[Title 24 CFR 3280.804]
[Code of Federal Regulations (annual edition) - May 1, 2001 Edition]
[Title 24 - HOUSING AND URBAN DEVELOPMENT]
[Subtitle B - Regulations Relating to Housing and Urban Development]
[Chapter Xx - OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING]
[Part 3280 - MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS]
[Subpart I - Electrical Systems]
[Sec. 3280.804 - Disconnecting means and branch-circuit protective equipment.]
[From the U.S. Government Printing Office]
24HOUSING AND URBAN DEVELOPMENT52001-05-012001-05-01falseDisconnecting means and branch-circuit protective equipment.3280.804Sec. 3280.804HOUSING AND URBAN DEVELOPMENTRegulations Relating to Housing and Urban DevelopmentOFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSINGMANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDSElectrical Systems
Sec. 3280.804 Disconnecting means and branch-circuit protective equipment.
(a) The branch-circuit equipment shall be permitted to be combined
with the disconnecting means as a single assembly. Such a combination
shall be permitted to be designated as a distribution panelboard. If a
fused distribution panelboard is used, the maximum fuse size of the
mains shall be plainly marked with lettering at least \1/4\-inch high
and visible when fuses are changed. See section 110-22 of the National
Electrical Code (NFPA No. 70-1993) concerning identification of each
disconnecting means and each service, feeder, or branch circuit at the
point where it originated and the type marking needed.
(b) Plug fuses and fuseholders shall be tamper-resistant, Type
``S,'' enclosed in dead-front fuse panelboards. Electrical distribution
panels containing circuit breakers shall also be dead-front type.
(c) Disconnecting means. A single disconnecting means shall be
provided in each manufactured home consisting of a circuit breaker, or a
switch and fuses and their accessories installed in a readily accessible
location near the point of entrance of the supply cord or conductors
into the manufactured home. The main circuit breakers or fuses shall be
plainly marked ``Main.'' This equipment shall contain a solderless type
of grounding connector or bar for the purposes of grounding with
sufficient terminals for all grounding conductors. The neutral bar
termination of the grounded circuit conductors shall be insulated.
(d) The disconnecting equipment shall have a rating suitable for the
connected load. The distribution equipment, either circuit breaker or
fused type, shall be located a minimum of 24 inches from the bottom of
such equipment to the floor level of the manufactured home.
(e) A distribution panelboard employing a main circuit breaker shall
be rated 50 amperes and employ a 2-pole circuit breaker rated 40 amperes
for a 40-ampere supply cord, or 50 amperes for a 50-ampere supply cord.
A distribution panelboard employing a disconnect switch and fuses shall
be rated 60 amperes and shall employ a single 2-pole, 60-ampere
fuseholder with 40- or 50-ampere main fuses for 40- or 50-ampere supply
cords, respectively. The outside of the distribution panelboard shall be
plainly marked with the fuse size.
(f) The distribution panelboard shall not be located in a bathroom,
or in any other inaccessible location, but shall be permitted just
inside a closet entry if the location is such that a clear space of 6
inches to easily ignitable materials is maintained in front of the
distribution panelboard, and the distribution panelboard door can be
extended to its full open position (at least 90 degrees). A clear
working space at least 30 inches wide and 30 inches in front of the
distribution panelboard shall be provided. This space shall extend from
floor to the top of the distribution panelboard.
[[Page 188]]
(g) Branch-circuit distribution equipment shall be installed in each
manufactured home and shall include overcurrent protection for each
branch circuit consisting of either circuit breakers or fuses.
(1) The branch circuit overcurrent devices shall be rated:
(i) Not more than the circuit conductors; and
(ii) Not more than 150 percent of the rating of a single appliance
rated 13.3 amperes or more which is supplied by an individual branch
circuit; but
(iii) Not more than the fuse size marked on the air conditioner or
other motor-operated appliance.
(h) A 15-ampere multiple receptacle shall be acceptable when
connected to a 20-ampere laundry circuit.
(i) When circuit breakers are provided for branch-circuit protection
240 circuits shall be protected by 2-pole common or companion trip, or
handle-tied paired circuit breakers.
(j) A 3 inch by 1-3/4 inch minimum size tag made of etched, metal-
stamped or embossed brass, stainless steel, anodized or alclad aluminum
not less than 0.020 inch thick, or other approval material (e.g., 0.005
inch plastic laminates) shall be permanently affixed on the outside
adjacent to the feeder assembly entrance and shall read: This connection
for 120/240 Volt, 3-Pole, 4-Wire, 60 Hertz, ________ Ampere Supply. The
correct ampere rating shall be marked on the blank space.
(k) When a home is provided with installed service equipment, a
single disconnecting means for disconnecting the branch circuit
conductors from the service entrance conductors shall be provided in
accordance with Part F of Article 230 of the National Electrical Code,
NFPA No. 70-1993. The disconnecting means shall be listed for use as
service equipment. The disconnecting means may be combined with the
disconnect required by Sec. 3280.804(c). The disconnecting means shall
be rated not more than the ampere supply or service capacity indicated
on the tag required by paragraph (l) of this section.
(l) When a home is provided with installed service equipment, the
electrical nameplate required by Sec. 3280.804(j) shall read: ``This
connection for 120/240 volt, 3 pole, 3 wire, 60 Hertz, ________ Ampere
Supply.'' The correct ampere rating shall be marked in the blank space.
[40 FR 58752, Dec. 18, 1975, as amended at 42 FR 961, Jan. 4, 1977.
Redesignated at 44 FR 20679, Apr. 6, 1979, as amended at 52 FR 4589,
Feb. 12, 1987; 58 FR 55019, Oct. 25, 1993]