1910.23(a) "Protection for floor openings."
1910.23(a)(1) Every stairway floor opening shall be guarded by a standard railing constructed in accordance with
paragraph (e) of this section. The railing shall be provided on all exposed sides (except at entrance to stairway). For infrequently used stairways
where traffic across the opening prevents the use of fixed standard railing (as when located in aisle spaces, etc.), the guard shall consist of a
hinged floor opening cover of standard strength and construction and removable standard railings on all exposed sides (except at entrance to
stairway).
1910.23(a)(2) Every ladderway floor opening or platform shall be guarded by a standard railing with standard
toeboard on all exposed sides (except at entrance to opening), with the passage through the railing either provided with a swinging gate or so offset
that a person cannot walk directly into the opening.
1910.23(a)(3) Every hatchway and chute floor opening shall be guarded by one of the following:
..1910.23(a)(3)(i)
1910.23(a)(3)(i) Hinged floor opening cover of standard strength and construction equipped with standard railings
or permanently attached thereto so as to leave only one exposed side. When the opening is not in use, the cover shall be closed or the exposed side
shall be guarded at both top and intermediate positions by removable standard railings.
1910.23(a)(3)(ii) A removable railing with toeboard on not more than two sides of the opening and fixed standard
railings with toeboards on all other exposed sides. The removable railings shall be kept in place when the opening is not in use.
Where operating conditions necessitate the feeding of material into any hatchway or chute opening, protection shall be provided to prevent
a person from falling through the opening.
1910.23(a)(4) Every skylight floor opening and hole shall be guarded by a standard skylight screen or a fixed
standard railing on all exposed sides.
1910.23(a)(5) Every pit and trapdoor floor opening, infrequently used, shall be guarded by a floor opening cover
of standard strength and construction. While the cover is not in place, the pit or trap opening shall be constantly attended by someone or shall be
protected on all exposed sides by removable standard railings.
1910.23(a)(6) Every manhole floor opening shall be guarded by a standard manhole cover which need not be hinged in
place. While the cover is not in place, the manhole opening shall be constantly attended by someone or shall be protected by removable standard
railings.
1910.23(a)(7) Every temporary floor opening shall have standard railings, or shall be constantly attended by
someone.
..1910.23(a)(8)
1910.23(a)(8) Every floor hole into which persons can accidentally walk shall be guarded by either:
1910.23(a)(8)(i) A standard railing with standard toeboard on all exposed sides, or
1910.23(a)(8)(ii) A floor hole cover of standard strength and construction. While the cover is not in place, the
floor hole shall be constantly attended by someone or shall be protected by a removable standard railing.
1910.23(a)(9) Every floor hole into which persons cannot accidentally walk (on account of fixed machinery,
equipment, or walls) shall be protected by a cover that leaves no openings more than 1 inch wide. The cover shall be securely held in place to prevent
tools or materials from falling through.
1910.23(a)(10) Where doors or gates open directly on a stairway, a platform shall be provided, and the swing of
the door shall not reduce the effective width to less than 20 inches.
1910.23(b) "Protection for wall openings and holes."
1910.23(b)(1) Every wall opening from which there is a drop of more than 4 feet shall be guarded by one of the
following:
..1910.23(b)(1)(i)
1910.23(b)(1)(i) Rail, roller, picket fence, half door, or equivalent barrier. Where there is exposure below to
falling materials, a removable toe board or the equivalent shall also be provided. When the opening is not in use for handling materials, the guard
shall be kept in position regardless of a door on the opening. In addition, a grab handle shall be provided on each side of the opening with its
center approximately 4 feet above floor level and of standard strength and mounting.
1910.23(b)(1)(ii) Extension platform onto which materials can be hoisted for handling,and which shall have side
rails or equivalent guards of standard specifications.
1910.23(b)(2) Every chute wall opening from which there is a drop of more than 4 feet shall be guarded by one or
more of the barriers specified in paragraph (b)(1) of this section or as required by the conditions.
1910.23(b)(3) Every window wall opening at a stairway landing, floor, platform, or balcony, from which there is a
drop of more than 4 feet, and where the bottom of the opening is less than 3 feet above the platform or landing, shall be guarded by standard slats,
standard grill work (as specified in paragraph (e)(11) of this section), or standard railing.
Where the window opening is below the landing, or platform, a standard toe board shall be provided.
1910.23(b)(4) Every temporary wall opening shall have adequate guards but these need not be of standard
construction.
..1910.23(b)(5)
1910.23(b)(5) Where there is a hazard of materials falling through a wall hole, and the lower edge of the near
side of the hole is less than 4 inches above the floor, and the far side of the hole more than 5 feet above the next lower level, the hole shall be
protected by a standard toeboard, or an enclosing screen either of solid construction, or as specified in paragraph (e)(11) of this section.
1910.23(c) "Protection of open-sided floors, platforms, and runways."
1910.23(c)(1) Every open-sided floor or platform 4 feet or more above adjacent floor or ground level shall be
guarded by a standard railing (or the equivalent as specified in paragraph (e)(3) of this section) on all open sides except where there is entrance to
a ramp, stairway, or fixed ladder. The railing shall be provided with a toeboard wherever, beneath the open sides,
1910.23(c)(1)(i) Persons can pass,
1910.23(c)(1)(ii) There is moving machinery, or
1910.23(c)(1)(iii) There is equipment with which falling materials could create a hazard.
1910.23(c)(2) Every runway shall be guarded by a standard railing (or the equivalent as specified in paragraph
(e)(3) of this section) on all open sides 4 feet or more above floor or ground level. Wherever tools, machine parts, or materials are likely to be
used on the runway, a toeboard shall also be provided on each exposed side.
Runways used exclusively for special purposes (such as oiling, shafting, or filling tank cars) may have the railing on one side omitted
where operating conditions necessitate such omission, providing the falling hazard is minimized by using a runway of not less than 18 inches wide.
Where persons entering upon runways become thereby exposed to machinery, electrical equipment, or other danger not a falling hazard, additional
guarding than is here specified may be essential for protection.
..1910.23(c)(3)
1910.23(c)(3) Regardless of height, open-sided floors, walkways, platforms, or runways above or adjacent to
dangerous equipment, pickling or galvanizing tanks, degreasing units, and similar hazards shall be guarded with a standard railing and toe
board.
1910.23(d) "Stairway railings and guards."
1910.23(d)(1) Every flight of stairs having four or more risers shall be equipped with standard stair railings or
standard handrails as specified in paragraphs (d)(1)(i) through (v) of this section, the width of the stair to be measured clear of all obstructions
except handrails:
1910.23(d)(1)(i) On stairways less than 44 inches wide having both sides enclosed, at least one handrail,
preferably on the right side descending.
1910.23(d)(1)(ii) On stairways less than 44 inches wide having one side open, at least one stair railing on open
side.
1910.23(d)(1)(iii) On stairways less than 44 inches wide having both sides open, one stair railing on each
side.
1910.23(d)(1)(iv) On stairways more than 44 inches wide but less than 88 inches wide, one handrail on each
enclosed side and one stair railing on each open side.
1910.23(d)(1)(v) On stairways 88 or more inches wide, one handrail on each enclosed side, one stair railing on
each open side, and one intermediate stair railing located approximately midway of the width.
..1910.23(d)(2)
1910.23(d)(2) Winding stairs shall be equipped with a handrail offset to prevent walking on all portions of the
treads having width less than 6 inches.
1910.23(e) "Railing, toe boards, and cover specifications."
1910.23(e)(1) A standard railing shall consist of top rail, intermediate rail, and posts, and shall have a
vertical height of 42 inches nominal from upper surface of top rail to floor, platform, runway, or ramp level. The top rail shall be smooth-surfaced
throughout the length of the railing. The intermediate rail shall be approximately halfway between the top rail and the floor, platform, runway, or
ramp. The ends of the rails shall not overhang the terminal posts except where such overhang does not constitute a projection hazard.
1910.23(e)(2) A stair railing shall be of construction similar to a standard railing but the vertical height shall
be not more than 34 inches nor less than 30 inches from upper surface of top rail to surface of tread in line with face of riser at forward edge of
tread.
1910.23(e)(3) [Reserved]
1910.23(e)(3)(i) For wood railings, the posts shall be of at least 2-inch by 4-inch stock spaced not to exceed 6
feet; the top and intermediate rails shall be of at least 2-inch by 4-inch stock. If top rail is made of two right-angle pieces of 1-inch by 4-inch
stock, posts may be spaced on 8-foot centers, with 2-inch by 4-inch intermediate rail.
..1910.23(e)(3)(ii)
1910.23(e)(3)(ii) For pipe railings, posts and top and intermediate railings shall be at least 1 1/2 inches
nominal diameter with posts spaced not more than 8 feet on centers.
1910.23(e)(3)(iii) For structural steel railings, posts and top and intermediate rails shall be of 2-inch by
2-inch by 3/8-inch angles or other metal shapes of equivalent bending strength with posts spaced not more than 8 feet on centers.
1910.23(e)(3)(iv) The anchoring of posts and framing of members for railings of all types shall be of such
construction that the completed structure shall be capable of withstanding a load of at least 200 pounds applied in any direction at any point on the
top rail.
1910.23(e)(3)(v) Other types, sizes, and arrangements of railing construction are acceptable provided they meet
the following conditions:
1910.23(e)(3)(v)(a) A smooth-surfaced top rail at a height above floor, platform, runway, or ramp level of 42
inches nominal;
1910.23(e)(3)(v)(b) A strength to withstand at least the minimum requirement of 200 pounds top rail
pressure;
1910.23(e)(3)(v)(c) Protection between top rail and floor, platform, runway, ramp, or stair treads, equivalent at
least to that afforded by a standard intermediate rail;
..1910.23(e)(4)
1910.23(e)(4) A standard toeboard shall be 4 inches nominal in vertical height from its top edge to the level of
the floor, platform, runway, or ramp. It shall be securely fastened in place and with not more than 1/4-inch clearance above floor level. It may be
made of any substantial material either solid or with openings not over 1 inch in greatest dimension.
Where material is piled to such height that a standard toeboard does not provide protection, paneling from floor to intermediate rail, or
to top rail shall be provided.
1910.23(e)(5)
1910.23(e)(5)(i) A handrail shall consist of a lengthwise member mounted directly on a wall or partition by means
of brackets attached to the lower side of the handrail so as to offer no obstruction to a smooth surface along the top and both sides of the handrail.
The handrail shall be of rounded or other section that will furnish an adequate handhold for anyone grasping it to avoid falling. The ends of the
handrail should be turned in to the supporting wall or otherwise arranged so as not to constitute a projection hazard.
1910.23(e)(5)(ii) The height of handrails shall be not more than 34 inches nor less than 30 inches from upper
surface of handrail to surface of tread in line with face of riser or to surface of ramp.
1910.23(e)(5)(iii) The size of handrails shall be: When of hardwood, at least 2 inches in diameter; when of metal
pipe, at least 1 1/2 inches in diameter. The length of brackets shall be such as will give a clearance between handrail and wall or any projection
thereon of at least 3 inches. The spacing of brackets shall not exceed 8 feet.
..1910.23(e)(5)(iv)
1910.23(e)(5)(iv) The mounting of handrails shall be such that the completed structure is capable of withstanding
a load of at least 200 pounds applied in any direction at any point on the rail.
1910.23(e)(6) All handrails and railings shall be provided with a clearance of not less than 3 inches between the
handrail or railing and any other object.
1910.23(e)(7) Floor opening covers may be of any material that meets the following strength requirements:
1910.23(e)(7)(i) Trench or conduit covers and their supports, when located in plant roadways, shall be designed to
carry a truck rear-axle load of at least 20,000 pounds.
1910.23(e)(7)(ii) Manhole covers and their supports, when located in plant roadways, shall comply with local
standard highway requirements if any; otherwise, they shall be designed to carry a truck rear-axle load of at least 20,000 pounds.
1910.23(e)(7)(iii) The construction of floor opening covers may be of any material that meets the strength
requirements. Covers projecting not more than 1 inch above the floor level may be used providing all edges are chamfered to an angle with the
horizontal of not over 30 degrees. All hinges, handles, bolts, or other parts shall set flush with the floor or cover surface.
..1910.23(e)(8)
1910.23(e)(8) Skylight screens shall be of such construction and mounting that they are capable of withstanding a
load of at least 200 pounds applied perpendicularly at any one area on the screen. They shall also be of such construction and mounting that under
ordinary loads or impacts, they will not deflect downward sufficiently to break the glass below them. The construction shall be of grillwork with
openings not more than 4 inches long or of slatwork with openings not more than 2 inches wide with length unrestricted.
1910.23(e)(9) Wall opening barriers (rails, rollers, picket fences, and half doors) shall be of such construction
and mounting that, when in place at the opening, the barrier is capable of withstanding a load of at least 200 pounds applied in any direction (except
upward) at any point on the top rail or corresponding member.
1910.23(e)(10) Wall opening grab handles shall be not less than 12 inches in length and shall be so mounted as to
give 3 inches clearance from the side framing of the wall opening. The size, material, and anchoring of the grab handle shall be such that the
completed structure is capable of withstanding a load of at least 200 pounds applied in any direction at any point of the handle.
1910.23(e)(11) Wall opening screens shall be of such construction and mounting that they are capable of
withstanding a load of at least 200 pounds applied horizontally at any point on the near side of the screen. They may be of solid construction, of
grillwork with openings not more than 8 inches long, or of slatwork with openings not more than 4 inches wide with length unrestricted.
[39 FR 23502, June 27, 1974, as amended at 43 FR 49744, Oct. 24, 1978; 49 FR 5321, Feb. 10, 1984]
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