to
construction.
7.3 The developer/owner provides all trenching, excavation and backfill in accordance
with Sierra’s standards.
7.4 Any service conduit/pipe is provided and installed by developer/owner as specified by
SPPCO
7.5 The developer/owner backfills trench to the level of joint utility before joint facilities
are installed.
7.6 The developer/owner in the general sequence listed below, will then install the
electrical grounding system at the meter pad, the meter pedestal and the electric line
from the meter pad to the mobile home.
A. Install the electrical ground and bare copper grounding conductor. The grounding
conductor shall not be connected to the gas pipe system.
B. Install the customer electric line (or conduit) from meter pad location to mobile
home connection point (Utility island).
C. Install the gas service house line.
D. Remove and pull section panel of meter pedestal to allow service cable to extend
through pedestal. Carefully place pedestal over SPPCO’s electric conduit and
customer’s electric conduit. Position meter pedestal as required and plumb and
level pedestal. See Details #6A, 6B, 6C, and 6D.
E. Backfill the installation and compact meter pad subgrade to 90%. Form and pour
the concrete pad. The concrete pad should extend approximately two inches above
finish grade.
F. Connect the grounding conductor to the accessible grounding lug inside the
pedestal. Ground the pedestal by connecting the accessible grounding lug to the
neutral service terminal landing lug.
G. Connect the customer’s electric line.
H. Call for city/county inspection of electric and gas installation, as required.
7.7 Upon approval by inspecting authority, SPPCO will connect the electric service
conductors to the landing lugs in the meter pedestal, install and seal the pull section
panel, and blank off and seal the meter socket ring.
7.8
SPPCO will set the electric and gas meter upon application for service.
ENGINEERING & CONSTRUCTION STANDARD
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MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
DRAWING NUMBER
UM0001
8.0
METER PEDESTAL SPECIFICATIONS
8.1 The meter pedestal shall have a minimum rating of 100 amperes. Construction,
material, corrosive-resistant finish shall be approved by UL.
8.2 The meter socket base be shall be UL recognized and provided with a sealing ring. The
socket shall be factory-wired with the conductors in a separate or barriered raceway
from the utility’s terminating lugs to the meter socket. These conductors shall be
inaccessible from the main disconnect and power outlet section. The conductors
which extend to the meter socket shall be connected at the utility’s terminating lugs
independently of the connection for the customer’s conductors. The minimum meter
height is 36” above grade line when the meter is enclosed, or 48” minimum if exposed.
8.3 The customer’s main disconnect and power outlet section shall have barriers installed
to prevent access to the utility’s cable pull and terminating section and to unmetered
conductors which connect to the socket.
8.4 The utility’s cable pull and terminating section shall be covered with a sealable and
removable panel or panels, extending from two inches to six inches above grade, and
when removed, give full access to the utility’s terminating lugs. Access to the terminating lugs may
be from either the front or the rear of the post. Access shall not be restricted by load conduits or
raceways.
8.5 A minimum 12” opening shall be maintained from the terminating lugs to any fixed
panel below the lugs. The minimum lug height is 18” above grade line; the maximum
is 48”. The terminating lugs shall be twin No. 2 to 350 MCM aluminum bodied pressure type for
connection of the service lateral conductors. The space between terminating lugs, from lugs to sides
of post, or from lugs to panel above shall be one and one half inch minimum. Rigid insulating barriers
are required and shall project one quarter inch minimum beyond any energized parts if this space is
less than one and one half inch. Terminating lugs may be positioned either in-line or staggered. The
neutral terminating lug shall be bondable to the post.
8.6 An accessible grounding lug shall be provided for a minimum #6 to 1/0 AWG
grounding conductor.
8.7 The post shall have a minimum cross sectional dimension of 4” x 8” inside diameter.
A fixed panel shall extend two inch minimum and five inch maximum above grade,
and 18” minimum below grade.
8.8 The minimum depth of the post in the ground shall be 24” with openings at the base
to permit the service lateral conduit or conductors to sweep into the post.
8.9 A moisture barrier, located below all terminals and other live parts, or adequate
ENGINEERING & CONSTRUCTION STANDARD
SECTION 6 GAS METERING GUIDELINES
DRAWN
DESIGN
SUPR
DATE
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5/98
7/06
MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
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ventilation, shall be provided to inhibit the condensation of moisture.
8.10 For authorization to attach telephone and cable TV termination facilities, consult
SPPCO.
8.11 Local codes must be followed for grounding requirements which may exceed those
stated in this standard. A minimum ground shall consist of a continuous bare copper
grounding conductor extending from the neutral service terminal landing lug to a
grounding electrode, which may be either:
A. Ufer type ground as per National Electric Code, Article 250-66.
B. Metallic underground water piping system (not gas) with a minimum buried
portion of ten feet. If the buried portion of the metallic water piping system is less
than ten feet in length, it shall be supplemented with a 5/8” x 8’ copper clad
ground rod.
ENGINEERING & CONSTRUCTION STANDARD
SHEET 21
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SECTION 6 GAS METERING GUIDELINES
DRAWN
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DATE
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5/98
7/06
MOBILE HOME SERVICE
REQUIREMENTS FOR ELECTRIC & GAS
DRAWING NUMBER
UM0001