199 R E P O R T O F C O M M I T T E E O N M O B I L E H O M E S MH-1

Report of Committee-on

Mobile Homes and Recreational Vehicles

C o r r e l a t i n g C o m m i t t e e o n M o b i l e H o m e s a n d R e c r e a t i o n a l V e h i c l e s (All Members Serve in Personal Capacity)

L loyd W. G a r n e r , Chairman, Georgia State Firemen's Association, Inc.

730 Church Street, Decatur, GA 30030

George H. T r y o n , Administratiw Secretary (Nonvoting) National Fire Protection Association

470 Atlantic Avenue, Boston, MA 02210

Delevan J. Arno ld , Vesely Company Russe l l R. Bahr , California Department of

Housing & Community Development (Chairman, Sectional Committee on Mobile Homes)

A. O. Ba rke r . Electrical Safety Bureau, State of Idaho

C. E. Blome, American Association of Re- tired Persons

W a l t e r N. Burke , Veterans Administration Wi l l i am E. Dell, Mobile Home and Recre-

ational Vehicle Section, Department of Labor and Industries, State of Washington

E d w a r d J . Dwyer , E. J. Dwyer Company H. W i l l i a m Ewt~, Utica Mutual Insurance

Company (Chairman, Sectional Committee on Recreational Vehicle Parks)

J a m e s G. Gross , National Bureau of Standards

J o r d a n H e l m a n , American Societ~ of Heating t Refrigerating and Air Condition- ing Ensmecrs, Inc .

K e n n e t h C. Henke , J r . , Division of Mu- nicipal Affairs, Office of Planning and Programming, State of Iowa

J o h n D. Hosey, Foremost Insurance Com- pany (Chairman, Sectional Committee on Mobile Home Parks)

W a l t e r H. J o h n s o n , National LP*Gas As- sociation (Chairman, Sectional Committee on Recreational Vehicles)

D u a n e E. Kep l inge r , Federal Housing Ad- ministration, U. S. Department of Housing & Urban Development

N o r m a n J . L a t t e r , International Associa- tion of Plumbing & Mechanical Officials

W. J . S m i t h , Underwriters' Laboratories, Inc.

C. Pe te Van Z a n d t . Sierra Craft

Ph i l i p R. W a n r o y , Kampgrounds of America

V i n c e n t J . Wanzek , Fleetwood Enter- prises, Inc.

N o n v o t i n g

F r a n c i s IS. Green lea f . Trailer Coach As- Ph i l i p N. S h r a k e , Recreation Vehicle In- sociation dustry Association

H e n r y O m s o n , Mobile Homes Manufac- turers Aesociation

200 MH -2 S E C T I O N A L C O M M I T T E E

S e c t i o n a l C o m m i t t e e o n M o b i l e H o m e P a r k s

J o h n D. Hosey, Chairman Foremost Insurance Company

1145 San Jose Drive, SE, Grand Rapids, MI 49506

Francis E. Greenleaf , Secretary (Nonvoting) Trailer Coach Association

3855 East LaPalma Ave., Anaheim, CA 92806

Ted Baiter, Texas Mobile Home Association A. O. Barker, International Association of

Electrical Inspectors & N. E. C. Richard H. Bast, Fire Marshals Association

of North America Herbe r t W. Behrend, American Society of

Civil Engineers C. E. Blome, American Association of Re-

tired Persons Edward L. Colleton, Trailer Coach As-

sociation T o m Collins, Southeastern Manufactured

Housing Institute, Inc. J a n e K a t h r y n Conrad, American Mobile

Home Assnsiation/Mobile Home Life Edward J. Dwyer, American Society of Me-

chanical Engineers T o m S. Gable, National Sanitation Foun-

dation Lloyd W. Garne r , Georgia State Firemen's

Association, Inc. H a n s R. Grigo, National Safety Council S. R. H a r m a n , Mobile Home & Recreational

Vehicle Division, State of Utah Jo rdan H e i m a n , American Society of Heat-

ing, Refrigerating and Air Conditioning Engineers, Inc.

D. E. Hughes , American Gas Association Wal te r H. Johnson , National LP-Gas As-

sociation Char les W. Lane, Communities Inter-

national N o r m a n J. La t t e r , International Associa-

tion of Plumbing & Mechanical Officials Richard C. Mitchel l , Mobile Homes Manu-

facturers Association S a m u e l J. Morano, American Society of

Sanitary Engineering Wil l iam T. Nebraska, American Insurance"

Association E. J. Or th , Jr . , Electric Light & Power

Group Mary S. Picket t , Illuminating Engineering

Society K e n n e t h D. Rhoton , Gold Seal, Division

of ETL, Inc. M. W. S m i t h m a n , National Association of

Home Builders Paul L. Solomon, Department of Housing

and Community Development, State o~ California

Ted L. Strasser , Nebraska Mobile Housing Institute, Inc.

Al te rna tes

S. L. B l a c h m a n , American Gas Association (Alternate to D. E. Hughes)

Ra lph A. Brewster , American Insurance Association (Alternate to William T. Nebraska)

H. K. Glenn , Electric Light & Power Group (Alternate to E. J. Orth, Jr.)

J o h n F leming , National Safety Council (Alternate to Hans R. Grigo)

Nicholas A. LaCourte , American Society of Heating, Refrigerating and Air Con- ditioning Engineers, Inc. (Alternate to Jordan Helman)

Nell MacLean , International Association of Plumbing & Mechanical Officials (Alternate to Norman J. Latter)

Ga ry W. Sher law, National Sanitation Foundation (Alternate to Tom S. Gable)

C. J. S o m m e r s , National Association of Home Builders (Alternate to M. W. Smithman)

Nonvot ing

Walter N. Burke, Veterans Administration Wllford I. S u m m e r s , National Fire Pro- Clarence E. Cuyler , U. S. Department of tection Association

Health, Education & Welfare ]Donald R. F a l r m a n , Federal Housing Ad- George H. Tryon , National Fire Protection

ministration, U. S. Department of Housing Association and Urban Development Brian Weir, Canadian Standards Asso-

Eric Ken t , Canadian Standards Association clarion

R E P O R T OF C O M M I T T E E ON M O B I L E HOME%.'

201 MH-3

S e c t i o n a l C o m m i t t e e o n R e c r e a t i o n a l V e h i c l e P a r k s

H. Wil l iam Ewig, Chairman American Mutual Insurance Alliance

Utica Mutual Insurance Co., P.O. Box 530, Utica, NY 13503

Phil ip N. Shrake, Secrstury (Nonvoting) Recreation Vehicle Industry Association

2720 Des Plaines Ave., Des Plainss, IL 60018

LeRoy V. Abbot t , MarketDyne Interna- tional Incorporated

A. O. Barker, International Association of Electrical Inspectors & N. E. C.

Herbe r t W. Behrend, American Society of Civil Engineers

Doug Betts, Trailer Coach Association C. E. Blorne, American Association of Re-

tired Persons Francis M. Bowaman, National Rural Elec-

trical Cooperative Association J o h n F leming , National Safety Council T o m S. Gable, National Sanitation Founda-

tion Lloyd W. Garne r , Georgia State Firemen's

Association, Inc. Howard L. Glasky, Trailer Coach Asso-

ciation H. K. Glenn , Electric Light & Power Group Verne R. Groendal , American Gas Asso-

ciation J o r d a n H e l m a n , American Society of Heat-

ing, Refrigerating and Air Conditioning Engineers, Inc.

J o h n D. Hussy, Foremost Insurance Com- pany

Wal te r H. Johnson , National LP-Gas As- sociation

Eugene L. Ki lbourn , Recreation Vehicle Industry Association

N o r m a n J. La t t e r , International Associa- tion of Plumbing & Mechanical Officials

S a m u e l J. Morano, American So~ety of Sanitary Engineering

L. W. Moses, Recreational Vehicle Industry Association

Wil l iam T. Nebraska, American Insurance Association

Marvin E. Nerern, Recreation Vehicle In- dLLqtry Association

K e n n e t h D. Rhoton , Gold Seal, Division of ETL, Inc.

Paul L. Solomon, Department of Housing and Community Development, State of California

Fred D. Tldwell, National Park Service, U. S. Department of the Interior

Rober t E. T u r n e r , Howard Johnson Co. Phil ip R. Wanroy, Kampgrounds of

America Rene H. Yerke, Underwriters' Laboratories,

Inc.

Alternates S. L. B l a c h m a n , American Gas Association

(Alternate to Verne R. Groendal)

Ra lph A. Brewster , American Insurance Association (Alternate to William T. Nebraska)

H a a s R. Grlgo, National Safety Council (Alternate to John Fleming)

Nicholas A. LaCour te , American Societ 7 of Heating, Refrigerating and Air Condi- tioning Engineers, Inc. (Alternate to Jordan Heiman)

Nell MacLean, International Association of Plumbing & Mechanical Officials (Alter- nate to Norman J. Latter)

E. J. Or th , Jr . , Electric Light & Power Group (Alternate to H. K. Glenn)

'Gary W. Sher law, National Sanitation Foundation (Alternate to Tom S. Gable)

W. J. S m i t h , Underwriters' Laboratories, Inc. (Alternate to Rene H. Yerke)

Vines Wanzek, Recreational Vehicle In- dns Association (Alternate to Doug Bet~

Nonvot ing

Rober t D. Buechner , National Recreation Wiiford I. S u m m e r s , National Fire Pro- and Park Association tection Association

Clarence E. Cuyler , U. S. Department of George H. Tryon , National Fire Protection Health, Education & Welfare Association

Eric Kent , Canadian IBtandards Association Brian Weir, Canadian Standards Association

This list rsprssent~ the membership at the time the Committee was balloted on the text of this edition. ~ince that time, changss in the ms~nbeyship may hays occurred.

202 M H - 4 VOTE STATEMENT

The Report of the Committee on Mobile Homes and Recre- ational Vehicles is in threepar ts . Parts I and I I are reports from the Sectional Committee on Mobile Home Parks. Part I I I is a report f rom the Sectional Committee on Recreational Vehicle Parks. Each of these Sectional Committees report to the Asso- ciation and to the American National Standards Institute through the Committee on Mobile Homes and Recreational Vehicles. The parts are further explained as follows:

P a r t I contains proposed additions and revisions to the Standard for Mobile Home Parks (NFPA No. 501A-1974; ANSI Al19.3-1975) not relating to mobile home stabilizing devices.

P a r t I I contains proposed additions and revisions to the Standard for Mobile Home Parks (NFPA No. 501A-1974; ANSI Al19.3-1975) relating to mobile home stabilizing device's. Part I I is being proc- essed, as this report is written (February 1975), for approval as Tentative Inter im Amendment to the existing referenced text. I t is being processed herewith through the normal Technical Com- mittee Procedures in compliance with Paragraph 103 of the NFPA Regulations Governing Technical Committees.

P a r t H I contains proposed additions and revisions to the Standard for Recreational Vehicle Parks (NFPA No. 501D-1974; ANSI Al19.4- 1975).

V o t e S t a t e m e n t

Correlating Committee on Mobile Homes and Recreational Vehicles

On Par t I 0f the Committee's Report covering the proposed revisions to the Standard .for Mobile Home Parks (NFPA No. 501A-197d; ANSI Al19.3--1975) relating to other than mobile home stabilizing devices, o.f the 20 voting members of the Correlating Committee, 18 have voted af- firmatively, none negatively, 1 has asked to be recorded as not voting (Mr. Latter), and I member has not returned his ballot (Mr. Dwyer).

On Par t I I of the Committee's Report covering the proposed revisions to the Standard for Mobile Home Parks (NFPA No. 501A-1974; ANSI Al19.3-1975) relating to mobile home stabilizing devices, oJ the 20 voting members of the Correlating Committee, 17 have voted affirmatively, 1 negatively (Mr. Bahr), 1 has asked to be recorded as not voting (Mr. Latter), and I member has not returned his ballot (Mr. Dwyer).

On Par t I I I of the Committee's Report covering proposed revisions to the Standard for Recreational Vehicle Parks (NFPA No. 501D-1974; ANSI Al19.4-1975), oj: the 20 voting members of the Correlating Com- mittee, 78 have voted affirmatively, and 2 negatively (Messrs. D. J. Arnold and R. R. Bahr).

203 REPORT OF COMMITTEE ON MOBILE HOMES MH-5

Vote Statement

Sect ional C o m m i t t e e o n Mobi l e H o m e P a r k s

On Part I of the Committee's Report relating to other than mobile home stabilizing devices, of the 28 voting members of the Sectional Com- mittee, 24 have voted affrmatively, 7 wishes to be recorded as not voting (Mr. Latter), and 3 ballots have not been returned to date (Messrs. Dwyer, Morano, and Smithman).

On Part II of the Committee's Report relating to mobile home stabilizing devices, of the 28 voting members of the Sectional Committee, 21 have voted affrmatively, 1 negatively (Mr. Solomon), 3 wish to be recorded as not voting (Messrs. Gable, Grigo, and Latter), and 3 ballots have not been re- turned to date (Messrs. Dwyer, Morano, and Smithman).

Vote Statement

Sect ional C o m m i t t e e o n Recrea t iona l Veh ic l e P a r k s

On Part III of the Committee's Report relating to revisions to the Standard .for Recreational Vehicle Parks, of the 28 voting members of the Sectional Committee, 25 members have voted affrmatively, 1 negatively (Mr. Solomon) and 2 members have not returned the# ballots to date (Mr. Fleming and Mr. Kilbourne). Mr. Orth balloted for Mr. Glenn, the latter having recently retired as a representative of the Electric Light and Power Group.

204 REVISIONS TO NFPA 501A 501A-1

Part I of the Repor t of the

Committee on Mobile Homes and

Recreational Vehicles

1 9 7 5 Proposed Revisions to the Standard for

Mobile Home Parks

NFPA No. 501A-1974 (ANSI A I I 9 . 3 - 1 9 7 5 ) Other than Those RQlating to

Mobile Home Stabilizing Devices

7. Part 7, Paragraph 7. 7.7. Revise to read:

7.1.1 General Requirements, An accessible, adequate, Safe and potable supply of water shall be provided in each mobile home park. The water supply t reatment shall provide water of a quali ty which shall meet the chemical and bacteriological requirements of the health authori ty having jurisdiction but in no case shall the water quali ty be less than that to be specified under the provisions of the Safe Drinking Water Act of 1974 (Public Law 93-523 dated December 16, 1974).* Where a public supply of water of satis- factory quanti ty, quality, and pressure is available at or within the boundary of the park site, connect ion shall be made thereto and its supply used exclusively. When a satisfactory public water supply is not available, a private water supply system shall be developed.

2. Part 7, Paragraph 7.7.5.6. Revise to read:

7.1.5.6 Each mobile home shall be connected to the park water service outlet by a flexible connector, such as copper tubing, not less than the size of the mobile home water supply inlet.

3. Part 1 O, Paragraph 70. 7.7. Add to the existing text new second and third sentences ~lus a new "Note," the revised text to read:

*Available from the U. S. Government Printing Office, Washington, D. C. 20402. This Act calls for the Environmental Protection Agency to develop National Primary Drinking Water Regulations within 18 months after date of promulgation. Pending availability of these Regulations, those of the local health authority should be enforced.

501A-2 REPORT OF COMMITTEE ON MOBILE HOMES

205

lO.l . l Park Location and Arrangement. The location and arrangement of each mobile home park shall meet the approval of the chief of the fire depar tment responsible for providing the necessary fire protection services. Where there could be possible time response delays for emergency equipment (fire, police, or ambulance services) occasioned by a single access to a mobile home park (such as might be caused by railroad crossings, limited access highways, one-way streets, grades which can become impassable under snow or icing conditions), a second access or emergency access roadway should be provided wherever possible. A site plan shall be supplied to the fire and law enforcement agencies having jurisdiction.

N O T E : Such a "site plan" shall show the numerical designation or street n a m e a n d number of each mobile home lot in the park.

4. Part 10, Paragraph 10.5.5. Revise this text to read:

10.5.5 Procedures in Case of Fire. In case of fire in a mobile home, the householder should take the following steps in the se- quence shown: (1) get all occupants out of the mobile home; (2) call the fire department or sound the alarm; and (3) assist re- sponding fire department personnel to the location of the fire.

5. Part 10, Paragraph 10.5.11 (new). And the following new text:

10.5.11 Each mobile home lot should be marked for identifica- tion. Such a marker should be easily readable from the park street serving the lot.

206 I

R E V I S I O N S TO N F P A 501A 5 0 1 A - 3

L

Part II of , the Report of the .

Commi t tee on Mob i le Homes a n d

Recreat ional Vehicles

Proposed Additions and Revisions to the Standard for .

L

Mobi le H o m e Parks

NFPA No. 501A-1974 (ANSI A119.3-1975) .Relating to . ,

Mobile Home Stabilizing Devices

Change the title oaf the standard to:

S t a n d a r d fo r t h e I n s t a l l a t i o n o f M o b i l e H o m e s I n c l u d i n g M o b i l e H o m e P a r k R e q u i r e m e n t s

2. Paragraph 1.1. Add the following "Note" to this paragraph to call attention to the application indicated therein reflecting the change in the title the standard (see Item 1):

N O T E : C e r t a i n p rov i s ions of this s t a n d a r d m a y also be a p p l i e d to the installation of mobile homes regardless of whether or not they are located in a mobile home park. Particular attention is called to the provisions applic- able to stabilizing devices and anchoring systems which are applicable to any mobile home installation (see particularly the applicable definitions in Part 2 and Sections 4.2, 4.3, 4.4, 4.5, d.6, and 4.7, plus Appendix A). Other pertinent references applicable to mobile home installations not in parks include: 4.1, most of Part 5, 7.1, 7.2.3, 8.4, 9.1.3, 9.1 •5-9.1.8, 9.2.3, 10.1.2, 10.1.7, 10.4.2, 10.5.5, and 10.5.7-10.5.9.

501A ~-4 REPORT OF COMMITTEE ON MOBILE HOMES

207

3. Part 2 Definitions. Delete the present definitions for Diagonal Tie, Ground Anchor, and Tiedown, and add the. following definitions in ap- propriate .sequence:

Anchoring Equipment. Straps, cables, turnbuckles, and chains, including tensioning devices, which are used with ties to secure a mobile home to ground anchors.

Anchoring System. A combination of ties, anchoring equip- ment, and ground anchors that will, when properly designed and installed, resist overturning and lateral movement of the mobile home from wind forces.

Baling. Baling is a method of "wrapping" a cross section (roof, walls, and floor) and the main frame (chassis)of a mobile home with straps.

Diagonal 'Tie. A tie intended to primarily resist horizontal or shear forces and which may s~condarily resist vertical, uplift, and overturning forces.

Footer. That portion of the support system that transmits loads dire~ztly to the soil.

Ground Anchor. Any device at the mobile home stand de- signed to transfer mobile :home anchoring loads to the ground.

Hurricane Resistive Mobile Home" A mobile home which meets tke wind design load requirements of Section 6.3.2 of the Standard for Mobile Homes (NFPA No. 501B-1974; ANSI Al19.1).

Main Frame. The structural component on which is mounted the body of the mobile home.

Pier. That portion of the support system between the footer and the mobile home exclusive of caps and shims.

Stabiliz/ng Devices" .All components of the anchoring and sup- port systems such as piers, footers, ties, anchoring equipment, ground anchors and any other equipment which supports the mobile home and secures it to the ground.

Support System. A combination of footers, piers, caps, and shims-that will, when properly installed, support the mobile home.

Tie. Strap, cable Or securing device used to connect the mobile home to ground anchors.

Vertical Tie. A tie intended to primarily resist the iaplifting and overturning forces.

208 REVISIONS TO NFPA 5 0 1 A 501A-5

4. Part 4. Delete the present text of Paragraphs 4.2 Stabilizing Devices or Piers, 4.3 Ground Anchors, 4.4 Placement of Ground Anchors, and 4.5 Diagonal Ties and insert the following in its place:

4.2 Stabilizing Devices. -Each mobile home, upon being in- stalled on a mobile home stand, shall have stabilizing devices as specified herein, except that the authority having jurisdiction may • not require compliance with the provisions on anchoring systems where low design wind velocities do not justify such systems.

4.2.1 Manufacturer's Installation Instructions. Each mobile home shall have its support a n d anchoring systems installed in accordance with the mobile home manufacturer 's installation in- structions. These instructions shall be left within the mobile home following installation.

. 4.2.1.1 Footers shall be sized to support the loads shown in these instructions.

4.2.1.2 Stabilizing devices not provided with the mobile home shall be of the design and capacity and shall be installed in ac- cordance with the specifications of the mobile home manufacturer and this standard.

4.Z2:. Stabil izing System Design. ,Mobile homes not provided with manufacturer's, instructions for stabilizing devices and their installation for the zone in'which the mobi lehome is to be installed shall be provided with anchoring ~and support systems designed by a registered professional engineer or architect or shall comply with the following requirements i .

4.2.2.1 Number, Spacing, and Location of Anchoring Ties. (a) Number oJ Ties. The minimum number of ties per side for

various lengths o f mobile homes-in hurricane and. nonhurricane 'zones shall be in accordance with Table 4.2.2.1(a).

(b) Spacing of Ties. Ties shall be as evenly spaced as practicable along the !ength of the mobile home with not more than 8 feet open-end spacing on each end.

(c) Location of Ties. When continuous straps are provided as vertical ties¢ such ties shall be positioned at ra f te rs and studs. .Where a vertical tie and diagonal ,tie are located at the same~place, both ties may be connected to a single ground anchor, provided that the anchor used is capable of carrying both loadings.

(d) Special Ties. Clerestory roofs and add-on sections of ex- pandable mobile homes shall have provisions for "vertical ties at the exposed ends. ' :

T a b l e 4.2.2.1 (a)

N u m b e r o f T i e s R e q u i r e d P e r S i d e o f S i n g l e W i d e I M o b i l e H o m e s ~

Thi s t ab le is based on a m i n i m u m w o r k i n g load pe r a n c h o r of 3,150 p o u n d s w i t h a 50 p e r c e n t over - load (4,725 p o u n d s to ta l ) .

Length of 8 Mobile Home

(Feet)

32-40 41-46 47-49 50-54 55-58 59--64 65-70 71-73 74-84

2 3 4 5

Hurricane Resistive

Alternate Method 4

No. of No. of No. of No. of Vertical Diagonal Baling Diagonal

Ties Ties 5 Straps Ties e

5 6 6 7 7 8 9 9 10

6 7 8 9

2 2 2 3 3 3 3 3 4

Nonhurricane Resistive

Alternate Method 4

4 4 5 5 5 6 6 7 7

2 2 2 3 3 3 3 3 4

XDouble-wide mobile homes require only the diagonal ties specified in column 3 side walls.

No. of No. of No. of No. of Vertical Diagonal Baling Diagonal

Ties Ties 6 Straps Ties e

3 2 3 2 3 2 3 2 4 2 4 2 4 2 4 2 5 2

3 3 3 3 4 4 5 5 " 5

or 7, and these shall be placed along the outer

2Except when the anchoring system is designed and approved by a registered professional engineer or architect. aLength of mobile home (as used in this Table) means length excluding draw bar. ~Alternate Method. When this method is used, an approved reinforcement means shall be provided. If baling is used to accomplish this reinforcement, the provisions of Paragraph 4.2.2.3 shall apply. 6Diagonal ties in this method shall deviate at least 40 ° from a vertical direction. 6Diagonal ties in this method shall deviate 45 ° 4- 5 ° from vertical.

I

IO

O g.

o

210 REVISIONS TO NFPA 501A 501A-7

4.2.2.2 Protection of Ties and Mobile Home Roofing and Siding. Protection shall be provided at sharp corners where the anchoring system requires the use of external cables or straps. Protection shall also be provided to minimize damage to roofing or siding by the cable or strap.

4.2.2.3 Alternate Method Using Strapping. I f the alternate method incorporating baling straps specified in Table 4.2.2.1(a) is used, the baling straps shall be wrapped completely around the mobile home passing under the main steel frame, with both ends of each strap fastened together under tension. The straps shall be in accordance with Section 4.4. The method used to connect the ends of the strap shall not reduce the allowable working load and overload.

4.3 Support Systems. Each mobile home shall have a support system as specified herein. A minimum clearance of 12 inches should be maintained beneath the underside of the main frame ( I -beam or channel beam) in the area of utility connections.

4.3.1 Mobile Homes with Installation Instructions. Indi- vidual footers and load-bearing piers or listed supports shall be sized and located to support the loads specified in the manufac- turer's installation instructions to assure that the manufacturer 's warranty remains valid.

4.3.2 Mobile Homes for Which Installation Instructions Are Not Available. Unless the entire support system is designed by a registered professional engineer or architect, supports shall be spaced not more than 10 feet apart for mobile homes 12 feet wide or less, and not more than 8 feet apart for mobile homes over 12 feet wide, beginning from the front wall of the mobile home, with not more than 2 feet open-end spacing at the area of the main frame. Supports shall be installed directly under the main frame (or chassis) of the mobile home. Methods other than those specified herein may be approved by the authority having jurisdiction.

4.3.3 Footers. The required load-bearing capacity of individual load-bearing supports and their footers shall be calculated at not less than a combined live and dead load of 55 PSF for the Middle Zone or 65 PSF for the North and Hurricane Zones. Footers shall be adequate in size to withstand the tributary live and dead loads of the mobile home and any concentrated loads.

501A-8 R E P O R T OF C O M M I T T E E ON M O B I L E H O M E S

211

4.3.3.1 Footers shall be at least 16-inch by 16-inch by 4-inch solid concrete blocks or other product approved for the use intended. As an alternate, two 8-inch by 16-inch by 4-inch solid concrete blocks can be used as footers provided the joint between the blocks is parallel to the steel I -beam frame.

4.3.3.2 Footers or pier foundations, when required, shall be placed level on firm undisturbed soil or on controlled fill which is free of grass and organic materials, compacted to a minimum load-bearing capacity of 2000 PSF (unless otherwise approved by a registered professional engineer).

4.3.4 Piers. Piers or load-bearing supports or devices shall be designed and constructed to evenly distribute the loads. Piers shall be securely attached to the frame of the mobile home or shall extend at least 6 inches from the centerline of the frame member. Manufactured load-bearing supports or devices shall be listed or approved for the use intended, or piers shall be constructed as follows:

4.3.4.1 Piers less than 40 inches in height shall be constructed of open or closed cell, 8-inch by 8-inch by 16-inch concrete blocks (with open cells vertically placed upon the footer). Single-stacked block piers shall be installed with the 16-inch dimension perpen- dicular to the main (I-beam) frame. The piers shall be covered with a 2-inch by 8qnch by 16-inch wood or concrete cap. (See Figure 4.3.4.1 in the Appendix.)

4.3.4.2 Piers between 40 and 80 inches in height and all corner piers over three blocks high shall be double blocked with blocks interlocked and capped with a 4-inch by 16-inch by 16-inch solid concrete block, or equivalent. (See Figure 4.3.4.2 in the Appendix.)

4.3.4.3 Piers over 80 inches in height shall be constructed as per 4.3.4.2 and they shall be laid in concrete mortar and steel re- inforcing bars inserted in block cells with the block cells filled with concrete. (See Figures 4.3.4.3 (a) and (b) in the Appendix.)

4.3.5 Elevated Mobi le Homes. When more than one-fourth of the area of a mobile home is installed so that the bottom of the main frame members a re more than 3 feet above ground level, the mo- bile home shall be installed with an approved anchoring and support system.

4.3.6 Plates and Shims. A cushion of wood plate not exceeding 2 inches in thickness and shims not exceeding 1 inch in thickness

212 R E V I S I O N S TO N F P A 501A 501A-9

may be used to fill any gap between the top of the pier and the mare frame. Two-inch or 4-inch solid concrete blocks may be used to fill the remainder of any gap. Shims shall be at least 4 inches wide and 6 inches long and shall be fitted and driven tight between the wood plate or pier and main frame.

4.4 Anchoring Equipment . Anchoring equipment , when in- stalled, shall be capable of, resisting an allowable working load equal to or exceeding 3,150 pounds and shall be capable of with- standing a 50 percent overload (4,725 pounds total) without failure of either the anchoring equipment or the attachment point on the mobile home.

4.4.1 Resistance to Weather Deterioration. Anchoring equip- ment exposed to weathering shall have a resistance to weather deterioration at least equivalent to that provided by a coating of zinc on steel of not less than 0.30 ounces per square foot of surface coated.

NOTE 1 : Slit or cut edges of zinc-coated steel strapping do not need to be zinc coated.

NOTE 2: Type 1, Class B, Grade 1 steel strapping, 1¼ inches wide and 0.035 inch thick, conforming with Federal Specification QQ-S-781G,

• is judged to conform with Paragraph 4.4.1.

4.4.2 Pe rmanency of Connections. Anchoring equipment shall be designed to prevent self-disconnection when ties are slack. Hook ends shall not be used in any part of the anchoring system.

4.4.3 Tensioning Device Design. Tensioning devices such as turnbuckles or yoke-type fasteners shall be ended with clevis or forged or welded eyes.

4.4.4 Ties. Cable or strapping or other approved methods or materials shall be used for ties. All ties shall be fastened to g round anchors and drawn tight with turnbuckles, yoke-type fasteners or other such tensioning devices or devices listed with the ground anchor.

4.4.4.1 Tie materials shall be capable of resisting an allowable working load of 3,150 pounds with no more than 2 percent elonga- tion and shall withstand a 50 percent overload (4,725 pounds total). Ties shall comply with the weathering requirements of Paragraph 4.4.1.

• 4.4.4.2 Ties shall connect the ground anchor and the main structural steel frame (I-beam or other shape) which runs length-

501A-10 REPORT OF COMMITTEE ON MOBILE HOMES

213

wise under the mobile home. Ties shall not connect to steel out- rigger beams which fasten to and intersect the main structural frame unless specifically stated in the manufacturer 's installation instructions.

4.4.4.3- Connection of the cable frame tie to the mobile home I -beam or equivalent main structural frame member shall be by a ~ - i n c h drop forged closed eye bolt through a hole drilled in the center of the I -beam web or other approved methods. The web shall be reinforced if necessary to maintain the I -beam strength.

4.4.4.4 Cable ends shall be secured with at least two. U-bolt type cable clamps to insure strength at least equal to that required by 4.4.4.1.

4.5 Ground Anchors. Ground anchors, including means for attaching ties, shall be located to effectively match the anchoring system instructions provided by the mobile home manufacturer, or, if there are no instructions, in accordance with the requirements of Section 4.2 herein, and shall be designed and installed to transfer the anchoring loads to the ground.

4.5.1 Capaci ty of Anchors. Each ground anchor, when in- stalled, shall be capable of resisting an allowable working load at least equal to 3,150 pounds in the direction of the tie plus a 50 per- cent overload (4,725 pounds total) without failure. Failure shall be considered to have occurred when the point of connection between the tie and anchor moves more than 2 inches at 4,725 pounds in the direction of the vertical tie when the anchoring equipment is installed in accordance with the manufacturer 's instructions. Those ground anchors which are designed to be installed so that the loads on the anchor are other than direct withdrawal shall be designed and installed to resist an applied design load of 3,150 pounds at 45 ° from horizontal without displacing the a n c h o r more than 4 inches horizontally at the point where the tie attaches to the anchor. Anchors designed for connection of multiple ties shall be capable of resisting the combined working load a n d overload consistent with the intent expressed herein.

4.5.2 Anchor Design and Installation. Each manufactured ground anchor shall be listed and installed in accordance with the terms of its listing and the anchor manufacturer 's instructions and shall include means of at tachment of ties meeting the requirements of 4.4.4. Ground anchor manufacturer 's instructions shall include the amount of preload required and the methods of adjustment after installation.

214 REVISIONS TO NFPA 501A 501A-11

4.5.2.1 Each g r o u n d anchor shall have the manufac ture r ' s identif ication and listed model identif ication number marked thereon so that the n u m b e r is visible after installation. Instructions shall accompany each listed ground anchor specifying the types of soil for which the anchor is suitable under the requi rements of 4.5.1.

NOTE: The following data gives information relative to soil types with blow counts and torque values:

T y p e s o f Softs

Blow Test Count P r o b e 1 ( A S T M T o r q u e D1586) V a l u e s

Sound hard rock . . . . . . . . . . . . . . . . NA NA

Very-dense and/or cemented sands, coarse gravel and more than cobbles, prcloadcd silts, days, and corals . . . . . . 40-up 550

lbs. inch

Medium-dense coarse sands, sandy gravels, very-stiff 350-549 silts and clays . . . . . . . . . . . . . . . . . 24--39 lbs. inch

:_<L(x~e to medium dense sands, firm to stiff clays and 200 to 349 silts, aluvian fill . . . . . . . . . . . . . . . . . 14-23 a lbs. inch

1The test probe is a device for measuring the torque value of softs to assist in evaluating the holding capability of the soils in which the anchor is placed. The test probe has a helix on it. The overall length of the helical section is 10.75 inches; the major diameter is 1.25 inches; the minor diameter is 0.81 inches; the pitch is 1.75 inches. The shaft must be of suitable length for anchor depth.

~A measure synonymous with moment of a force when distributed around the shaft of the test probe.

~Below these value, a professional engineer sould be consulted.

4.5.3 U s e of Concrete Slabs or Cont inuous Footings. If con- crete slabs or. cont inuous footers are used to transfer the anchor ing loads to the ground, the fol lowing shall be required.

• 4.5.3.1 Steel rods cast in concrete shall be capable of resisting loads as specified in 4.5.1.

4.5.3.2 D e a d m a n anchors may be used in place of listed anchors if t hey meet the requi rements of Pa rag raph 4.5.1. T h e y shall be constructed of solid concrete at least six inches in d iamete r and two

501A-12 R E P O R T O F C O M M I T T E E ON M O B I L E H O M E S

215

feet long and reinforced with two # 4 steel rods and shall be in- stalled at least five feet below the surface of the ground.

4.5.3.3 Concrete slabs may be used in place of ground anchors provided the slab is so constructed that it provides holding strength equal to the requirements of Paragraph 4.5.1.

4.5.4 Other Anchor ing Devices. Other anchoring devices meeting the requirements of this section shall be permitted if ac- ceptable to the authority having jurisdiction.

4.6 Anchor Installation.

4.6.1 Specifications for Anchors. Each type anchor suitable for this purpose shall have specification data showing the soil classi- fication(s) for which it qualifies.

4.6.2 Selection of Anchors. Anchor selection shall be based on a determination of the soil class at the depth the anchor helical plate will be instklled.

4.6.3 Dep th of Anchors. All anchors shall be installed to the full depth shown in the anchor manufacturer 's installation instruc- tions.

4.7 Main ta in ing Anchor ing Systems. Tie tension should be checked and adjusted when necessary to prevent damage to the mobile home from settling or other unforeseen movements (such as frost heave).

4.7.1 Frost Heave . Frost heave can have an adverse effect on the mobile home through displacement of the mobile home anchoring and blocking systems. I f a mobile home is located in an area subjected to frost heave, one of the following additional steps should be considered:

(a) Periodic maintenance should be achieved by the home owner through adjustment of tiedown tension to insure that tension does not build up because of earth movement, or,

(b) Footers and the load-carrying portion of the ground anchors should extend below the frost line, or

(c) The mobile home should be placed on a reinforced concrete pad as specified in 4.5.3.3.

5. Appendix A, Figure A-l, Load Zone Map oJ U.S.A. Delete this Figure. Add to Appendix A the following new Figures 4.3.4.1, 4.3.4.2, 4.3.4.3 (a) and (b):

NOTE: In areas subject to frost heave, see Section 4.7.

Less than 40" in height

f / l-beam frame . - '

t ~ l r J ~ ~ ~ Gapbetweentopofp[erandma[nframemaybeawoodptate{not J l . exceeding 2" in thickness) and shims (not exceeding 1 " in thickness).

• r ' - " 1 ~ Shims shall be at least 4 " wide and 6 " long, f i t ted and dr iven t ight I between wood plate or pier and main frame. Two inch or 4 " solid

" ~ - ~ ~ concrete b lock may f i l l remainder of any gap.

Cap - wood or concrete, 2 " x 8" x 16"

", Open or closed cell concrete blocks 8 " x 16 " (open cells placed 8,~ , ~ vert ical ly upon footer) installed w i th 16" dimension perpendicular

, to the I-beam f r a m e . .

Footer -- 16 " x 16" x 4 " solid concrete or other product approved for the purpose or, al ternately, two 8 " x 16" x 4 " solid concrete

J / b l o c k s w i th jo in t between blocks parallel to the.steel l-beam frame.

4-'------- Ground level

Footer placed on f irm undisturbed soil or on contro l led f i l l free of ' grass and organic materials compacted to a min imum load-bearing capacity of 2000 PSF.

Figure 4.3.4.1 For piers less than 40 inches in height (except corner piers over 3 blocks high). Piers shall be securely attached to the frame of the mobile home or sha l l ex tend at least 6 inches from the centerline of the frame member.

0

~J~

0 Z "0 ;>

0

>

• N O T E : In a r ea s sub jec t tO frost heave , see Sec t ion 4.7.

, I-beam frame

Gap between top of pier and main frame maybe a wood plate (not exceeding 2" in thickness) and shims (not exceeding 1" in thickness). Shims shall be at least 4 " wide and 6 " long, f i t ted and driven tight between wood plate or pier and main frame. Two inch or 4 " solid concrete block may fi l l remainder of any gap.

Cap -- Solid concrete block or equivalent 4" x 16" x 16"

Between 40" and 80" in height

Double concrete blocks (solid or celled) wi th blocks interlocked and capped as specifiedabove.

Footer - 16" x 16" x 4 " solid concrete or other product approved .for the purpose or, alternately, two 8 " x 16" x 4 " solid concrete ~ / ~ ' f blocks wi th jo int between blocks parallel to the steel I-beam frame.

~ Ground level

Footer placed on f i rm undisturbed soil or on control led fi l l free of grass and organic materials compacted to a min imum load-bearing capacity of 2000 PSF.

Figure 4.3.4.2 For piers 40 inches to 80h inches in height and all corner piers over 3 blocks hi h. Piers shag be securely attached to the frame of the mobile ome or shag extend at least 6 inches from the cente:~ine of the frame member.

~n t - t

k-,

O Z

O

t~

O

t ~ l int

NOTE: in areas subject to frost heave, see Section 4.7. ~ . _ J

t . ~ r ~ ~ _ . ~ . . . . . . ~ . ~ l-beam frame

' / ' "" Gap between top of pier and main frame may be a wood plate (not ' r J L ~ . r exceeding 2,, in thickness) and shims (not exceeding 1,, in thickness)"

= ~ Shims shall be at least 4" wide and 6" long, fitted and driven tight 1 ~ ~ "1~} i~! | between wood plate orpier and main frame. Two inch or 4" solid "- [?"='.:::"":~"'~':'=::"."~"~'~'~'.='1 L concrete block may fill remainder of any gap.

!!!ii!! ~] ~ Cap -- Solid concrete block or equivalent 4" x, 1 6 " x 16"

~ 1 Reinforcingrods(normally3/8"diametersteelrodsplacedinthe 80~erin / pier corners, four per pier)

height ~ ~, Double concrete blocks with any block cells filled with concrete, / ~ = laid in concrete mortar with steel reinforcing bars inserted in the

r ~ ~ ? ~ ! J Footer or pier foundation 24" x 24" x 6" solid concrete or other ~ / p r o d u c t approved for the purpose.

[ : - I ve,

Footer placed on firm undisturbed soil or on controlled fill free of grass and organic materials compacted to a minimum load-bearing capacity of 2000 PSF.

Figure 4.3.4.3 (a) For piers exceeding 80 inches in height . Piers shall be securely a t tached to the frame of the mobile " home or shall extend at least 6 inches from the center l lne of the f rame member .

;O

O 0~

O

¢.n

t

I=..= O0

501A-16 REPORT. OF COMMITTEE ON MOBILE HOMES

219

Concrete~ I ~ Steel Grouting ~ ~

Reinforcing Bars

Figure 4.3.4.3 (b) For piers exceeding 80 inches in height the concrete blocks must be filled w~th concrete grouting and steel reinforcing rods

utilized.

220 REVISIONS TO NFPA 5 0 1 D 501D-1

Part lU of the Report of the

Committee on Mobile Homes and

Recreational Vehicles

Proposed 1975 Revisions to the Standard for

Recreational Vehicle Parks

NFPA No. 5010-1974; Proposed ANSI Al19.4-1974

1. Par. 1-3. Revise to read:

1-3 Applicability. This standard has been developed to serve as the basis for regulations by local authorities to cover the con- struction of new recreational vehicle parks, additions to existing parks, and the use of land areas designated for such use. Existing recreational vehicle parks not in compliance with this standard may be continued in use provided such use does not constitute a recognized health or safety hazard.

2. Par. 2-6. Revise the definition to read:

2-6 Recreational Vehicle Park: A plot of land upon which two or more recreational vehicle sites are located, established or main- tained for occupancy by recreational vehicles of the general public as temporary living quarters for recreation or vacation purposes. Recreational vehicle parks are often designated as "campgrounds."

3. Par. 2-7. Revise the definition to read:

2-7 Recreational Vehicle Site: A plot'of ground within a recre- ational vehicle park intended for the accommodation of a recrea- tional vehicle on a temporary basis.

4. Par. 3-3. 2. Revise to read:

3/-3.2 Roads. Minimum widths of recreational vehicle park roads designed to accommodate all types and sizes of recreational vehicles shall be 10 feet per traffic lane or parallel parking lane.

5 0 1 D - 2 R E P O R T O F C O M M I T T E E O N M O B I L E H O M E S

221

5. Par. 3-3. 2, 2. Revise to read:

3-3.2.2 Road curves designed for use by all types and sizes of recreational vehicles shall have a minimum internal radius of 60 feet.

6. Par. 3-3.2.3. Revise to read:

3-3.2.3 Turnarounds shall ibe provided for all dead-end roads over 100 feet in length, and those designed for use by all types and sizes of recreational vehicles shall have a minimum in- ternal radius of 60 feet.

7~ Par. 3-3.3. Revise to read:

3-3.3 Playground Equipment. When provided, playground equipment covered by a standard of the Consumer Product Safety Commission shall comply with same.

8. Par. 3-5.3. Revise the allowable grade.from 2 inches to 3 inches, the revised text to read:

3-5.3 Each recreational vehicle stand shall be "graded to pro- vide drainage but shall not. exceed 3 inches per 10 feet across the width of the stand.

9. Section 3-6. Insert the following new section:

3-6 Special Recreational Vehicle Stand Grouped Utility Connection Assembly.

NOTE: See Sections 4-1.9 and 4-3.3, and 6-5, respectively, for separate po- table water supply connections, sewer inlet connections and electrical

• power supply .outlets at individual recreational vehicle stands.

3-6,1 When provided, and if acceptable to the authority :having jurisdiction, the.potable water supply connection, sewer in-

' let connection, and electrical power supply outlets for an individual • recreational vehicle stand may be grouped together in one as-

sembly under the following conditions:

3-6.1.1 The assembly shall be located within 1 foot of a point on the road (left) side of the recreational vehicle when parked on the stand, 9 feet from the longitudinal center line of the stand and 10 feet from the rear of the stand.

3-6.1.2 The assembly shall be listed specifically for the purpose of providing such services to individual recreational ve- hicles.

222 ' R E V I S I O N S TO NFPA 501D 501D-3

3-6.1.3 The assembly shall be provided with a separate, nonthreaded water outlet incorporating an antisiphon backflow prevention device, located above the sewer inlet and not more than 18 inches above grade level. This outlet shall 'have a weat.her' resistant instruction plate reading: " D A N G E R : DO N O T D R I N K WATER F R O M T H I S OUTLET. THIS WATER FOR FLUSH- ING AND CLEANING PURPOSES ONLY." . The ' warning message shall be in red letters at least ~ i n c h high.printed on a metallic or white background.'

l t" , ' i

N O T E : T h i s ou t l e t is spec i f ica l ly a n d o n l y for the p u r p o s e of r i n s ing the , s e w e r was te hose a n d t h e s e w e r i n l e t connec t ion . -

3-6.1,4 Electrical power supply outlets shall be located on a side of the assembly other than the side containing, the sewer inlet connection.

3-6.1.5 The assembly shall also be provided with a potable water outlet connection located on the side of the assembly di- rectly opposite the sewer inlet connection and rinsing outlet (3-6.1.3). The potable water outlet shall be a't least 12 inches but not more than 18 inches above grade level and shall incorporate an antisipho'n backflow prevention device. The outlet spigot shall be located or protected within .the assembly so that the sewer waste hose cannot be directly flushed from the spigot. ~

3-6.1.6 The water supply line to the assembly shall be con- tinuous (no connections) below grade level within a minimum of 10 feet from any underground sewer connection.

70. Par. 4-7.4(c). Revise to read:

(c) A minimum of 50 gallons per day per site if water-flush closets are provided in rest rooms.

77. Par. 4-7-9, 4-7.9.7, and 4-:7.9.2. Revise to read:

4-1.9 Potable Water Connections at Individual R e c r e - ational Vehic le Stands.

4-1.9.1 When provided, the water connections for potable water to individual recreational vehicle stands shall be located within 1 foot of a point on the road (left) side of the recreational vehicle when parked on the stand, 9 feet from the longitudinal center line of the recreational 'vehicle stand and 20 feet from the rear of the stand.

NOTE: See Section 3-6 for Special Recreational Vehicle Stand Grouped Utility Connection Assembly and Figures A-1 and A-2 of Appendix A for diagrams of typical arrangements.

501D-~4 R E P O R T O F C O M M I T T E E O N M O B I L E H O M E S

223

4-1.9.2 Each potable water connection shall consist of a water riser pipe ~vhich shall be equipped with a threaded male spigot located at least 12 inches but not more than 18 inches above grade level for the at tachment of a standard water hose. This connection shall be equipped with an antisiphon backflow pre- vention device.

12. Par. 4-2.2.7. Revise to read:

4-2.2.1 Toilets and urinals shall be provided at one or more locations in every recreational vehicle park. They shall be con- venient of access and shall be located within a 500-foot radius from any recreational vehicle site not provided with an individual sewer connection.

13. Par. 4-2.3.1. Revise to read:

4-2.3.1 A minimum of one toilet shall be provided for each seven vehicle sites up to the first 28 recreational vehicle sites. For each addit ional 25 recreational vehicle sites not provided with sewer connections, an addit ional toilet shall be provided.

14. 4-2.4.7, 4-Zd.2 , 4-,2.4.3. Change editorially, the words "dressing compartments" and "shower compartments '"and "shower stalls" to "dressing areas" and "shower areas" in 4 -Z4 .1 and 4-2.4.3 and revised 4-2.4.2, the revised text to read:

4-2.4.1 Shower areas, if provided, shall be of the individual type, be screened from view, and be not less than 30 inches by 30 inches in area. Each shower area shall be designed to minimize the flow of water into the dressing area and shall be properly connected to the sewerage system by means of a t rapped inlet.

4-2.4.2 If showers are provided, a dressing area shall also be provided with a minimum floor area of 6.25 square feet per shower head and such dressing areas shall be equipped with a minimum of one clothing ho.ok and stool (or equivalent bench area) per shower head.

4-2.4.3 The floors of showers and dressing areas shall have an impervious skid resistant surface. Wooden racks (duck boards) over shower floors are not acceptable.

15. Par. 4-3.2.2 .(Table). Change the heading in the last column of the table to read as shown below, the first entry in this :olumn, and add the footnote included herein:

224 REVISIONS TO NFPA 5 0 1 D 5 0 1 D - 5

Maximum Number Minimum of Recreational Pipe Sizes Vehicle Stands Inches (ID)

Served Nominal

5 3 36 4 71 5

120 6 440

See also 4-3.3.3 for size of connection to the sewer riser pipe.

16. Par. 4-3.3. Change the heading to read: ..

4-3.3 S e w e r In l e t C o n n e c t i o n s at I n d i v i d u a l Recrea t iona l V e h i c l e Stands .

17. Par. 4-3.3.2. Revise to read:

4-3.3.2 When provided, the sewer inlet to individual recre- at ional vehicle stands shall be located within 1 foot of a point on the road ( lef t )s ide of the recreational vehicle when parked on the stand, 9 feet f r o m t h e longi tudinal center line of the recreational vehicle stand and 10 feet f rom the rear of the stand.

NOTE: See Section 3-6 for Special Recreational Vehicle Stand Grouped Utility Connection Assembly and Figures A-I and A-2 of Appendix A for diagrams of typical arrangements.

18. Par. 4-3.3.3. Revise to read by adding the last seven words as shown below:

4-3;3.3 T h e connectiofi shall consist of a sewer"riser ex- • tending vertically to grade. The m i n i m u m diameter of the sewer riser pipe shall be 3 inches and it shall be provided with a 4-inch inlet or device specifically approved for the purpose.

/

19. Par. 6--5.1 (new). Insert the following new paragraph (renumber existing 6-5.1 through 6-5.4.as. 6-5.2 through 6-5.5):

6-5.1 Electr ical C o n n e c t i o n s at I n d i v i d u a l Recreat iona l V e h i c l e Stands. When provided, the electrical connections to individual recreational vehicle stands shall be located within 1 foot of a point on the road (left) side of the recreational vehicle when parked on the stand, 9 feet from the longi tudinal center line

501D-6 REPORT OF COMMITTEE ON MOBILE HOMES

225

of the recreat ional vehicle stand and 20 feet from the rear of the stand.

NOTE: See Section 3-6 for Special Recreational Vehicle Stand Grouped Utility Connection Assembly and Figures A-I and A-2 of Appendix A for diagrams of typical arrangements.

20. Figures A-1 and A-2. Revise these figures as shown below and add to the captions on each the following additional text:

This f igure shows a typical example of utility service connections which may be used where feasible in developing new recreational vehicle sites. This example should not be interpreted as indicating mandatory requirements. (See Section 3 - 6 and Paragraphs 4-1.9.1 (water) e 4-3.3 ,2 (sewer) and 6-5.1 (electrical) for utility connection details. )

,~,.-,-~ 1 OR 2WAY ROAD ~ l

1 OR 2 WAY ROAD ~

DRIVE-THROUGH TRAILER SITE PLAN

Figure A-1. See 4-1.9.1 (water), 4-3.3.2 (sewer), and 6-5.1 (electrical) for details.

226 REVISIONS TO NFPA 501D 501D-7

This figure shows a typical example of utility service connections which may be used where feasible in developing new recreational vehicle sites. This example should not be interpreted as indicating mandatory requirements. (See Section 3-6 and Paragraphs 4-1.9.1 (water), 4-3,3..2 (sewer) and 6-5.1 (electrical) for utility connection details.)

, ~ 1 OR 2 WAY ROAD

BACK-IN & PICK-UP TRAI LER SITE PLAN

1

Figure A-2. See 4-1.9.1 (water), 4-3.3.2 (sewer), and 6-5.1 (electrical) for details.