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Chapter 6
Electrical Connections
6-1 General
All electrical equipment and installations must be designed, constructed, and installed in accordance with this code and where not
specific, to the applicable provisions of the Oregon Electrical Specialty Code.
Alternate methods permitted in the Oregon Electrical Specialty Code, but not mentioned in this code may be permitted if acceptable to
the building official. See Section 1-3.9.
All electrical equipment, materials, devices, appliances, and fittings must be listed and labeled for it’s intended use, and installed
according to this code and where not specific, to the Oregon Electrical Specialty Code.
For the purposes of inspection, all electrical connections must be accessible for inspection by the building official, including excavations
containing electrical equipment.
6-2 Electrical Feeders
Manufactured dwelling feeder conductors must consist of one of the following:
o A listed factory installed or provided power cord, connected according to the manufacturer’s installation instruction or this code.
o A permanently installed overhead feeder containing four insulated conductors listed for use and sized according to Table 6-2.1(a).
o A permanently installed overhead feeder containing three insulated conductors listed for use and sized according to Table 6-2.1(a).
An “uninsulated” messenger of a factory assembled quadraplex cable must be installed in compliance with the applicable provisions
of Oregon Electrical Specialty Code, Articles 230.24, 230.32, and 550-10.
o A permanently installed underground feeder containing four insulated conductors listed for use and sized according to Table 6-2.1(b).
o A permanently installed feeder installed by the manufacturer according to DAPIA approved plans when the service equipment is
mounted on the home at the manufacturing plant.
o A permanently installed feeder containing four insulated conductors and protected in an approved raceway in or through the floor,
wall, or roof or under the chassis when the service equipment is mounted on the manufactured dwelling on site.
The green colored insulated conductor of the feeder must be connected to the grounding bar inside the main electrical distribution panel
and to the grounding bus inside the service entrance equipment located on or adjacent to the manufactured dwelling.
The neutral bar must be isolated from the ground bar inside the main distribution panel or inside any junction box used in conjunction
with the manufactured dwelling branch circuit or feeder.
Feeder Sizing
Feeder size is based on the amperage of the main circuit breaker inside the manufactured dwelling’s main distribution panel.
Feeders must be sized adequately to carry the combined loads of the manufactured dwelling and all external accessories receiving power
from the main distribution panel. (i.e. air conditioner, heat pump, accessory buildings, accessory structures, or water and sewer pumps).
Overhead feeders must be sized according to Figure 6-2.1(a)
Underground feeders and conduit must be sized according to Table 6-2.1(b).
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Table 6-2.3(a) Above Ground Feeder Conductor Clearances
Amperage of
Home
Conductor Use
Number of
Conductors
Wire Size
(Copper)
Wire size
(Aluminum)
50 Amps
Ungrounded
2
# 8
# 8
Grounded
1
# 10
# 10
Grounding
1
# 10
# 8
100 Amps
Ungrounded
2
# 4
# 3
Grounded
1
# 6
# 4
Grounding
1
# 8
# 6
150 Amps
Ungrounded
2
# 2
# 1/0
Grounded
1
# 3
# 1
Grounding
1
# 6
# 4
200 Amps
Ungrounded
2
# 1/0
# 3/0
Grounded
1
# 1
# 1/0
Grounding
1
# 6
# 4
225 Amps
Ungrounded
2
# 2/0
# 4/0
Grounded
1
# 1/0
# 3/0
Grounding
1
# 4
# 2
NOTES:
(1) Insulation type shall be type THW, THWN, or THHW only.
(2) For installations not specifically covered in this table see the Oregon Electrical Specialty Code for
further information.
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Table 6-2.3(b) Underground Feeder Conductor Clearances
Amperage
of Home
Conductor
Use
Number of
Conductors
Wire Size
(Copper)
Wire Size
(Aluminum)
Conduit Size
(Copper)
Conduit Size
(Aluminum)
50 Amps
Ungrounded
2
# 6
# 4
1 in. I.D.
1 in. I.D.
Grounded
1
# 8
# 6
Grounding
1
# 10
# 8
100 Amps
Ungrounded
2
# 4
# 2
1 in. I.D.
1-1/4 in. I.D.
Grounded
1
# 6
# 3
Grounding
1
# 8
# 6
150 Amps
Ungrounded
2
# 1
# 2/0
1-1/4 in. I.D.
1-1/2 in. I.D.
Grounded
1
# 2
# 1/0
Grounding
1
# 6
# 4
200 Amps
Ungrounded
2
# 2/0
# 4/0
1-1/2 in. I.D.
2 in. I.D.
Grounded
1
# 1/0
# 2/0
Grounding
1
# 6
# 4
225 Amps
Ungrounded
2
# 3/0
250 MCM
2 in. I.D.
2 in. I.D.
Grounded
1
# 2/0
# 4/0
Grounding
1
# 4
# 2
NOTES:
(1) Insulation type shall be type USE, UF, THW, THWN, or THHW only.
(2) Conduit sizes are based on Schedule 40 PVC only.
(3) For installations not specifically covered in this table see the Oregon Electrical Specialty Code for
further information.
Feeder Installations
Feeder installations, whether cord connected, overhead, or underground must be installed according to this code and to the electrical
equipments listing, and where not specific, to the Oregon Electrical Specialty Code. Clearances must be according to Table 6-2.1(a) for
above ground feeder conductors and Table 6-2.1(b) for underground feeder conductors.
Electrical equipment or materials may not obstruct the access to the under-floor area.
Conduit must be installed and secured at the intervals required in Table 6-2.3(c).
Feeders must be connected to the electrical service disconnect within view of the manufactured dwelling and within 30 ft. of the
manufactured dwelling exterior wall.
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Table 6-2.3(a) Above Ground Feeder Conductor Clearances
Location
Minimum Height
Above Roof Surface
8 ft.
Above Roof Ridge
3 ft.
Above Pedestrian Access
10 ft.
Above Private Driveways
12 ft.
Above Public Driveways
18 ft.
Above Alleys and Streets
18 ft.
NOTES:
(1) Exceptions to Article 230-24 of the Oregon Electrical Specialty Code.
(a) The area above a roof surface subject to pedestrian or vehicular traffic shall have a vertical clearance
from the roof surface in accordance with the clearance requirements of Section 230-24(b).
(b) A reduction in clearance to 3 ft. shall be permitted where the voltage between conductors does not
exceed 300 volts and the roof has a slope of 4 in. in 12 in. or greater.
(c) Where the voltage between conductors does not exceed 300 volts, a reduction in clearance above only
the overhanging portion of the roof not less than 18 in. shall be permitted if (1) not more than 6 ft. of
service-drop conductors, 4 ft. horizontally, pass above the roof overhang, and (2) they are terminated at
a through-the-roof raceway or approved support.
(d) The requirement for maintaining the vertical clearance 3 ft. from the edge of the roof shall not apply to
the final conductor span where the service drop is attached to the side of the building.
(2) For installations not specifically covered in this table see the Oregon Electrical Specialty Code for
further information.
Table 6-2.3(b) Underground Feeder Conductor Clearances
Location of Wiring Method
Direct Burial
Cable
Rigid Metal
Conduit
Rigid Non-
Metal Conduit
Branch Circuit 20
Amp max.
All Locations not specified
below
24 in.
6 in.
18 in.
12 in.
Trench with 2 in. thick
concrete cover
18 in.
6 in.
12 in.
6 in.
Under 4 in. concrete slab
extending 6 in. over wiring
18 in.
4 in.
4 in.
6 in.
Under Streets & Driveways
and Parking Lots
24 in.
24 in.
24 in.
24 in.
1 & 2 Family Driveways and
Parking Areas
18 in.
18 in.
18 in.
12 in.
NOTE:
For installations not specifically covered in this table see the Oregon Electrical Specialty Code for further
information.
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Table 6-2.3(c) Electrical Raceway Securement Schedule
Conduit Type
From Termination Point
(J-Box)
Intermediate Support
Electrical Metallic Tubing
3 ft.
10 ft.
Electrical Nonmetallic Tubing
3 ft.
3 ft.
Flexible Metal Conduit
12 in.
54 in.
Intermediate Metal Conduit
3 ft.
10 ft.
Liquidtight Flexible Metal Conduit
12 in.
54 in.
Liquidtight Flexible Nonmetallic
Conduit
12 in.
3 ft.
Rigid Metal Conduit
3 ft.
16 ft.
(1)
Rigid Nonmetallic Conduit
3 ft.
5 ft.
(1)
NOTES:
(1) Spacing of supports is based on 2 in. diameter conduit only and will vary for smaller or larger sizes
according to the Oregon Electrical Specialty Code.
(2) Raceways shall have hangars, slings, clamps or brackets which do not compress, distort, cut, or
abrade the raceway.
(3) For installations not specifically covered in this table see the Oregon Electrical Specialty Code for
further information.
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Figure 6-2.3(a) Typical Cord Connected Feeder Installation
Figure 6-2.3(b) Typical Overhead Feeder Installation
Figure 6-2.3(c) Typical Underground Feeder Installation
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Temporary Feeder Installations
Manufactured dwellings installed for display purposes only must have electrical installations completed according to Section 6-2.5.
6-3 Electrical Service Equipment
Service equipment for a manufactured dwelling must be provided for a manufactured dwelling by one of the following methods:
o Service equipment may be installed on the manufactured dwelling at the factory during the initial construction.
o The service equipment may be field installed on the manufactured dwelling at the installation site.
o The service equipment may be installed on a pole or as an approved pedestal adjacent to the manufactured dwelling.
o When service equipment is installed on a permanent detached structure (i.e. garage, cabana, or accessory building) on the same site it
must be within 30 feet and in sight of the manufactured dwelling, or a disconnect means may be provided within 30 feet and in site of
the manufactured dwelling.
Note: Service equipment and service equipment grounding is not under the scope of the license for manufactured dwelling installers, limited
installers, or limited skirting installers.
Figure 6-3.1 Typical Demarcation between Feeder and Service
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6-4 Electrical Crossover Connections
Crossover Connection
Multisection manufactured dwellings must have the electrical crossover circuits connected according to the following:
o A minimum of 12 inches above the base flood elevation.
o With approved connectors and contained within junction boxes or within wall or floor cavities, or other areas designated by the
manufacturer.
o Remain accessible.
o Must have physical protection and suitable terminations according to the Oregon Electrical Specialty Code.
Component Interconnection Devices
When provided by the home manufacturer, interconnection
devices may be used provided the interconnection meets
Section 6-4.2.
Hard Wire Connections
When provided by the home manufacturer, junction boxes may
be used provided the installation meets Section 6-4.3.
Figure 6-4.2 Typical Component Interconnection Devices
Figure 6-4.3 Typical Hard Wired Crossover Connection
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Bonding
Multisection manufactured dwellings must be bonded together at the marriage line. Each steel chassis must be either:
o Be bonded to the adjacent chassis with a solid or stranded, green insulated or bare number 8 copper conductor secured to connectors
supplied by the manufacturer.
o Be bonded to the adjacent chassis with bolts or rods capable of conducting current from one chassis to another. Star washers, self
tapping or self drilling screws, or similar paint penetrating devices must be used to provide an effective bonding path between each
chassis.
6-5 Installation of Site-Installed Electrical Equipment
Electrical equipment and fixtures (i.e. ceiling fans, chandeliers,
exterior lights, and mechanical equipment) that are shipped-
loose with the manufactured dwelling must be installed on site
according to the equipment manufacturer’s installation
instructions and in accordance with the Section 6-5.1.
Note: A licensed manufactured dwelling installer or limited
installed may connect site-installed electrical equipment and
fixtures.
Note: Heat tape when used, must be connected to the heat tape
receptacle outlet under the manufactured dwelling near
the main water inlet. Heat tape must be listed for
manufactured home use and installed according to the
heat tape manufacturer’s installation instructions.
Figure 6-4.4 Typical Chassis Bonding Crossover Connection
Figure 6-5.1 Typical Site Installed Electrical Equipment and Fixtures
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6-6 Electrical Testing
Required Tests
Each manufactured dwelling must be subjected to electrical testing after all electrical connections have been made.
o A polarity test to determine connections have been made properly.
o A continuity test to ensure that metallic parts are properly bonded.
o Ground fault circuit interrupters (GFCI) must be tested for proper function.
o Operational tests of devices, especially smoke alarms. This does not including certain appliances like water heaters, electric ranges,
electric furnaces, dishwashers, etc.
Test Failures
Upon failure of any of the above tests, check all applicable field connections, correct any faults, and re-test. If tests continue to fail, notify
factory authorized service personnel immediately and report failures. Other than during testing, do not energize the manufactured
dwelling until all faults in the electrical system have been corrected.
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END
