14B-5-509  Incidental uses.
The provisions of Section 509 of IBC are adopted by reference with the following modifications:
1.   Replace Table 509 as shown:
TABLE 509
INCIDENTAL USES
ROOM OR AREA
SEPARATION AND/OR PROTECTION
ROOM OR AREA
SEPARATION AND/OR PROTECTION
Furnace room where any piece of equipment is over 400,000 Btu per hour input
2 hours
Rooms with boilers where the largest piece of equipment is over 15 psi and 10 horsepower
2 hours
Furnace rooms and boiler rooms in buildings having an occupant load exceeding 200 persons
2 hours
Furnace rooms and boiler rooms in Group I occupancies
2 hours
Furnace rooms and boiler rooms in other than Group R-5 occupancies
1 hour
Refrigerant machinery room
1 hour
Hydrogen fuel gas rooms, not classified as Group H
1 hour in Group B, F, M, S and U occupancies;
2 hours in Group A, E, I and R occupancies.
Incinerator rooms
2 hours and provide automatic sprinkler system
Paint shops, not classified as Group H, located in occupancies other than Group F
2 hours; or 1 hour and provide automatic sprinkler system
In Group E occupancies, laboratories and vocational shops not classified as Group H
1 hour
In Group I-2 occupancies, laboratories not classified as Group H
1 hour and provide automatic sprinkler system
In ambulatory care facilities, laboratories not classified as Group H
1 hour
Laundry rooms over 100 square feet
1 hour
Group I-3 cells and Group I-2 patient rooms equipped with padded surfaces
1 hour
In Group I-2, physical plant maintenance shops
1 hour
Waste, recycling and linen collection rooms with containers that have an aggregate volume of 10 cubic feet or greater in ambulatory care facilities or Group I-2 occupancies
1 hour
Waste, recycling and linen collection rooms over 100 square feet
1 hour
Storage rooms over 100 square feet in ambulatory care facilities and Group A, E, I, R-1, R-2, R-3 or R-4 occupancies
2 hours or 1 hour and provide automatic sprinkler system
Storage rooms used for combustible material in buildings with an exhibition area
2 hours and provide automatic sprinkler system
Stationary storage battery systems having an energy capacity greater than the threshold quantity specified in the Chicago Fire Prevention Code
1 hour in Group B, F, M, S and U occupancies;
2 hours in Group A, E, I and R occupancies.
Telecommunication equipment areas over 50 square feet and not over 150 square feet
2 hours or 1 hour and provide automatic sprinkler systema
Telecommunication equipment areas over 150 square feet
2 hours a
Electrical installations and transformers
See Sections 110.26 through 110.34 and Sections 450.8 through 450.48 of the Chicago Electrical Code for protection and separation requirements.
 
For SI: 1 square foot = 0.0929 m 2, 1 pound per square inch (psi) = 6.9 kPa, 1 British thermal unit (Btu) per hour = 0.293 watts, 1 horsepower = 746 watts, 1 gallon = 3.785 L, 1 cubic foot = 0.0283 m 3.
a.   Telecommunication equipment areas over 150 square feet require an automatic fire extinguishing system in accordance with section 903.2.11.7.
2.   Revise the exception to Section 509.1 to read:
Exception: Incidental uses within and serving a single dwelling unit or sleeping unit are not required to comply with this section.”
3.   Revise Section 509.3 to read:
509.3 Area limitations.
Incidental uses shall not occupy more than 10 percent of the gross floor area of the primary occupancy in which they are located.”
4.   Delete the second sentence in Section 509.4.1.
5.   Delete Section 509.4.2 and its subsections.
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 19; Amend Coun. J. 6-25-21, p. 32180, Art. II, § 8)