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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations The brake wire must not be less than the value specified in the brake manufacturers instructions. Aluminum wire, when used, must be provided with suitable termination that is protected against corrosion.
10 Lamps and associated wiring.
Stop lamps, turn signal/lamps, and associated wiring must meet the appropriate sections of FMVSS No. 108
in 49 CFR 571.108, which specify the performance and location of these lamps and their wiring. The manufacturer may meet these requirements by utilizing a temporary light/wiring harness, which has components that meet the FMVSS
No. 108. The temporary harness is permitted to be provided by the manufactured home transportation carrier.
36. Add subpart K to read as follows:
Subpart KAttached Manufactured Homes and Special Construction Considerations Sec.
3280.1001 Scope.
3280.1002 Definitions.
3280.1003 Attached manufactured home unit separation.
3280.1004 Exterior walls.
3280.1005 Electrical service.
3280.1006 Water service.
3280.1001

Scope.

This subpart covers the requirements for attached manufactured homes and other related construction associated with manufactured homes not addressed elsewhere within this part.
3280.1002

Definitions.

The following definitions are applicable to this subpart only:
Attached manufactured home. Two or more adjacent manufactured homes that are structurally independent from foundation to roof and with open space on at least two sides, but which have the appearance of a physical connection i.e., zero lot line.
Fire separation wall. An adjoining wall of a manufactured home that separates attached manufactured homes with a fire separation distance of less than three feet.

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3280.1003 Attached manufactured home unit separation.

a Separation requirements. 1
Attached manufactured homes shall be separated from each other by a fire separation wall of not less than 1-hour fire-resistive rating with exposure from both sides on each attached manufactured home unit when rated based on tests in accordance with ASTM E11905 incorporated by reference, see 3280.4.

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2 Fire-resistance-rated floor/ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing.
b Fire separation penetrations. 1
Fire rated fire separation walls must not contain through penetrations or openings.
2 Membrane penetrations for electrical boxes are permitted on the living side of the wall under the following conditions:
i Steel electrical boxes not exceeding 16 square inches may be installed provided that the total area of such boxes does not exceed 100 square inches in any 100 square feet wall area.
Steel electrical boxes in adjacent fire separation walls must be separated by a horizontal distance of not less than 24
inches.
ii Listed 2-hour fire-resistant nonmetallic electrical boxes are installed in accordance with the listings.
iii No other membrane penetrations are allowed.
c Continuity of walls. The fire separation walls for single-family attached dwelling units must be continuous from the foundation to the underside of the roof sheathing, deck, or slab and must extend the full length of the fire separation walls.
d Parapets. 1 Parapets constructed in accordance with paragraph d2 of this section must be provided for attached manufactured homes as an extension of fire separation walls in accordance with the following:
i Where roof surfaces adjacent to the fire separation walls are at the same elevation, the parapet must extend not less than 30 inches above the roof surfaces.
ii Where roof surfaces adjacent to the wall or walls are at different elevations and the higher roof is not more than 30 inches above the lower roof surface, the parapet must not extend less than 30 inches above the lower roof surface.
A Parapets must be provided unless roofs are of a Class C roof covering and the roof decking or sheathing is of noncombustible materials or approved fire-retardant-treated wood for a distance of four feet on each side of the common fire separation walls; or one layer of 58 inch Type X gypsum board or equivalent is installed directly beneath the roof decking or sheathing for a distance of four feet on each side of the fire separation walls.
B A parapet must not be required where roof surfaces adjacent to the common walls are at different elevations and the higher roof is more than 30

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inches above the lower roof. The fire separation wall construction from the lower roof to the underside of the higher roof deck must not have less than a 1hour fire-resistive rating. The wall must be rated for exposure from both sides.
2 Parapets must have the same fire resistance rating as that required for the supporting wall or walls. On any side adjacent to a roof surface, the parapet must have noncombustible faces for the uppermost 18 inches, to include counter flashing and coping materials. Where the roof slopes toward a parapet at slopes greater than 212 16.7 percent slope, the parapet must extend to the same height as any portion of the roof within a distance of three feet, but in no case will the height be less than 30
inches.
3280.1004

Exterior walls.

a The requirements of 3280.504 for condensation control and vapor retarder installation are required to be provided on each fire separation wall of each attached manufactured home.
b The requirements of 3280.506 for heat loss/gain insulation apply to the fire separation wall on each attached manufactured home.
3280.1005

Electrical service.

a Each attached manufactured home must be supplied by only one service.
b Service conductors supplying one manufactured home must not pass through the interior of another manufactured home.
3280.1006

Water service.

a Each manufactured home must have an individual water supply that will service only that unit.
b Each manufactured home must have a hot water supply system that will service only that unit.
PART 3282MANUFACTURED HOME
PROCEDURAL AND ENFORCEMENT
REGULATIONS
37. The authority citation for part 3282 is revised to read as follows:

Authority: 15 U.S.C. 2697, 28 U.S.C. 2461
note, 42 U.S.C. 3535d, 5403, and 5424.

38. In 3282.7, redesignate paragraphs d through nn as e through oo and add new paragraph d to read as follows:

3282.7

Definitions.

d Attached accessory building or structure means any awning, cabana, deck, ramada, storage cabinet, carport, windbreak, garage, or porch for which the attachment of such is designed by the home manufacturer to be
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