California code of regulations




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§ 1180. Lot Electrical Service Equipment.

(a) Lot electrical service and its equipment for a new lot Equipment installed to supply electrical energy to an MH-unit shall be rated at not less than 100-amperes and shall be listed and labeled "Service Equipment", "Suitable for Use as Service Equipment" or “Suitable for Use as Service Equipment for Manufactured Homes or Mobilehomes". When installed in locations where the demand for a single lot exceeds 100-amperes, the MH-unit lot service equipment shall be capable of supplying the required demand. MH-unit lot service equipment shall be capable of supplying not less than the required demand to an MH-unit by the installation of a circuit breaker or fused disconnecting switch for connecting the MH-unit feeder assembly by a permanent wiring method. The rating of the overcurrent protection in the MH-unit lot service equipment shall not exceed the rating of the feeder assembly connected by a permanent wiring method. MH-unit lot service equipment may contain any or all of the approved receptacles conforming with to section 1186 of this chapter.

(b) The lot service equipment for existing lots need not be upgraded to comply with the minimum standards contained in subsection (a). However, lot service must meet the rated load of the existing, or proposed unit installed on the lot, including other attached loads.

(c) MH-unit lot service equipment may also contain a means for supplying accessory buildings or structures or building components or other electrical equipment located on the lot, provided the MH-unit lot service equipment is designed and listed for such application.

(c d) Only one power supply connection shall be made to a unit.

(d e) Lot service equipment may also contain additional receptacles for supplying portable electrical equipment, provided that such receptacles are listed grounding type receptacles. All 120-volt, single-phase, 15- and 20-ampere receptacle outlets in lot service equipment shall be protected by ground-fault circuit protection. The requirement for ground-fault circuit protection shall not apply to equipment or installations constructed, installed, or approved for construction or installation prior to September 1, l975.

(e f) When an electrical meter is installed as an integral component of the lot service equipment, it shall be of a class or rating that will accurately measure all loads up to the rated ampacity of the lot service equipment.

(f g) When the electrical meter-base equipment is to be attached to the MH-unit at the time of installation, an alteration permit for the unit is required pursuant to Section 18029 of the Health and Safety Code.

(g h) Parks constructed after January 1, 1997, shall have individual electric meters for each lot and shall be served by electrical distribution facilities owned, operated, and maintained by the electrical corporation as defined in section 218 of the Public Utilities Code providing electric service in the area, in accordance with Public Utilities Code section 2791.


NOTE: Authority cited: Section 18300 and 18605, Health and Safety Code. Reference: Sections 18550, 18605 and 18670, Health and Safety Code; Section 2791 Public Utilities Code.
§ 1211. LPG Tanks.

(a) LPG tank installations in parks must conform to the provisions related to LPG tanks contained in Chapter 38 of the California Fire Code, which is hereby incorporated by reference.

(b) MH-Units designed and constructed with securely mounted tanks, may be served by either the lot or mounted tanks, but not by both at the same time.

(c) A permit from the enforcement agency is required to install fuel tanks exceeding 60 U. S. gallons within a park.

(d) LPG tanks shall be designed and constructed in accordance with nationally recognized standards for unfired pressure vessels.

(e) LPG tanks shall be securely, but not permanently, fastened to prevent accidental overturning.

(f) All LPG tanks located in a floodplain as designated by the local floodplain management agency, shall be securely anchored to prevent flotation.
NOTE: Authority cited: Section 18300, Health and Safety Code. Reference: Section 18690, Health and Safety Code.
§ 1230. Required Gas Supply.

(a) The minimum hourly volume of gas required at each lot outlet, or any section of a park gas piping system shall be calculated as shown in Table 1230-1.

(b) Required gas supply for other fuel gas consuming appliances connected to the park gas piping system shall be calculated as provided in the California Plumbing Code, Chapter 12.

(c) The operator of a park shall be responsible for maintaining all gas piping installations and equipment under his or her ownership or control and maintaining the system in good operating condition.


TABLE 1230-1

Demand Factors for Use in Calculating Gas Piping Systems in Parks

Number of Lots

BTU Per Hours Per Lot

1

125,000

2

117,000

3

104,000

4

96,000

5

92,000

6

87,000

7

83,000

8

81,000

9

79,000

10

77,000

11-20

66,000

21-30

62,000

31-40

58,000

41-60

55,000

Over 60

50,000

NOTE: Authority cited: Section 18300, Health and Safety Code. Reference: Section 18690, Health and Safety Code.


§ 1333. Foundation Systems.

(a) Pursuant to Health and Safety Code section 18551, the requirements for MH-unit and commercial modular foundation systems are applicable throughout the state.

(b) The foundation system and the connection of the MH-unit or commercial modular to the foundation system shall be designed to withstand the vertical and lateral forces due to dead load, roof and floor live loads, wind and seismic loads in accordance with the provisions of the California Building Residential Code and local soil conditions. The roof live load, wind and seismic loads as established for permanent buildings within specific local areas shall apply.

(c) The vertical and lateral load resisting elements shall be sized and located to resist the loads specified in the manufacturer's installation instructions. The manufacturer's installation instructions shall become a part of the foundation system plans. In the absence of the manufacturer's installation instructions, plans and specifications signed by an architect or engineer covering the installation of an individual MH-unit or commercial modular shall be provided to the enforcement agency.

(d) The foundation system and the connection of the MH-unit or commercial modular to the foundation system shall be capable of withstanding the vertical and lateral loads shown in the manufacturer's installation instructions, or plans and specifications signed by an architect or engineer, including locations where there are concentrated loads.

(e) When an MH-unit or commercial modular is installed on a foundation system, a foundation system plan shall be provided to the enforcement agency. The manufacturer may provide a foundation system plan in its installation instructions, or a foundation system plan may accompany the installation instructions. Foundation systems may be approved by the enforcement agency or the department. Foundation systems approved by the department shall be accepted by every enforcement agency as approved for the purpose of obtaining a construction permit when the design loads and conditions are consistent for the locality. The department shall require that foundation system plans and supporting data be signed by an architect or engineer.

(f) Foundations for cabanas, porches, and stairways which are accessory to MH-units on foundation systems and foundations for building components shall be subject to approval of the enforcement agency. Porches and stairways which are accessory to commercial modulars on a foundation system shall be subject to approval of the enforcement agency.

(g) When it is necessary for the department to approve plans or to make investigations of complaints relating to foundation system plans, fees shall be paid in accordance with section 1020.9 of article 1.

(h) A standard plan approval may be obtained from the department for a plan for MH-unit or commercial modular foundation systems. The requirements for obtaining a standard plan approval are contained in section 1020.9 of article 1.

(i) Multifamily manufactured homes consisting of three (3) or more dwelling units shall be installed on a foundation system pursuant to Health and Safety Code section 18551(a) or (b).


NOTE: Authority cited: Sections 18300, Health and Safety Code. Reference: Sections 18551 and 18008.7, Health and Safety Code.
§ 1334. MH-unit Support Piers and Footings.

(a) Load bearing piers shall be constructed of rust resistant materials or treated to resist rust and designed and constructed in accordance with the design requirements of the California Building Code, Chapters 16, 19, 21, 22 and 23. The required load bearing capacity of individual support piers and their footings shall be calculated at not less than a combined live and dead load of seventy-five (75) psf, based on roof live and dead load of twenty-five (25) psf and floor live and dead load of fifty (50) psf of the MH-unit.

(b) Load bearing piers, other than concrete block piers, shall be tested to determine the safe operating load. The tests shall be conducted by testing agencies approved by the department. Testing agencies shall provide a pier testing report to the department upon completion, regardless of the testing results. A unique number provided by the testing agency shall identify each test report. The following testing procedures shall be used:

(1) A compression test shall be performed on three (3) piers of the same height and construction, selected randomly at the pier manufacturing facility by a representative of the testing agency.

(A) The compression test shall be performed on piers with all required design assemblies installed, such as adjustable tops, clamps, securement devices or similar assemblies.

(B) The selected piers shall be subjected to the compression test with each pier, fully assembled as will be installed, placed squarely on a firm base, and tested to its failure point. The compression test shall be measured in psf. Support pier failure will be established when the support bends, cracks, buckles or deflects to an unsafe level as determined by the approved testing agency.

(C) The safe operating load of a support pier is one-third (1/3) the average of the three (3) failure tests.

(2) When piers differ in height or construction, design tests and evaluations must be performed on each type of pier.

(c) Tested load bearing piers other than concrete block piers shall be listed and labeled as follows:

(1) Listing of piers shall be conducted by listing agencies approved by the department.

(A) The listing agency shall conduct manufacturer facility audits and prepare finding reports not less than once per year. The audit report will include, at a minimum:

(i) the review of pier construction for compliance with manufactured designs as approved by the testing agency,

(ii) the materials used in its construction including type, size, and weight,

(iii) the manufacturers quality control program, if applicable, and

(iv) the label application and label control process.

(B) The listing agency shall provide an annual report to the department of its approval and audit findings.

(2) Pier supports shall display a legible permanent label of approval, visible when the pier support is installed. The label shall contain the following information:

(A) Manufacturer’s name,

(B) Listing agency name,

(C) Listing number issued by the listing agency,

(D) Testing agency’s approved operating load, and

(E) Testing agency’s test report number.

(d) Individual load bearing footings may be placed on the surface of the ground, and shall be placed level on cleared, firm, undisturbed soil or compacted fill. Where unusual soil conditions exist, as determined by the enforcement agency, footings shall be designed to compensate for such conditions. The allowable loading on the soil shall not exceed one thousand five-hundred (1,000)(1,500) psf unless data to substantiate the use of higher values is approved by the enforcement agency.

(e) Footings shall be adequate in size to withstand the tributary live and dead loads of the MH-unit and any concentrated loads. The length to width ratio of the footing shall not exceed two and one-half (2.5) to one (1). Individual footings for load bearing supports or devices shall consist of one of the following:

(1) Pressure treated lumber which meets the following requirements:

(A) Not less than two (2) -inch nominal thickness with a minimum of twenty-five (25) percent of the individual footings identified by an approved listing agency, as being pressure treated for ground contact.

(B) Knots. Well spaced knots of any quality are permitted in sizes not to exceed the following or equivalent displacement:


Nom. Width

Any Location

Holes (Any Cause)

6"

2 3/8"

1 1/2"

One Hole or Equivalent Per Piece




8"

3"

2"

10"

3 3/4"

2 1/2"

12"

4 1/4"

3"

14"

4 5/8”

3 1/2"

(C) Splits. In no case exceed one-sixth (1/6) the length of the piece.

(D) Honeycomb or Peck. Limited to small spots or streaks of firm honeycomb or peck equivalent in size to holes listed in (B) above.

(2) Precast or poured in place concrete footings not less than three and one-half (31/2) inches in thickness. The concrete shall have a minimum twenty-eight (28)-day compressive strength of not less than two thousand five hundred (2500) psi.

(3) Other material, approved by the department, providing equivalent load bearing capacity and resistance to decay.

(f) Individual load bearing piers or devices and footings shall be designed and constructed with sufficient rigidity and bearing area to evenly distribute the loads carried over one-third (1/3) the area of the footings as measured from the center of the footing. When two (2) or more two (2) inch nominal wood pads placed side-by-side on the ground are used as a pier footing, a single wood cross pad must be installed on top of the ground contact pads at a ninety (90) degree angle so as to place the directional wood grains opposing to each other. The cross pad must be of a length to cover each ground contact pad and be of two (2) inch nominal thickness. Footings shall be constructed of sufficient rigidity to evenly distribute the loads carried to the ground without bowing or splitting.

(g) When multiple wood footings are stacked, they shall be secured together with corrosion resistant fasteners at all four (4) corners of the pad which will penetrate at least eighty (80) percent of the base pad to prevent shifting.

(h) Individual load bearing piers, which do not include the footing as defined in section 1002 of this chapter, located under the MH-unit’s chassis shall not exceed thirty-six (36) inches in height. (i) When more then one-fourth (1/4) of the area of the MH-unit is supported at a height of three (3) feet or more as measured between each unit’s chassis and the ground, the MH-unit shall be installed on a foundation system in accordance with section 18551 (a) or (b) of the Health and Safety Code.

(j) No portion of the support system above the ground shall extend beyond the vertical plane of the side or end wall of the MH-unit that would restrict or inhibit installation of skirting.
NOTE: Authority cited: Sections 18300 and 18613, Health and Safety Code. Reference: Sections 18300 and 18613, Health and Safety Code.
§ 1334.2. Mechanical Connection of Concrete Block Piers.

While nothing in this section requires the installation of an MH-unit to include the mechanical connection of concrete block piers, the following standards have been developed for the mechanical connection of a concrete block pier to an MH-unit and to the pier's footing.

(a) When live loads are applied to an MH-unit installed pursuant to Health and Safety Code section 18613, mechanical connection of concrete block piers shall be capable of maintaining the placement of the support system of the MH-unit to the point of the failure of either the attachment point on the MH-unit, the pier or the footing.

(1) The means of mechanical connection shall not allow the separation of the MH-unit from any pier or footing as a result of horizontal loads or vertical loads,

(2) Failure occurs when the attachment point on the MH-unit, the pier or the footing yields or fractures or is deformed to a point that threatens the health and safety of the occupants of the MH-unit.

(b) For the purposes of this section, live loads are restricted to the following:

(1) horizontal loads applied to the attachment point on the MH-unit in both directions parallel to the attachment point and in both directions perpendicular to the attachment point; and

(2) vertical loads applied to the attachment point on the MH-unit in both directions upward and downward from the point of contact between the pier footing and the ground.

(c) In order to test a device, assembly or arrangement designed to achieve mechanical connection of a concrete block pier to an MH-unit and to the pier's footing, the testing shall comply with the methods and specifications provided in this section, and the mechanical connection shall endure the testing without failure.

(d) The device, assembly or arrangement of mechanical connection of concrete block supports shall be tested in both of the following configurations:

(1) eight (8) inches by eight (8) inches by sixteen (16) inches concrete blocks shall be stacked three (3) blocks high, without wooden spacers between the blocks, upon a pressure-treated wood footing

two (2) inches by twelve (12) inches by thirty (30) inches in size.

(2) eight (8) inches by eight (8) inches by sixteen (16) inches concrete blocks shall be stacked three (3) blocks high, with one (1) -inch wooden spacers between the concrete blocks, upon a pressure-treated wood footing two (2) inches by twelve (12) by thirty (30) inches in size.

(3) The concrete blocks used in the configurations shall comply with the requirements and reference standards contained in of UBC Standard 21-4, "Hollow and Solid Load-Bearing Concrete Masonry Units," the California Building Code.

(e) A section of three (3)-inch flange by ten (10)-inch web steel "I" beam shall be used to simulate the point of attachment to the MH-unit.

(f) Two (2)-piece wooden wedges, driven together in opposition to one another and forming a thickness of not less than one (1) inch or more than two (2) inches between the topmost concrete block and the "I" beam, shall be used to simulate the typical surface bearing area between the concrete block pier support and the point of attachment to the MH-unit.

(g) The device, assembly or arrangement proposed as a means of mechanical connection for concrete block supports shall be installed in each of the configurations specified in subsection (d) and shall be subjected to the following procedures.

(1)(A) The footing shall be placed upon a level surface capable of supporting not less than one thousand five-hundred pounds (1000)(1,500) psf.

(B) The contact points between the wooden wedges and the "I" beam and between the concrete block and the footing shall be clearly marked.

(C) The "I" beam shall be raised vertically at least twelve (12) inches not less than five (5) times, without failure of the mechanical connection.

(D) Failure occurs if the points of contact of either the wooden wedges and the "I" beam or the concrete block and the footing has changed more than one (1) inch from the locations originally marked, as instructed in subsection (g)(1)(B).

(2)(A) The "I" beam shall be subjected to a constant vertical load of not less than one thousand five-hundred (1000)(1,500) psf at a point central to the concrete block pier configuration. The measurement between the level support surface and the bottom of the "I" beam shall be recorded.

(B) While maintaining the vertical load, the "I" beam shall be subjected to horizontal loads applied in both directions parallel to the "I" beam and in both directions perpendicular to the "I" beam. The mechanical connection shall withstand these forces without failure, until one or more of the concrete blocks fail to support the vertical load.

(C) Failure of one or more of the concrete blocks to support the vertical load occurs when the measurement recorded as directed in subsection (g)(2)(A) between the support surface and the bottom of the "I" beam, is decreased by one or more inches.

(D) Failure of the mechanical connection occurs if the points of contact of either the wooden wedges and the "I" beam or the concrete block and the footing have changed more than one (1) inch from the locations originally marked as instructed in subsection (g)(1)(B).
NOTE: Authority: Sections 18300, 18613, and 18613.4, Health and Safety Code. Reference: Section 18613.4, Health and Safety Code.

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