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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations 3280.802

of the exhaust duct system is not required when the following apply:

28. In 3280.709, revise paragraph a to read as follows:

3280.709

Definitions.

Installation of appliances.

a The installation of each appliance must conform to the terms of its listing and the manufacturers instructions.
The manufactured home manufacturer must leave the appliance manufacturers instructions attached to the appliance.
Every appliance must be secured in place to avoid displacement. For the purpose of servicing and replacement, each appliance must be both accessible and removable.
1 A direct vent space heating appliance is permitted to be shipped loose for on-site installation in a basement provided the following:
i The heating appliance is listed for the installation.
ii Approved installation instructions are provided that include requirements for completion of all gas and electrical connections and provide for the manufacturers inspection and/or testing of all connections.
iii Approved instructions are provided to assure connection of the vent and combustion air systems in accordance with 3280.710b, and to provide for the manufacturers inspection of the systems for compliance.
iv Approved installation and the manufacturers inspection procedures are provided for the connection of the site-installed heating appliance to the factory-installed circulation air system and return air systems.
2 The procedures must include revisions to assure compliance of the installed systems with 3280.715.

29. In 3280.710, revise paragraph d to read as follows:

a
4 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 structurally supported by the manufactured home.

b Reserved 31. In 3280.807, add paragraph g to read as follows:

3280.807

Fixtures and appliances.

g In bathrooms, ceiling-mounted lighting fixtures and wall-mounted lighting fixtures must not be controlled by the same switch.
32. In 3280.810, revise paragraph b to read as follows:

3280.810

Electrical testing.

b Additional testing. Each manufactured home must be subjected to the following tests:
1 An electrical continuity test to assure that metallic parts are effectively bonded;
2 An operational test of all devices and utilization equipment, except water heaters, electric ranges, electric furnaces, dishwashers, clothes washers/
dryers, and portable appliances, to demonstrate they are connected and in working order; and 3 Electrical polarity checks to determine that connections have been made in accordance with applicable provisions of these standards and Article 550.17 of NFPA 702005
incorporated by reference, see 3280.4. Visual verification is an acceptable electrical polarity check.
3280.902

Amended
33. In 3280.902b, remove an A
frame and add in its place a rigid substructure.
34. Revise 3280.903 to read as follows:

3280.710 Venting, ventilation, and combustion air.

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d Venting systems of fuel-burning appliances must terminate at least three feet above any motor-driven air intake discharging into habitable rooms when located within ten feet of the air intake.

30. Amend 3280.802 by:
a. Redesignating paragraphs a4
through 41 as paragraphs a5
through 42;
b. Adding a new paragraph a4; and c. Adding and reserving paragraph b.
The additions read as follows:

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3280.903 General requirements for designing the structure to withstand transportation shock and vibration.

a General. The manufactured home and its transportation system as defined in 3280.902f must withstand the effects of highway movement such that the home is capable of being transported safely and installed as a habitable structure. Structural, plumbing, mechanical, and electrical systems must be designed to function after set-up. The
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home must remain weather protected during the transportation sequence to prevent internal damage.
b Testing or analysis requirements.
Suitability of the transportation system and home structure to withstand the effects of transportation must be permitted to be determined by testing, or engineering analysis, or a combination of the two as required by paragraphs b1 and 2 of this section.
1 Road tests. Tests must be witnessed by an independent registered professional engineer or architect, manufacturers IPIA or DAPIA, or by a recognized testing organization. Such testing procedures must be part of the manufacturers approved design.
2 Engineering analysis. Engineering analysis methods based on the principles of mechanics and/or structural engineering may be used to substantiate the adequacy of the transportation system to withstand intransit loading conditions. As transportation loadings are typically critical in the longitudinal direction, analysis should, in particular, provide emphasis on design of longitudinal structural components of the manufactured home e.g., main chassis girder beams, sidewalls, and rim joists, etc.. Notwithstanding, all structural elements necessary to the structural integrity of the manufactured home during in-transit loading are also to be evaluated e.g., transverse chassis members and floor framing members, etc..
iA The summation of the design loads in paragraphs b2iA1
through 3 of this section may be used to determine the adequacy of the chassis in conjunction with the manufactured home structure to resist in-transit loading:
1 Dead load, the vertical load due to the weight of all structural and nonstructural components of the manufactured home at the time of shipment.
2 Floor load, a minimum of 3
pounds per square foot.
3 Dynamic loading factor, 0.25b2iA + b2iB.
B However, the in-transit design loading need not exceed twice the dead load of the manufactured home.
ii To determine the adequacy of individual longitudinal structural components to resist the in-transit design loading, a load distribution based on the relative flexural rigidity and shear stiffness of each component may be utilized. For the purpose of loading distribution, the sidewall may be considered to be acting as a deep beam in conjunction with other load carrying elements in determining the
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