Washington Administrative Code

(1) At least one smoke detector (which may be a single station smoke detector) must be installed in each commercial coach to protect each separate bedroom. Smoke detectors must meet the requirements of the Standard for Single and Multiple Station Smoke Detectors of the Underwrite…

The manufacturer must provide printed instructions upon request for each commercial coach specifying the following:(1) The location and required capacity of stabilizing devices, such as tie downs, piers, and blocking;(2) Devices and methods used to connect all components and syst…

number of ties required per side ofcommercial coachNote:This table is based on a minimum working load per anchor of three thousand one hundred fifty pounds with a fifty percent overload (four thousand seven hundred twenty-five pounds total).Length of Commercial Coach (Feet)No. of…

This chapter applies to the installation of electrical equipment in any commercial coach bearing or required to bear a department insignia.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1220, file…

Definitions contained in the current adopted edition National Electrical Code (NEC), and the following definitions apply to the commercial coach electrical standards in this chapter."Converter" is a device that changes electrical energy from one form to another, as from alternati…

Branch circuit and feeder calculations must be determined according to the National Electrical Code.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1240, filed 10/23/96, effective 11/25/96.]

(1) The branch circuit equipment may be combined with the disconnecting means as a single assembly. Such a combination may be designated as a distribution panelboard. If a fused distribution panelboard is used, the maximum fuse size for the mains must be plainly marked with lette…

A commercial coach must be provided with feeder assembly equipment, installed by the manufacturer according to National Electrical Code and the provisions of this chapter. The assembly must be either:(1) One overhead assembly containing the required number of insulated color-code…

(1) Each commercial coach equipped with a 120-volt electrical system must have a label, permanently attached on the outside wall adjacent to the point of entrance of the feeder assembly, that reads:"THIS CONNECTION IS FOR 110-125 VOLT AC SERVICE. DO NOT CONNECT HIGHER VOLTAGE."(2…

(1) Where circuits in expandable or multiple units are designed to be energized from one main panelboard, permanent-type wiring methods and materials must be used for connecting the units to each other.(2) Commercial coaches may have individual branch circuit panelboards installe…

Outdoor or under-chassis wiring (120/240 volts) exposed to moisture and mechanical damage must be protected by rigid metal conduit, electrical metallic tubing, liquid-tight flexible metal conduit, or nonmetallic conduit. The conductors shall be type RW, TW, or equivalent.[Statuto…

Electrical equipment must be securely mounted to prevent displacement during transit. Meter bases must not be mounted on commercial coaches.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1300, fil…

Storage batteries subject to the provisions of this standard must be securely attached to the commercial coach. They must be installed in an area which is vapor-tight to the interior and ventilated directly to the exterior of the coach. When batteries are installed in a compartme…

Grounding of both electrical and nonelectrical metal parts in a commercial coach must be through connection to a grounding bus in the commercial coach distribution panel. The grounding bus must be grounded through the green conductor in the supply cord. It may also be grounded th…

(1)(a) The wiring of each commercial coach must be subjected to a one-minute, 900-volt, dielectric strength test between live parts (including neutral) and the commercial coach ground. All switches must be closed during the test. (Closed switches are in the on position.)(b) The t…

This chapter applies to the installation of mechanical, ventilation, and indoor air quality equipment in any commercial coach bearing or required to bear a department insignia. Mechanical, ventilation, and indoor air quality equipment and installations in or on a commercial coach…

Definitions contained in the International Mechanical Code, current edition, and the following definitions apply to the commercial coaches."Accessible" is having access to a fixture, connection, appliance, or equipment that requires the removal of an access panel, door, or simila…

Where HVAC equipment manufacturers show multiple cubic feet per minute (CFM) ratings and/or multiple water gauge ratings, you must use the highest rated capacity.[Statutory Authority: RCW 43.22.340, 43.22.350, 43.22.355, 43.22.360, 43.22.400, 43.22.432, 43.22.433, 43.22.434, 43.2…

(1) LPG containers must not be installed, nor stored temporarily, inside any commercial coach.Exception:This prohibition does not apply to completely self-contained hand torches, lanterns, or similar equipment with containers having a maximum water capacity of two and one-half po…

Commercial coaches requiring fuel gas for any purpose must be equipped with a gas piping system that is designed for LPG only or combination LPG and natural gas.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146,…

Where gas piping is to be installed in more than one portion of an expandable or multiple commercial coach, the design and construction must be as follows:(1) There must be only one point of cross over, readily accessible from the exterior of the commercial coach.(2) The connecto…

(1) Tubing must not be run inside walls, floors, partitions, or roofs.(2) If tubing passes through walls, floors, partitions, roofs, or similar installations, the tubing must be protected by the use of weather resistant grommets that snugly fit both the tubing and the hole throug…

(1) Screw joints must be made tight with pipe-joint compound that is insoluble in liquefied petroleum gas.(2) Pipe-joint compound must be approved for the type of gas used. The pipe-joint compound must be applied to the male threads only.[Statutory Authority: RCW 43.22.340, [43.2…

(1) All gas piping must be adequately supported by galvanized or equivalently protected metal straps or hangers at intervals of not more than four feet, except where adequate support and protection is provided by structural members.(2) Gas pipe supply connections must be rigidly …

(1) Gas piping must not be used for an electrical ground.(2) The gas line must be bonded.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1410, filed 10/23/96, effective 11/25/96.]

A label must be permanently attached on the outside of the exterior wall of the commercial coach adjacent to the gas supply connection which provides the following information:(1) The type of system (i.e., liquid petroleum system or natural gas system or combination liquid petrol…

All openings in the gas piping system must be closed gas-tight with threaded pipe plugs or pipe caps.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1430, filed 10/23/96, effective 11/25/96.]

(1) In addition to any valve on the appliance, a shut-off valve must be installed in the fuel piping outside of each gas appliance but inside the commercial coach structure and upstream of the union or connector. The shut-off valve must be located within six feet of a cooking app…

(1) The piping system must stand a pressure of at least ten psi gauge for a period of not less than fifteen minutes without showing any drop in pressure.(2) Pressure must be measured with a gauge calibrated to be read in increments of not greater than one-tenth pound.(3) The sour…

(1) After gas appliances have been connected, the gas-piping system must be subjected to a pressure test with the burner valves closed. The test consists of air at not less than ten inches nor more than fourteen inches pressure of water column (six to eight ounces). The system mu…

Ventilation and indoor air quality equipment and installations in or on a commercial coach must be made according to the requirements of the International Mechanical Code, current edition, the rules of this chapter, and the conditions of the equipment approval.[Statutory Authorit…

The International Mechanical Code, current edition, and the following definitions apply to the commercial coach ventilation and indoor air quality rules in this chapter."Duct" is a conduit or passageway for conveying air to or from heating, cooling, air conditioning, or ventilati…

In addition to requirements of the Washington State Ventilation and Indoor Air Quality Code:(1) The installation of each appliance must conform to the manufacturer's installation instructions. The manufacturer's instructions must be attached to the appliance.(2) Combustion air in…

In addition to requirements of the Washington State Ventilation and Indoor Air Quality Code:(1) All water heaters must be installed with approved fully automatic valve or valves designed to provide temperature and pressure relief. Temperature and pressure relief valves must be te…

In addition to the requirements of the International Mechanical Code and the Washington State Energy Code air ducts for:(1) An expandable or multiple commercial coach may have ducts of the heating system installed in the various units. The points of connection must be so designed…

Every heating and cooling duct and plenum must be installed according to the International Mechanical Code and the Washington State Energy Code.[Statutory Authority: Chapter 43.22 RCW and 2003 c 291. WSR 05-01-102, § 296-150C-1520, filed 12/14/04, effective 2/1/05. Statutory Auth…

This chapter also applies to the installation of plumbing equipment in any commercial coach bearing or required to bear a department insignia. Plumbing fixtures, equipment, and installations in commercial coaches must conform to the provisions of the Uniform Plumbing Code and the…

The definitions listed below, in addition to the Uniform Plumbing Code definitions apply to this chapter."Drain outlet" is the discharge end of the commercial coach main drain to which a drain connector may be attached."Main drain" is the principal artery of the commercial coach …

The department will only require that a tee be installed in an accessible location for the future addition of an expansion tank where one may be installed if required.[Statutory Authority: RCW 43.22.340 and 43.22.480. WSR 99-13-010, § 296-150C-1545, filed 6/4/99, effective 7/5/99…

Drain outlets must be equipped with a watertight cap or plug that is permanently attached to the vehicle.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1550, filed 10/23/96, effective 11/25/96.]

The drain outlet and couplers must have a minimum clearance of three inches in any direction from all parts of the structure or appurtenances and at least eighteen inches unrestricted clearance directly in front of the drain outlet.[Statutory Authority: RCW 43.22.340, [43.22.]355…

(1) Each commercial coach equipped with a water distribution system must have a water-supply connection that terminates within eighteen inches of the outside wall of the commercial coach.(2) Water-supply connections must be equipped with a watertight cap or plug that is permanent…

(Effective until July 1, 2026)GENERAL INFORMATIONManufacture: Manufacturer # 1.Building use: 2.Building occupancy: 3.Type of construction: VB 4.Square footage of building: 5.Valuation of the building shall be based on the following:•Square footage of the building multiplied by th…

(1) This chapter is authorized by RCW 43.22.420, 43.22.434 and 43.22.450 through 43.22.490, covering the construction and approval of factory-built housing and commercial structures before occupancy.(2) This chapter applies to the approval:(a) Of factory-built structures used for…

"Approved" is approved by the department of labor and industries."Building site" is a tract, parcel, or subdivision of land on which a factory-built house or commercial structure will be installed."Component" is a part or element of another system as defined by the International …

(1) To enforce this chapter, we or another governmental inspection agency will inspect each factory-built house and commercial structure that is sited in Washington. Inspections will be conducted during normal work hours or at other reasonable times. (See WAC 296-150F-0070.)(2) W…

We will only release manufacturing information such as design plans, specifications, and test results according to the requirements of the Public Records Act (see RCW 42.17.310 (1)(h)) unless we are ordered to do so by a court or otherwise required by law.[Statutory Authority: RC…

(1) We may prohibit the installation of factory-built housing and commercial structures if they do not conform to the requirements of this chapter. (See RCW 43.22.465.)(2) If an inspection reveals that a factory-built home or commercial structure violates this chapter, we may obt…

(1) We have entered into reciprocal agreements with states who have construction standards that are equal to or greater than our standards for factory-built housing and commercial structures.(2) When we have a reciprocal agreement with another state:(a) The reciprocal state inspe…

(1) A local enforcement agency (city or county), under contract with us, can inspect factory-built housing, commercial structures, and components. In some cases their contract may be limited to specific portions of an inspection at specified manufacturing locations.(2) After appr…