the provisions of the applicable
requirements contained in the California Code of Regulations, Title 25, Chapter 2, Article 7
relative to the installation of manufactured homes and mobilehomes.

For the purposes of this guide, the definition of MH-unit also means mobilehome or
manufactured home. A MH-unit must be installed in accordance with the provisions of Article
7 and the manufacturers installation instructions. Should the manufacturers installation
instructions not be available, this guide contains specific requirements for support
and connection of multi-unit homes.

A Permit to Construct must be obtained before the installation or occupancy of a MH-unit.
This is important, as the MH-unit must be placed in accordance with the approved plot plan,
setback and separation requirements and flood plain ordinance certification, when applicable.

Inspections shall be requested at least 2 business days in advance of the time the installation
is expected to be completed. The applicant must provide the on-site test equipment required
by Section 1362 of the regulations. This equipment must include a continuity tester and a
polarity tester for testing the electrical components. Also required is an air pressure or slope
gauge or manometer for testing the gas system at low pressure (6 to 8 oz. or 10 to 14 inches
of water column). The MH-unit must be connected to the water system so the water and
drain systems can be checked for leaks.

At the time of inspection, skirting shall not be installed and all exterior doorways shall
be provided with a porch, ramp, and/or stairway conforming to the provisions of the
California Code of Regulations, Chapter 2, Article 7.

It may be helpful to refer to the MH-unit Inspection Worksheet (see page 19) for a list of the
basic installation requirements.














2
TABLE OF CONTENTS










PAGE


INTRODUCTION






1

I. APPLICATION








Definitions







4


Regulations
and
Website
Information
7



Plot Plan








8



Plot
Plan
Instruction
Sheet
9


II.

LOT PREPARATION

Lot
Grading
10

Lot Fill








10

Frost
Line
10

Uneven
Surfaces
10


Vapor
Barriers 11

III. MH-UNIT
SUPPORTS

Steel Piers







12

Concrete
Masonry
Supports 12

Load
Distribution
12

Height
Limitations
and
Clearances 13

Footings
14

Installation
Instructions
14

Support
Span
Tables 15

IV. MULTI-UNIT
CONNECTIONS

Roof








16



Floor








16



End Wall








17

3

V.


ENGINEERED
TIEDOWN
SYSTEM


ETS
and
certification 18

VI.
MH-UNIT
INSPECTION
WORKSHEET
19

VII.
UTILITY CONNECTIONS AND TESTING

Water
Connection
20

Gas
Connection
20

Sewer
Connection
20

Electrical
Connection 20

Required
Tests
21
&
22



































4

DEFINITIONS

The following definitions apply to this Installation Guide

Approved Reviewed and/or inspected and deemed acceptable to the enforcement agency
having jurisdiction.

Branch Water Service Line - That portion of the water distribution system extending from
the park water main to a lot, including connections, devices and appurtenances.

Certificate of Occupancy - A document issued by the enforcement agency when an MH-
unit or commercial modular, installed on a foundation system, is approved for occupancy by
the enforcement agency.

Cited Person - A person or entity issued a notice of violation for a violation of the regulations
or applicable laws who is responsible for its correction.

Concrete Block Pier - An assembly of load-bearing, concrete blocks with wooden wedges
used to support and level a unit.

Concrete Pier - A concrete load-bearing support that incorporates into its structure an
adjustable means of raising and leveling the unit.

Department - The Department of Housing and Community Development.

Drain Connector - The extension, from the units or accessory buildings or structures drain
outlet, to the lots drain inlet.

Drain Outlet - The discharge end of the units or accessory buildings or structures, sewage
drainage system.

Electrical Feeder Assembly - The overhead or underchassis feeder conductors, including
the equipment grounding conductor, together with the necessary fittings and equipment,
designed for the purpose of delivering energy from the lot electrical service equipment to the
branch circuit distribution panelboard of the unit or accessory building or structure.

Electrical Service, Park - The conductors and equipment for delivering electrical energy
from the electrical supply system or the generator of an isolated plant, to the electrical wiring
system of the park.

Energize - The act of applying electrical energy, or gas or water pressure.

Enforcement Agency - The Department of Housing and Community Development, or any
city, county, or city and county that has assumed responsibility for the enforcement of the
Mobilehome Parks Act and the Special Occupancy Parks Act pursuant to sections 18300 and
18865 of the Health and Safety Code.

Equipment - All materials, appliances, devices, fixtures, fittings, or accessories used in the
structural, fire safety, plumbing, mechanical, and electrical systems of units, accessory
buildings and structures, buildings, structures, infrastructures, and systems subject to the
Mobilehome Parks Act and the Special Occupancy Parks Act.
5
Feeder - The conductors for conveying electrical energy between any two points in the parks
electrical wiring system, excluding electrical feeder assemblies.

Footing - The portion of a support, in direct contact with the ground, that distributes imposed
loads to the soil.

Gas Connector - A flexible connector, listed for exterior use, to convey gas from a gas riser
outlet to the gas supply connection of a unit.

Gas Riser Outlet - That portion of a park gas service lateral or gas piping system, extending
above ground, serving a lot.

Gas Service Lateral - The pipe or that portion of a park gas piping system extending from
the main park gas line to the individual gas riser outlet serving a lot.

Ground Anchor - That part of a tiedown assembly that is inserted into the ground.

Listed - All equipment, materials, products, and installations included in a list published by
an approved listing agency.

Load - Any of the forces that a structure is designed to withstand, including any permanent
force such as the weight of a roof, known as a dead load; any moving or temporary force,
such as the weight of occupants, known as a live load; wind loads imposed by wind activity;
and seismic loads imposed by seismic activity.

Lot Electrical Service Equipment, Park - That equipment containing the means to connect
or disconnect overcurrent protective devices and receptacles, or other means for supplying a
unit, listed appliance, accessory building or structure, or building component from the parks
electrical supply.

Lot Water Service Outlet, Park - That portion of the parks water distribution system,
including equipment and devices, provided with a fitting for connecting a unit's water
connector.

MH-unit - A term, as used in this chapter, to replace references to mobilehome,
manufactured home, and multi-unit manufactured housing.

Mobilehome/Manufactured Home Installation Acceptance Certificate - A document
issued by the enforcement agency when an MH-unit is approved for occupancy by the
enforcement agency pursuant to Health and Safety Code section 18613 or 18551(b).

Occupant - For the purposes of the Mobilehome Parks Act and the Special Occupancy
Parks Act, means a person who lawfully occupies a unit on a lot.

Occupied Area - The total of all the space occupied by a unit, including eave overhangs and
projections; building components; and all accessory buildings or structures on a lot.

Owner - The person or entity that legally owns or possesses an item, property, or business
through title, lease, registration or other legal document.

Park - For purposes of the Mobilehome Parks Act and the Special Occupancy Parks Act, is
any manufactured housing community or mobilehome park.
6

Pier - A vertical support constructed of concrete, steel, or concrete block for the transmission
of loads from a unit, accessory building or structure, or building component, to a footing. A
pier does not include the footing.

Power Supply Cord - A flexible cord assembly of conductors, including a grounding
conductor, connectors, attachment plug cap, and all other fittings, grommets, or devices,
designed for the purpose of delivering electrical energy from the parks lot electrical service
equipment to the branch circuit distribution panelboard of the unit.

Sewage Drain Lateral - That portion of the park sewage syst