1015.4 Opening limitations.
BC § 1015.4
Required guards shall not have openings that allow passage of a sphere 4 inches (101.6 mm) in diameter from the walking surface to the required guard height. Exceptions: 1. From a height of 36 inches (914.4 mm) to 42 inches (1066.8 mm), guards shall not have openings that allow passage of a sphere 4 3/8 inches (111.1 mm) in diameter.
2.The triangular openings at the open sides of a stair, formed by the riser, tread and bottom rail shall not allow passage of a sphere 6 inches (152.4 mm) in diameter.
3.At elevated walking surfaces that are not open to the public for access to and use of electrical, mechanical or plumbing systems or equipment, guards shall not have openings that allow passage of a sphere 21 inches (533.4 mm) in diameter.
4.In areas that are not open to the public within occupancies in Group I-3, F, H or S, and for alternating tread devices and ships ladders, guards shall not have openings that allow passage of a sphere 21 inches (533.4 mm) in diameter.
5.In assembly seating areas, guards required at the end of aisles in accordance with Section 1029.16.4 shall not have openings that allow passage of a sphere 4 inches (101.6 mm) in diameter up to a height of 26 inches (660.4 mm). From a height of 26 inches (660.4 mm) to 42 inches (1066.8 mm) above the adjacent walking surfaces, guards shall not have openings that allow passage of a sphere 8 inches (203.2 mm) in diameter.
6.Within individual dwelling units and sleeping units in Group R-2 and R-3 occupancies, guards on the open sides of stairs shall not have openings that allow passage of a sphere 4 3/8 inches (111.1 mm) in diameter.
