08-17-10 Regular Meeting of the Building Codes Appeals Board

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SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY 419.4 Vertical openings. Floor openings between floor levels of a live/work unit are permitted without enclosure. 419.5 Fire protection. The live/work unit shall be provided with a monitored fire alarm system where required by Section 907.2.9 and an automatic sprinkler system in accordance with Section 903.2.8. 419.6 Structural. Floor loading for the areas within a live/work unit shall be designed to conform to Table 1607.1 based on the function within the space. 419.7 Accessibility. Accessibility shall be designed in accor- dance with Chapter 11. 419.8 Ventilation. The applicable requirements of the Interna- tional Mechanical Code shall apply to each area within the live/work unit for the function within that space. SECTION 420 GROUPS 1-1, R-1, R-2, R-3 420.1 General. Occupancies in Groups 1-1, R-1, R-2 and R-3 shall comply with the provisions of this section and other appli- cable provisions of this code. 420.2 Separation walls. Walls separating dwelling units in the same building, walls separating sleeping units in the same building and walls separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as fire partitions in accordance with Sec- tion 709. 420.3 Horizontal separation. Floor assemblies separating dwelling units in the same buildings, floor assemblies separat- ing sleeping units in the same building and floor assemblies separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as horizontal assemblies in accordance with Section 112-. SECTION 421 HYDROGEN CUTOFF ROOMS [F] 421.1 General. When required by the International Fire Code, hydrogen cutoff rooms shall be designed and con- structed in accordance with Sections 421.1 through 421.8. [F] 421.2 Definitions. The following words and terms shall, for the purposes of this chapter and as used elsewhere in this code, have the meanings shown herein. [F] GASEOUS HYDROGEN SYSTEM. An assembly of piping, devices and apparatus designed to generate, store, con- tain, distribute or transport a nontoxic, gaseous hydrogen-con- taining mixture having at least 95-percent hydrogen gas by volumC? and not more than I-percent oxygen by volume. Gas- eous hydrogen systems consist of items such as compressed gas containers, reactors and appurtenances, including pressure regulators, pressure relief devices, manifolds, pumps, com- pressors and interconnecting piping and tubing and controls. [F] HYDROGEN CUTOFF ROOM. A room or space that is intended exclusively to house a gaseous hydrogen system. [F] 421.3 Location. Hydrogen cutoff rooms shall not be located below grade. 76 [F] 421.4 Design and construction. Hydrogen cutoff rooms shall be classified with respect to occupancy in accordance with Section 302.1 and separated from other areas of the build- ing by not less than I-hour fire barriers constructed in accor- dance with Section 707 or horizontal assemblies constructed in accordance with Section 712, or both; or as required by Section 508.2, 508.3 or 508.4, as applicable. [F] 421.4.1 Opening protectives. Doors within thefire bar- riers, including doors to corridors, shall be self-closing in accordance with Section 715. Interior door openings shall be electronically interlocked to prevent operation of the hydrogen system when doors are opened or ajar or the room shall be provided with a mechanical exhaust ventilation sys- tem designed in accordance with Section 421.4.1.1. [F] 421.4.1.1 Ventilation alternative. When an exhaust system is used in lieu of the interlock system required by Section 421.4.1, exhaust ventilation systems shall oper- ate continuously and shall be designed to operate at a negative pressure in relation to the surrounding area. The average velocity of ventilation at the face of the door opening with the door in the fully open position shall not be less than 60 feet per minute (0.3048 mls) with a mini- mum of 45 feet per minute (0.2287 mls) at any point in the door opening. [F] 421.4.2 Windows. Operable windows in interior walls shall not be permitted. Fixed windows shall be permitted when in accordance with Section 715. [F] 421.5 Ventilation. Cutoff rooms shall be provided with mechanical ventilation in accordance with the applicable pro- visions for repair garages in Chapter 5 of the International Mechanical Code. [F] 421.6 Gas detection system. Hydrogen cutoff rooms shall be provided with an approved flammable gas detection system in accordance with Sections 421.6.1 through 421.6.3. [F] 421.6.1 System design. The flammable gas detection system shall be listed for use with hydrogen and any other flammable gases used in the room. The gas detection system shall be designed to activate when the level of flammable gas exceeds 25 percent of the lower flammability limit (LFL) for the gas or mixtures present at their anticipated temperature and pressure. [F] 421.6.2 Operation. Activation of the gas detection sys- tem shall result in all of the following: 1. Initiation of distinct audible and visual alarm signals both inside and outside of the cutoff rOOID. 2. Activation of the mechanical ventilation system. [F] 421.6.3 Failure of the gas detection system. Failure of the gas detection system shall result in activation of the mechanical ventilation system, cessation of hydrogen gen- eration and the sounding of a trouble signal in an approved location. ( [F] 421.7 Explosion control. Explosion control shall be pro- vided in accordance with Chapter 9 of the International Fire Code. 2009 INTERNATIONAL BUILDING COD~