Date of Adoption: November 26, 2002.
Purpose: To adopt provisions in chapter 51-40 WAC regarding elevator shaft pressurization when used as an alternate to providing elevator lobbies at each floor where an elevator opens into a corridor.
Citation of Existing Rules Affected by this Order: Amending chapter 51-40 WAC, Sections 403.7, 905.2.1, and 1004.3.4.5.
Statutory Authority for Adoption: RCW 19.27.031, 19.27.074.
Adopted under notice filed as WSR 02-20-042 on September 25, 2002.
Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.
Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, Amended 3, Repealed 0.
Number of Sections Adopted on the Agency's Own Initiative: New 0, Amended 0, Repealed 0.
Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 0, Repealed 0.
Number of Sections Adopted Using Negotiated Rule Making:
Pilot Rule Making:
or Other Alternative Rule Making:
Effective Date of Rule: July 1, 2003.
November 26, 2002
for James M. Lewis
AMENDATORY SECTION(Amending WSR 98-02-054, filed 1/6/98, effective 7/1/98)
WAC 51-40-0403 Section 403 -- Special provisions for Group B office buildings and Group R, Division 1 Occupancies.
403.6.1 General. A central control station room for fire department operations shall be provided. The location, size and arrangement of the central control station shall be approved by the authority having jurisdiction. The central control station room shall be separated from the remainder of the building by not less than a one-hour fire-resistive occupancy separation. It shall contain the following as a minimum:
1. The voice alarm and public address system panels.
2. The fire department communications panel.
3. Fire-detection and alarm systems annunciator panels.
4. Annunciator visually indicating the location of the elevators and whether they are operational.
5. Status indicators and controls for air-handling systems.
6. Controls for unlocking all stairway doors simultaneously.
7. Sprinkler valve and water-flow detector display panels.
8. Emergency and standby power status indicators.
9. A telephone for fire department use with controlled access to the public telephone system.
10. Fire pump status indicators.
11. Schematic building plans indicating the typical floor plan and detailing the building core, means of egress, fire-protection systems, fire fighting equipment and fire department access.
12. Work table.
403.7 Elevators. Elevators and elevator lobbies shall comply with the provisions of Chapter 30 and the following:
|Note:||A bank of elevators is a group of elevators or a single elevator controlled by a common operating system;
that is, all those elevators that respond to a single call button constitute a bank of elevators. There is no
limit on the number of cars that may be in a bank or group, but there may not be more than four cars within
a common hoistway.
|EXCEPTIONS:||1. The main entrance-level elevator lobby in office buildings.|
|2. Elevator lobbies located within an atrium complying with the provisions of Section 402.|
|3. In fully sprinklered office buildings, corridors may lead through enclosed elevator lobbies if all areas of the building have access to at least one required means of egress without passing through the elevator lobby.|
|4. Where elevator shafts are pressurized in accordance with Section 905, elevator lobbies need not be
3. Elevator hoistways shall not be vented through an elevator machine room. Each elevator machine room shall be treated as a separate smoke-control zone.
[Statutory Authority: RCW 19.27.031 and 19.27.074. 98-02-054, § 51-40-0403, filed 1/6/98, effective 7/1/98.]
905.2.1 General. Buildings or portions thereof required by this code to have a smoke-control system shall have such systems designed in accordance with the requirements of this section.
|EXCEPTIONS:||1. Smoke and heat venting required by Section 906.|
|2. Where elevator shaft pressurization is required to comply with Exception 4 of Section 403.7 item 1 or Exception 4 of Section 1004.3.4.5, the pressurization system shall comply with the following:|
|2.1. Elevator shafts shall be pressurized to not less than 0.10 inch of water column relative to atmospheric pressure. Elevator pressurization shall be measured with elevator cars at the designated primary recall level with the doors in the open position. The test shall be conducted at the location of the calculated maximum positive stack effect in the elevator shaft. The measured pressure shall be sufficient to provide 0.10 inch of water column as well as accounting for the stack and wind effect expected on the mean low temperature January day.|
|2.2. The elevator shaft pressurization shall be activated by a fire alarm system which shall include smoke detectors or other approved detectors located near the elevator shaft on each floor as approved by the building official and the fire chief. If the building has a fire alarm panel, detectors shall be connected to, with power supplied by, the fire alarm panel.|
|2.3. Elevator shaft pressurization equipment and its ductwork located within the building shall be separated from other portions of the building by construction equal to that required for the elevator shaft.|
|2.4. Elevator shaft pressurization air intakes shall be located in accordance with Section 905.7.4. Such intakes shall be provided with smoke detectors which upon detection of smoke, shall deactivate the pressurization fan supplied by that air intake.|
|2.5. The power source for the fire alarm system and the elevator shaft pressurization system shall be in accordance with Section 905.8.|
|2.6. Hoistway venting required by Section 3004 need not be provided for pressurized elevator shafts.|
|2.7. Elevator machine rooms required to be pressurized by Section 3005.2 need not be pressurized where separated from the hoistway by shaft construction in accordance with Section 711.|
|2.8. Special inspection shall be required in accordance with Section 905.15.9 and Section 1701.|
1004.3.2.3.1 Width. The clear width of aisles shall be based on the number of fixed seats served by the aisle. The required width of aisles serving fixed seats shall not be used for any other purpose.
The clear width of an aisle in inches shall not be less than the occupant load served by the aisle multiplied by 0.3 for aisles with slopes greater than 1 unit vertical to 8 units horizontal (12.5% slope) and not less than 0.2 for aisles with a slope of 1 unit vertical to 8 units horizontal (12.5% slope) or less. In addition, when the rise of steps in aisles exceeds 7 inches (178 mm), the aisle clear width shall be increased by 1 1/4 inches (32 mm) for each 100 occupants or fraction thereof served for each 1/4 inch (6.35 mm) of riser height above 7 inches (178 mm).
For buildings with smoke-protected assembly seating and for which an approved life-safety evaluation
is conducted, the minimum clear width of aisles and other means of egress may be in accordance with
Table 10-D. For Table 10-D, the number of seats specified must be within a single assembly area, and
interpolation shall be permitted between the specified values shown. If Table 10-D is used the
minimum clear widths shown shall be modified in accordance with the following:
1. Where risers exceed 7 inches (178 mm) in height, multiply the stairway width in the tables by factor
A = 1 +
|(riser height - 7.0 inches)||(4-1)|
A = 1 +
|(riser height - 178 mm)|
|Where risers do not exceed 7 inches (178 mm) in height, A = 1.|
|2. Stairways not having a handrail within a 30-inch (762 mm) horizontal distance shall be 25 percent wider than otherwise calculated, i.e., multiply by B = 1.25. For all other stairs, B = 1.|
|3. Ramps steeper than 1 unit vertical in 10 units horizontal (10% slope) where used in ascent shall have their width increased by 10 percent, i.e., multiply by C = 1.10. For ramps not steeper than 1 unit vertical in 10 units horizontal (10% slope), C = 1. Where fixed seats are arranged in rows, the clear width of aisles shall not be less than set forth above or less than the following minimum widths:|
|3.1 Forty-eight inches (1219 mm) for stairways having seating on both sides.|
|3.2 Thirty-six inches (914 mm) for stairways having seating on one side.|
|3.3 Twenty-three inches (584 mm) between a stairway handrail and seating where the aisles are subdivided by the handrail.|
|3.4 Forty-two inches (1067 mm) for level or ramped aisles having seating on both sides.|
|3.5 Thirty-six inches (914 mm) for level or ramped aisles having seating on one side.|
|3.6 Twenty-three inches (584 mm) between a stairway handrail and seating where an aisle does not
serve more than five rows on one side.
1004.3.2.5.2 Where required. Aisles with a slope steeper than 1 unit vertical in 8 units horizontal (12.5% slope) shall consist of a series of risers and treads extending across the entire width of the aisle, except as provided in Section 1004.3.2.6.
The height of risers shall not be more than 8 inches (203 mm) nor less than 4 inches (102 mm) and the tread run shall not be less than 11 inches (279 mm). The riser height shall be uniform within each flight and the tread run shall be uniform throughout the aisle. Variations in run or height between adjacent treads or risers shall not exceed 3/16 inch (4.8 mm).
Where the slope of aisle steps and the adjoining seating area is the same, the riser heights may be
increased to a maximum of 9 inches (229 mm) and may be nonuniform, but only to the extent
necessitated by changes in the slope of the adjoining seating area to maintain adequate sight lines.
Variations may exceed 3/16 inch (4.8 mm) between adjacent risers, provided the exact location of such
variations is identified with a marking stripe on each tread at the nosing or leading edge adjacent to the
nonuniform riser. The marking stripe shall be distinctively different from the contrasting marking
A contrasting marking stripe or other approved marking shall be provided on each tread at the nosing or leading edge such that the location of each tread is readily apparent when viewed in descent. Such stripe shall be a minimum of 1 inch (25 mm) wide and a maximum of 2 inches (51 mm) wide.
The marking stripe may be omitted where tread surfaces are such that the location of each tread is
readily apparent when viewed in descent.
1004.3.2.6 Ramp Slope. The slope of ramped aisles shall not be more than 1 unit vertical in 8 units horizontal (12.5% slope). Ramped aisles shall have a slip-resistant surface.
When provided with fixed seating, theaters may have a slope not steeper than 1 unit vertical in 5 units
horizontal (20% slope).
1004.3.2.7 Handrails. Handrails shall comply with the height, size and shape dimensions set forth in Section 1003.3.3.6, and ends shall be returned or shall have rounded terminations or bends. Ramped aisles having a slope steeper than 1 unit vertical in 15 units horizontal (6.7% slope) and aisle stairs (two or more adjacent steps) shall have handrails located either at the side or within the aisle width. Handrails may project into the required aisle width a distance of 3 1/2 inches (89 mm).
1. Handrails may be omitted on ramped aisles having a slope not steeper than 1 unit vertical in 5 units
horizontal (20% slope) and having fixed seats on both sides of the aisle.
2. Handrails may be omitted where a guardrail is at the side of an aisle that conforms to the size and
shape requirements for handrails.
Handrails located within the aisle width shall be discontinuous with gaps or breaks at intervals not to exceed five rows. These gaps or breaks shall have a clear width of not less than 22 inches (559 mm) not more than 36 inches (914 mm) measured horizontally.
1004.3.4.5 Elevators. Elevators opening into a corridor shall be provided with an elevator lobby at each floor containing such a corridor. The lobby shall completely separate the elevators from the corridor by construction conforming to Section 1004.3.4.3.1 and all openings into the lobby wall contiguous with the corridor shall be protected as required by Section 1004.3.4.3.2.
1. In office buildings, separations need not be provided from a street floor lobby, provided the entire
street floor is protected with an automatic sprinkler system.
2. Elevators not required to meet the shaft enclosure requirements of Section 711.
3. When additional doors are provided in accordance with Section 3007.
4. In fully sprinklered buildings, where elevator and stair shafts are pressurized in accordance with
Section 905, elevator lobbies need not be provided.
Elevator lobbies shall comply with Section 3002.
[Statutory Authority: RCW 19.27.031, 19.27.074. 01-02-095, § 51-40-1004, filed 1/3/01, effective 7/1/01; 98-02-054, § 51-40-1004, filed 1/6/98, effective 7/1/98.]