403.5 - Means of egress and evacuation
The means of egress in high-rise buildings shall comply with Sections 403.5.1 through 403.5.6.
403.5.1
Remoteness of exit stairway
enclosures. The required exit stairway enclosures shall
be separated by a distance not less than 30 feet (9144 mm) or not less than
one-fourth of the length of the maximum overall diagonal dimension of the
building or area to be served, whichever is less. The distance shall be
measured in a straight line between the nearest points of the exit
stairway enclosures. In buildings with three or more exit
stairway enclosures, at least two of the exit
stairway enclosures shall comply with this section. Interlocking or
scissor stairs shall be counted as one exit
stairway.
403.5.2
Additional exit stairway. For buildings other than Group R-2 that are
more than 420 feet (128 m) in building height, one additional
exit stairway meeting the requirements of Sections 1009 and
1022 shall be provided in addition to the minimum number of
exits required by Section 1021.1. The total width of any
combination of remaining exit stairways with one exit
stairway removed shall not be less than the total width required by
Section 1005.1. Scissor stairs shall not be considered the
additional exit stairway required by this section.
Exception: An additional exit stairway shall not be required to be installed in buildings having elevators used for occupant self-evacuation in accordance with Section 3008.
403.5.3
Stairway door operation. Stairway doors other than the exit
discharge doors shall be permitted to be locked from the stairway
side. Stairway doors that are locked from the stairway side shall be capable of
being unlocked simultaneously without unlatching upon a signal from the fire
command center.
403.5.3.1
Stairway
communication system. A telephone or other two-way communications system
connected to an approved constantly attended station shall be
provided at not less than every fifth floor in each stairway
where the doors to the stairway are locked.
403.5.4
Smokeproof exit
enclosures. Every required exit stairway serving floors
more than 75 feet (22 860 mm) above the lowest level of fire department vehicle
access shall comply with Sections 909.20 and 1022.9.
403.5.5
Luminous egress path
markings. Luminous egress path markings shall be provided in accordance
with Section 1024.
403.5.6
Emergency escape and rescue. Emergency escape and rescue openings
required by Section 1029 are not required.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.