Chapter 6 Electrical Connections
[Pages:10]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). Page 1 of 10
Amperage of Home
Table 6-2.3(a) Above Ground Feeder Conductor Clearances
Conductor Use
Number of Conductors
Wire Size (Copper)
Wire size (Aluminum)
Ungrounded
2
# 8
# 8
50 Amps
Grounded
1
# 10
# 10
Grounding
1
# 10
# 8
Ungrounded
2
# 4
# 3
100 Amps
Grounded
1
# 6
# 4
Grounding
1
# 8
# 6
Ungrounded
2
# 2
# 1/0
150 Amps
Grounded
1
# 3
# 1
Grounding
1
# 6
# 4
Ungrounded
2
# 1/0
# 3/0
200 Amps
Grounded
1
# 1
# 1/0
Grounding
1
# 6
# 4
Ungrounded
2
# 2/0
# 4/0
225 Amps
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.
Page 2 of 10
Table 6-2.3(b) Underground Feeder Conductor Clearances
Amperage Conductor Number of Wire Size Wire Size Conduit Size
of Home
Use
Conductors (Copper) (Aluminum)
(Copper)
Conduit Size (Aluminum)
Ungrounded
2
# 6
# 4
50 Amps
Grounded
1
# 8
# 6
1 in. I.D.
1 in. I.D.
Grounding
1
# 10
# 8
Ungrounded
2
# 4
# 2
100 Amps Grounded
1
# 6
# 3
1 in. I.D.
1-1/4 in. I.D.
Grounding
1
# 8
# 6
Ungrounded
2
# 1
# 2/0
150 Amps Grounded
1
# 2
# 1/0
1-1/4 in. I.D.
1-1/2 in. I.D.
Grounding
1
# 6
# 4
Ungrounded
2
# 2/0
# 4/0
200 Amps Grounded
1
# 1/0
# 2/0
1-1/2 in. I.D.
2 in. I.D.
Grounding
1
# 6
# 4
Ungrounded
2
# 3/0
250 MCM
225 Amps Grounded
1
# 2/0
# 4/0
2 in. I.D.
2 in. I.D.
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.
Page 3 of 10
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 NonMetal 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.
Page 4 of 10
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
Liquidtight Flexible Nonmetallic Conduit
Rigid Metal Conduit
12 in. 12 in. 3 ft.
54 in. 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.
Page 5 of 10
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
Page 6 of 10
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
Page 7 of 10
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
Page 8 of 10
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