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9 Mobile Home Service Electric Service Requirements
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9 Mobile Home Service
9.1 General
This section covers the requirements for permanent service to mobile single-family units, including
but not limited to mobile homes, houseboats and manufactured homes on temporary foundations.
9.2 Customer Responsibilities
The customer:
1.
Shall provide, install, and maintain all service equipment (including overhead service
entrance conductors, conduit, enclosures, and meter sockets) to include rights-of-way and
space for the installation and maintenance of Power Company facilities.
2.
Should understand the content of Section 1, General Requirements.
3.
Should understand the content of Section 2, Permits and Applications.
4.
Shall have necessary permits and ruling government approvals. Permanent power will not be
connected until all approvals are obtained.
5.
Should understand the content of Section 3, Services and Meter Installations.
6.
Should understand the content of Section 5, Clearances.
7.
When applicable, should understand the content of Section 6, Underground Requirements.
8.
Shall install the meter socket per the requirements of this section. Permanent power will not
be connected if the requirements listed in this section are not met.
The customer should consult the Power Company with questions about these requirements.
9.3 Maximum Available Fault Current
The maximum available fault current will depend on the type of service being provided. The
customer shall furnish equipment to withstand bolted fault currents. Upon request, the Power
Company will supply information on the maximum available fault current at the customers
service entrance.
For single family residences with services of 200 amperes or less, the customer shall furnish
equipment that will withstand a 10,000 ampere fault current.
9.4 Residential Meter Sockets for Mobile Homes
All residential meter sockets shall meet the following criteria:
Requirements:
1.
Meter sockets shall be EUSERC-approved.
2.
Meter sockets shall be ring-type.
3.
Meter sockets shall be furnished with screw-type sealing rings.
4.
Meter sockets shall not be used as junction boxes.
Manual link bypass meter sockets are approved, but not required, for residential services of 200
amps or less. A manual link bypass meter socket should be considered if interruption of power
during routine meter service would create a problem.
Approved residential meter sockets are shown in Figures 7.4.1 and Figure 7.4.2. Electric Service Requirements
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9.5 Meter Socket Location for Mobile Residences
The meter socket shall not be attached to a mobile residence. The customer shall comply with the
following requirements when installing a meter socket for a mobile residence.
Requirements:
1.
The meter socket shall be installed on a pedestal or pole.
2.
The meter socket shall be located at least 3 from gas meters.
3.
The meter socket shall be protected from damage by being located away from vehicle traffic, or
by the use of barrier posts or other suitable protection approved by the Power Company.
4.
The meter socket enclosure shall be permanently labeled with the space or berth number.
5.
The Power Company will determine the exact location of meters that do not meet the criteria
established in this manual. If the customer is unsure if the meter location is acceptable, the Power
Company should be contacted.
9.6 Underground Service to Mobile Homes
9.6.1 General
Underground service can be provided to the customer from either an overhead or
underground distribution system. If the system is underground, all conductors shall be run
in Power Company--approved, customer--installed conduit. The Power Company will
install an appropriately--sized service conductor from its distribution line to the meter
socket.
The Power Company owns and maintains the underground service lateral from the utility
source to the customers service point in the meter socket. The Power Company also owns
and maintains the meter. The customer owns the pedestal, the meter socket, the meter
base, and all wiring beyond the meter socket.
Special rules may apply in some cities where local ordinances require underground service.
Customers in these cities should consult the Power Company.
9.6.2 Requirements
The customer shall:
1.
Furnish and install the meter socket (underground type) per Section 9.4, Residential
Meter Sockets for Mobile Homes.
2.
Furnish, install and maintain an approved pedestal, pole, or wood post. If a wood
post is used, it shall be no less than 6 × 6 and pressure-treated with an American
Wood Preservative Association-approved preservative.
3.
Provide the trench, backfill, compaction and, where required, surface restoration.
4.
Arrange for an appropriate underground facility location before trenching.
5.
Provide and install all conduit from the meter socket to the Power Companys point
of attachment. The conduit shall be rigid steel, fiberglass or Schedule 40 gray PVC
(see Section 6.2, Conduit Requirements). The conduit shall be properly glued.
6.
Install all conduit to NESC code depth (24 below the final grade).
7.
See Table 6.2.1.1 for conduit run and bend limits.
8.
Install a 500 lb. (or greater) test pull line in the conduit. Flat pull lines are preferred.
At least 6 feet of pull line shall extend from each end.
9.
Locate the meter base and meter socket per Section 9.5, Meter Socket Location for
Mobile Homes. The Power Company will determine the exact location of meters that Electric Service Requirements
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do not meet the criteria established in this manual. If the customer is unsure whether
the meter location is acceptable, the Power Company should be contacted.
10. In pedestal installations, keep the access door to Power Company connections free of
obstructions a minimum of 6 above the final grade, with a sealable provision for the
Power Company.
11. See Section 6 for trenching and underground requirements.
12. Ensure that Power Company conduit and conductor trenches are located away from
(and never underneath) the pad, foundation, or area provided for the mobile home.
Figures 9.6.1, 9.6.2 and 9.6.3 show typical underground installations to mobile residences.
Figure 9.6.1 -- Underground Service for Mobile Homes, Pedestal Installation
EUSERC 307
72 Max
42 Min
6 Min
Final grade
Final grade
To mobile home
Circuit breakers
Meter
To Power Company
48 Min.
18---24
Electrical label or permit
must be displayed on
the meter base.
Grounding per NEC Article 250
24 Min.
Set a 1/8 x 1 x 1 steel
angle-drive into the ground and
attach it to each side of the
pedestal with 1/4 or larger bolts.
Note: This pedestal shall not be used for other applications. Electric Service Requirements
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Figure 9.6.2 -- Underground Service, Post-Mounted Installation
6 Max
4 Min
24 Min
Meter
36 Min
Electrical label or permit must be
displayed on the meter base.
Grounding per NEC
24 Min
Use protective bushings on conduit,
as well as blocks and straps to
support the conduit. Electric Service Requirements
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12 to 18 from
pole top to point
of attachment
A 12 maximum conduit
extension from the top of
the pole is allowed.
12 Max
6 Max
3
/
8 Eye-bolt
(customer provides)
6 Max
4 Min
See Section 5 for Clearances
The customer shall provide 5/16 steel cable
galvanized guy as specified in Table 4.2.1, or if
other conditions require guying.
Anchor
rod
Figure 9.6.3 -- Overhead Service to Mobile Homes with a
Customer Underground Service Lateral
5 Min
Guy strain insulator
Power Company
Customer
3
/
8 Eye---bolt
(Customer provides)
Allow 24 tails for
connection to service
Electrical label or permit must be
displayed on the meter base.
Ground in accordance with the
latest issue of NEC Article 250.
Use a minimum no. 6 copper
wire for grounding.
An insulated service
attachment is required
in WA and CA.
24 Min
40 min. between power
and communications
(shall not attach to mast)
NESC
NEC
Guying where appropriate,
see Table 9.6.3
Gravel
backfill
Meter
Additional Requirements:
1.
The customer is responsible for all material and labor beyond the service point at the
customers 24 tail.
2.
The pole shall be no less than 25 long and 5
1
/
2
in diameter at the top, or a
6 × 6 × 25 timber, set no less than 5 below ground level, with gravel backfill. The pole or
timber shall be pressure or thermally treated with an approved preservative.
3.
Additional height may be required to accommodate overhead telephone service or cable TV.
Contact the telephone company and CATV company for required clearances.
4.
Installations in unstable soil shall require guying or bracing. Installations in stable soil shall
adhere to the conductor length limits listed in Table 4.2.1.
5.
The pole or timber shall be accessible by Power Company aerial equipment. Electric Service Requirements
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Table 9.6.3 -- Acceptable Service Conductor Lengths without Guying
(For Single-Family Overhead Service Pole Attachment)
Service Size
Utility Service Length
0 -- 200 Amp Service
60 Max.
201 -- 400 Amp Service
45 Max.
Note: Contact the Power Company regarding longer service lengths and guying requirements.
Guying may be required at these lengths in unstable soil conditions.
9.7 Overhead Service to Mobile Homes
9.7.1 General
Overhead service can be provided to the customer from an overhead distribution system.
For a customer near an overhead line, the Power Company will install a service drop from
the Power Companys line to the pole