This section does not apply to aerial lifts, the criteria
for which are set out exclusively in 1926.453.
1926.451(a)
"Capacity"
1926.451(a)(1)
Except as provided in paragraphs (a)(2), (a)(3), (a)(4),
(a)(5) and (g) of this section, each scaffold and scaffold component shall
be capable of supporting, without failure, its own weight and at least 4
times the maximum intended load applied or transmitted to it.
1926.451(a)(2)
Direct connections to roofs and floors, and counterweights
used to balance adjustable suspension scaffolds, shall be capable of
resisting at least 4 times the tipping moment imposed by the scaffold
operating at the rated load of the hoist, or 1.5 (minimum) times the
tipping moment imposed by the scaffold operating at the stall load of the
hoist, whichever is greater.
1926.451(a)(3)
Each suspension rope, including connecting hardware, used
on non-adjustable suspension scaffolds shall be capable of supporting,
without failure, at least 6 times the maximum intended load applied or
transmitted to that rope.
..1926.451(a)(4)
1926.451(a)(4)
Each suspension rope, including connecting hardware, used
on adjustable suspension scaffolds shall be capable of supporting, without
failure, at least 6 times the maximum intended load applied or transmitted
to that rope with the scaffold operating at either the rated load of the
hoist, or 2 (minimum) times the stall load of the hoist, whichever is
greater.
1926.451(a)(5)
The stall load of any scaffold hoist shall not exceed 3
times its rated load.
1926.451(a)(6)
Scaffolds shall be designed by a qualified person and
shall be constructed and loaded in accordance with that design.
Non-mandatory Appendix A to this subpart contains examples of criteria
that will enable an employer to comply with paragraph (a) of this
section.
1926.451(b)
"Scaffold platform construction."
1926.451(b)(1)
Each platform on all working levels of scaffolds shall be
fully planked or decked between the front uprights and the guardrail
supports as follows:
1926.451(b)(1)(i)
Each platform unit (e.g., scaffold plank, fabricated
plank, fabricated deck, or fabricated platform) shall be installed so that
the space between adjacent units and the space between the platform and
the uprights is no more than 1 inch (2.5 cm) wide, except where the
employer can demonstrate that a wider space is necessary (for example, to
fit around uprights when side brackets are used to extend the width of the
platform).
..1926.451(b)(1)(ii)
1926.451(b)(1)(ii)
Where the employer makes the demonstration provided for in
paragraph (b)(1)(i) of this section, the platform shall be planked or
decked as fully as possible and the remaining open space between the
platform and the uprights shall not exceed 9 1/2 inches (24.1 cm).
Exception to paragraph (b)(1): The requirement in
paragraph (b)(1) to provide full planking or decking does not apply to
platforms used solely as walkways or solely by employees performing
scaffold erection or dismantling. In these situations, only the planking
that the employer establishes is necessary to provide safe working
conditions is required.
1926.451(b)(2)
Except as provided in paragraphs (b)(2)(i) and (b)(2)(ii)
of this section, each scaffold platform and walkway shall be at least 18
inches (46 cm) wide.
1926.451(b)(2)(i)
Each ladder jack scaffold, top plate bracket scaffold,
roof bracket scaffold, and pump jack scaffold shall be at least 12 inches
(30 cm) wide. There is no minimum width requirement for boatswains'
chairs.
Note to paragraph (b)(2)(i): Pursuant to an administrative
stay effective November 29, 1996 and published in the Federal Register on
November 25, 1996, the requirement in paragraph (b)(2)(i) that roof
bracket scaffolds be at least 12 inches wide is stayed until November 25,
1997 or until rulemaking reguarding the minimum width of roof bracket
scaffolds has been completed, whichever is later.
1926.451(b)(2)(ii)
Where scaffolds must be used in areas that the employer
can demonstrate are so narrow that platforms and walkways cannot be at
least 18 inches (46 cm) wide, such platforms and walkways shall be as wide
as feasible, and employees on those platforms and walkways shall be
protected from fall hazards by the use of guardrails and/or personal fall
arrest systems.
1926.451(b)(3)
Except as provided in paragraphs (b)(3)(i) and (ii) of
this section, the front edge of all platforms shall not be more than 14
inches (36 cm) from the face of the work, unless guardrail systems are
erected along the front edge and/or personal fall arrest systems are used
in accordance with paragraph (g) of this section to protect employees from
falling.
..1926.451(b)(3)(i)
1926.451(b)(3)(i)
The maximum distance from the face for outrigger scaffolds
shall be 3 inches (8 cm);
1926.451(b)(3)(ii)
The maximum distance from the face for plastering and
lathing operations shall be 18 inches (46
cm).
1926.451(b)(4)
Each end of a platform, unless cleated or otherwise
restrained by hooks or equivalent means, shall extend over the centerline
of its support at least 6 inches (15 cm).
1926.451(b)(5)
1926.451(b)(5)(i)
Each end of a platform 10 feet or less in length shall not
extend over its support more than 12 inches (30 cm) unless the platform is
designed and installed so that the cantilevered portion of the platform is
able to support employees and/or materials without tipping, or has
guardrails which block employee access to the cantilevered end.
1926.451(b)(5)(ii)
Each platform greater than 10 feet in length shall not
extend over its support more than 18 inches (46 cm), unless it is designed
and installed so that the cantilevered portion of the platform is able to
support employees without tipping, or has guardrails which block employee
access to the cantilevered end.
..1926.451(b)(6)
1926.451(b)(6)
On scaffolds where scaffold planks are abutted to create a
long platform, each abutted end shall rest on a separate support surface.
This provision does not preclude the use of common support members, such
as "T" sections, to support abutting planks, or hook on platforms designed
to rest on common supports.
1926.451(b)(7)
On scaffolds where platforms are overlapped to create a
long platform, the overlap shall occur only over supports, and shall not
be less than 12 inches (30 cm) unless the platforms are nailed together or
otherwise restrained to prevent movement.
1926.451(b)(8)
At all points of a scaffold where the platform changes
direction, such as turning a corner, any platform that rests on a bearer
at an angle other than a right angle shall be laid first, and platforms
which rest at right angles over the same bearer shall be laid second, on
top of the first platform.
1926.451(b)(9)
Wood platforms shall not be covered with opaque finishes,
except that platform edges may be covered or marked for identification.
Platforms may be coated periodically with wood preservatives,
fire-retardant finishes, and slip-resistant finishes; however, the coating
may not obscure the top or bottom wood surfaces.
1926.451(b)(10)
Scaffold components manufactured by different
manufacturers shall not be intermixed unless the components fit together
without force and the scaffold's structural integrity is maintained by the
user. Scaffold components manufactured by different manufacturers shall
not be modified in order to intermix them unless a competent person
determines the resulting scaffold is structurally sound.
..1926.451(b)(11)
1926.451(b)(11)
Scaffold components made of dissimilar metals shall not be
used together unless a competent person has determined that galvanic
action will not reduce the strength of any component to a level below that
required by paragraph (a)(1) of this section.
1926.451(c)
"Criteria for supported scaffolds."
1926.451(c)(1)
Supported scaffolds with a height to base width (including
outrigger supports, if used) ratio of more than four to one (4:1) shall be
restrained from tipping by guying, tying, bracing, or equivalent means, as
follows:
1926.451(c)(1)(i)
Guys, ties, and braces shall be installed at locations
where horizontal members support both inner and outer legs.
1926.451(c)(1)(ii)
Guys, ties, and braces shall be installed according to the
scaffold manufacturer's recommendations or at the closest horizontal
member to the 4:1 height and be repeated vertically at locations of
horizontal members every 20 feet (6.1 m) or less thereafter for scaffolds
3 feet (0.91 m) wide or less, and every 26 feet (7.9 m) or less thereafter
for scaffolds greater than 3 feet (0.91 m) wide. The top guy, tie or brace
of completed scaffolds shall be placed no further than the 4:1 height from
the top. Such guys, ties and braces shall be installed at each end of the
scaffold and at horizontal intervals not to exceed 30 feet (9.1 m)
(measured from one end [not both] towards the other).
1926.451(c)(1)(iii)
Ties, guys, braces, or outriggers shall be used to prevent
the tipping of supported scaffolds in all circumstances where an eccentric
load, such as a cantilevered work platform, is applied or is transmitted
to the scaffold.
..1926.451(c)(2)
1926.451(c)(2)
Supported scaffold poles, legs, posts, frames, and
uprights shall bear on base plates and mud sills or other adequate firm
foundation.
1926.451(c)(2)(i)
Footings shall be level, sound, rigid, and capable of
supporting the loaded scaffold without settling or displacement.
1926.451(c)(2)(ii)
Unstable objects shall not be used to support scaffolds or
platform units.
1926.451(c)(2)(iii)
Unstable objects shall not be used as working
platforms.
1926.451(c)(2)(iv)
Front-end loaders and similar pieces of equipment shall
not be used to support scaffold platforms unless they have been
specifically designed by the manufacturer for such use.
1926.451(c)(2)(v)
Fork-lifts shall not be used to support scaffold platforms
unless the entire platform is attached to the fork and the fork-lift is
not moved horizontally while the platform is occupied.
1926.451(c)(3)
Supported scaffold poles, legs, posts, frames, and
uprights shall be plumb and braced to prevent swaying and
displacement.
..1926.451(d)
1926.451(d)
"Criteria for suspension scaffolds."
1926.451(d)(1)
All suspension scaffold support devices, such as outrigger
beams, cornice hooks, parapet clamps, and similar devices, shall rest on
surfaces capable of supporting at least 4 times the load imposed on them
by the scaffold operating at the rated load of the hoist (or at least 1.5
times the load imposed on them by the scaffold at the stall capacity of
the hoist, whichever is greater).
1926.451(d)(2)
Suspension scaffold outrigger beams, when used, shall be
made of structural metal or equivalent strength material, and shall be
restrained to prevent movement.
1926.451(d)(3)
The inboard ends of suspension scaffold outrigger beams
shall be stabilized by bolts or other direct connections to the floor or
roof deck, or they shall have their inboard ends stabilized by
counterweights, except masons' multi-point adjustable suspension scaffold
outrigger beams shall not be stabilized by counterweights.
1926.451(d)(3)(i)
Before the scaffold is used, direct connections shall be
evaluated by a competent person who shall confirm, based on the
evaluation, that the supporting surfaces are capable of supporting the
loads to be imposed. In addition, masons' multi-point adjustable
suspension scaffold connections shall be designed by an engineer
experienced in such scaffold design.
1926.451(d)(3)(ii)
Counterweights shall be made of non-flowable material.
Sand, gravel and similar materials that can be easily dislocated shall not
be used as counterweights.
..1926.451(d)(3)(iii)
1926.451(d)(3)(iii)
Only those items specifically designed as counterweights
shall be used to counterweight scaffold systems. Construction materials
such as, but not limited to, masonry units and rolls of roofing felt,
shall not be used as counterweights.
1926.451(d)(3)(iv)
Counterweights shall be secured by mechanical means to the
outrigger beams to prevent accidental displacement.
1926.451(d)(3)(v)
Counterweights shall not be removed from an outrigger beam
until the scaffold is disassembled.
1926.451(d)(3)(vi)
Outrigger beams which are not stabilized by bolts or other
direct connections to the floor or roof deck shall be secured by
tiebacks.
1926.451(d)(3)(vii)
Tiebacks shall be equivalent in strength to the suspension
ropes.
1926.451(d)(3)(viii)
Outrigger beams shall be placed perpendicular to its
bearing support (usually the face of the building or structure). However,
where the employer can demonstrate that it is not possible to place an
outrigger beam perpendicular to the face of the building or structure
because of obstructions that cannot be moved, the outrigger beam may be
placed at some other angle, provided opposing angle tiebacks are used.
..1926.451(d)(3)(ix)
1926.451(d)(3)(ix)
Tiebacks shall be secured to a structurally sound
anchorage on the building or structure. Sound anchorages include
structural members, but do not include standpipes, vents, other piping
systems, or electrical conduit.
1926.451(d)(3)(x)
Tiebacks shall be installed perpendicular to the face of
the building or structure, or opposing angle tiebacks shall be installed.
Single tiebacks installed at an angle are prohibited.
1926.451(d)(4)
Suspension scaffold outrigger beams shall be:
1926.451(d)(4)(i)
Provided with stop bolts or shackles at both ends;
1926.451(d)(4)(ii)
Securely fastened together with the flanges turned out
when channel iron beams are used in place of I-beams;
1926.451(d)(4)(iii)
Installed with all bearing supports perpendicular to the
beam center line;
1926.451(d)(4)(iv)
Set and maintained with the web in a vertical position;
and
1926.451(d)(4)(v)
When an outrigger beam is used, the shackle or clevis with
which the rope is attached to the outrigger beam shall be placed directly
over the center line of the stirrup.
1926.451(d)(5)
Suspension scaffold support devices such as cornice hooks,
roof hooks, roof irons, parapet clamps, or similar devices shall be:
..1926.451(d)(5)(i)
1926.451(d)(5)(i)
Made of steel, wrought iron, or materials of equivalent
strength;
1926.451(d)(5)(ii)
Supported by bearing blocks; and
1926.451(d)(5)(iii)
Secured against movement by tiebacks installed at right
angles to the face of the building or structure, or opposing angle
tiebacks shall be installed and secured to a structurally sound point of
anchorage on the building or structure. Sound points of anchorage include
structural members, but do not include standpipes, vents, other piping
systems, or electrical conduit.
1926.451(d)(5)(iv)
Tiebacks shall be equivalent in strength to the hoisting
rope.
1926.451(d)(6)
When winding drum hoists are used on a suspension
scaffold, they shall contain not less than four wraps of the suspension
rope at the lowest point of scaffold travel. When other types of hoists
are used, the suspension ropes shall be long enough to allow the scaffold
to be lowered to the level below without the rope end passing through the
hoist, or the rope end shall be configured or provided with means to
prevent the end from passing through the
hoist.
1926.451(d)(7)
The use of repaired wire rope as suspension rope is
prohibited.
..1926.451(d)(8)
1926.451(d)(8)
Wire suspension ropes shall not be joined together except
through the use of eye splice thimbles connected with shackles or
coverplates and bolts.
1926.451(d)(9)
The load end of wire suspension ropes shall be equipped
with proper size thimbles and secured by eyesplicing or equivalent
means.
1926.451(d)(10)
Ropes shall be inspected for defects by a competent person
prior to each workshift and after every occurrence which could affect a
rope's integrity. Ropes shall be replaced if any of the following
conditions exist:
1926.451(d)(10)(i)
Any physical damage which impairs the function and
strength of the rope.
1926.451(d)(10)(ii)
Kinks that might impair the tracking or wrapping of rope
around the drum(s) or sheave(s).
1926.451(d)(10)(iii)
Six randomly distributed broken wires in one rope lay or
three broken wires in one strand in one rope lay.
1926.451(d)(10)(iv)
Abrasion, corrosion, scrubbing, flattening or peening
causing loss of more than one-third of the original diameter of the
outside wires.
1926.451(d)(10)(v)
Heat damage caused by a torch or any damage caused by
contact with electrical wires.
..1926.451(d)(10)(vi)
1926.451(d)(10)(vi)
Evidence that the secondary brake has been activated
during an overspeed condition and has engaged the suspension rope.
1926.451(d)(11)
Swaged attachments or spliced eyes on wire suspension
ropes shall not be used unless they are made by the wire rope manufacturer
or a qualified person.
1926.451(d)(12)
When wire rope clips are used on suspension scaffolds:
1926.451(d)(12)(i)
There shall be a minimum of 3 wire rope clips installed,
with the clips a minimum of 6 rope diameters apart;
1926.451(d)(12)(ii)
Clips shall be installed according to the manufacturer's
recommendations;
1926.451(d)(12)(iii)
Clips shall be retightened to the manufacturer's
recommendations after the initial
loading;
1926.451(d)(12)(iv)
Clips shall be inspected and retightened to the
manufacturer's recommendations at the start of each workshift
thereafter;
1926.451(d)(12)(v)
U-bolt clips shall not be used at the point of suspension
for any scaffold hoist;
..1926.451(d)(12)(vi)
1926.451(d)(12)(vi)
When U-bolt clips are used, the U-bolt shall be placed
over the dead end of the rope, and the saddle shall be placed over the
live end of the rope.
1926.451(d)(13)
Suspension scaffold power-operated hoists and manual
hoists shall be tested by a qualified testing laboratory.
1926.451(d)(14)
Gasoline-powered equipment and hoists shall not be used on
suspension scaffolds.
1926.451(d)(15)
Gears and brakes of power-operated hoists used on
suspension scaffolds shall be enclosed.
1926.451(d)(16)
In addition to the normal operating brake, suspension
scaffold power-operated hoists and manually operated hoists shall have a
braking device or locking pawl which engages automatically when a hoist
makes either of the following uncontrolled movements: an instantaneous
change in momentum or an accelerated overspeed.
1926.451(d)(17)
Manually operated hoists shall require a positive crank
force to descend.
1926.451(d)(18)
Two-point and multi-point suspension scaffolds shall be
tied or otherwise secured to prevent them from swaying, as determined to
be necessary based on an evaluation by a competent person. Window
cleaners' anchors shall not be used for this purpose.
..1926.451(d)(19)
1926.451(d)(19)
Devices whose sole function is to provide emergency escape
and rescue shall not be used as working platforms. This provision does not
preclude the use of systems which are designed to function both as
suspension scaffolds and emergency systems.
1926.451(e)
"Access." This paragraph applies to scaffold access for
all employees. Access requirements for employees erecting or dismantling
supported scaffolds are specifically addressed in paragraph (e)(9) of this
section.
1926.451(e)(1)
When scaffold platforms are more than 2 feet (0.6 m) above
or below a point of access, portable ladders, hook-on ladders, attachable
ladders, stair towers (scaffold stairways/towers), stairway-type ladders
(such as ladder stands), ramps, walkways, integral prefabricated scaffold
access, or direct access from another scaffold, structure, personnel
hoist, or similar surface shall be used. Crossbraces shall not be used as
a means of access.
1926.451(e)(2)
Portable, hook-on, and attachable ladders (Additional
requirements for the proper construction and use of portable ladders are
contained in subpart X of this part -- Stairways and Ladders):
1926.451(e)(2)(i)
Portable, hook-on, and attachable ladders shall be
positioned so as not to tip the scaffold;
1926.451(e)(2)(ii)
Hook-on and attachable ladders shall be positioned so that
their bottom rung is not more than 24 inches (61 cm) above the scaffold
supporting level;
..1926.451(e)(2)(iii)
1926.451(e)(2)(iii)
When hook-on and attachable ladders are used on a
supported scaffold more than 35 feet (10.7 m) high, they shall have rest
platforms at 35-foot (10.7 m) maximum vertical intervals.
1926.451(e)(2)(iv)
Hook-on and attachable ladders shall be specifically
designed for use with the type of scaffold used;
1926.451(e)(2)(v)
Hook-on and attachable ladders shall have a minimum rung
length of 11 1/2 inches (29 cm); and
1926.451(e)(2)(vi)
Hook-on and attachable ladders shall have uniformly spaced
rungs with a maximum spacing between rungs of 16 3/4 inches.
1926.451(e)(3)
Stairway-type ladders
shall:
1926.451(e)(3)(i)
Be positioned such that their bottom step is not more than
24 inches (61 cm) above the scaffold supporting level;
1926.451(e)(3)(ii)
Be provided with rest platforms at 12 foot (3.7 m) maximum
vertical intervals;
1926.451(e)(3)(iii)
Have a minimum step width of 16 inches (41 cm), except
that mobile scaffold stairway-type ladders shall have a minimum step width
of 11 1/2 inches (30 cm); and
1926.451(e)(3)(iv)
Have slip-resistant treads on all steps and landings.
..1926.451(e)(4)
1926.451(e)(4)
Stairtowers (scaffold stairway/towers) shall be positioned
such that their bottom step is not more than 24 inches (61 cm.) above the
scaffold supporting level.
1926.451(e)(4)(i)
A stairrail consisting of a toprail and a midrail shall be
provided on each side of each scaffold stairway.
1926.451(e)(4)(ii)
The toprail of each stairrail system shall also be capable
of serving as a handrail, unless a separate handrail is provided.
1926.451(e)(4)(iii)
Handrails, and toprails that serve as handrails, shall
provide an adequate handhold for employees grasping them to avoid
falling.
1926.451(e)(4)(iv)
Stairrail systems and handrails shall be surfaced to
prevent injury to employees from punctures or lacerations, and to prevent
snagging of clothing.
1926.451(e)(4)(v)
The ends of stairrail systems and handrails shall be
constructed so that they do not constitute a projection hazard.
1926.451(e)(4)(vi)
Handrails, and toprails that are used as handrails, shall
be at least 3 inches (7.6 cm) from other objects.
..1926.451(e)(4)(vii)
1926.451(e)(4)(vii)
Stairrails shall be not less than 28 inches (71 cm) nor
more than 37 inches (94 cm) from the upper surface of the stairrail to the
surface of the tread, in line with the face of the riser at the forward
edge of the tread.
1926.451(e)(4)(viii)
A landing platform at least 18 inches (45.7 cm) wide by at
least 18 inches (45.7 cm) long shall be provided at each level.
1926.451(e)(4)(ix)
Each scaffold stairway shall be at least 18 inches (45.7
cm) wide between stairrails.
1926.451(e)(4)(x)
Treads and landings shall have slip-resistant
surfaces.
1926.451(e)(4)(xi)
Stairways shall be installed between 40 degrees and 60
degrees from the horizontal.
1926.451(e)(4)(xii)
Guardrails meeting the requirements of paragraph (g)(4) of
this section shall be provided on the open sides and ends of each
landing.
1926.451(e)(4)(xiii)
Riser height shall be uniform, within 1/4 inch, (0.6 cm)
for each flight of stairs. Greater variations in riser height are allowed
for the top and bottom steps of the entire system, not for each flight of
stairs.
1926.451(e)(4)(xiv)
Tread depth shall be uniform, within 1/4 inch, for each
flight of stairs.
..1926.451(e)(5)
1926.451(e)(5)
Ramps and walkways.
1926.451(e)(5)(i)
Ramps and walkways 6 feet (1.8 m) or more above lower
levels shall have guardrail systems which comply with subpart M of this
part -- Fall Protection;
1926.451(e)(5)(ii)
No ramp or walkway shall be inclined more than a slope of
one (1) vertical to three (3) horizontal (20 degrees above the
horizontal).
1926.451(e)(5)(iii)
If the slope of a ramp or a walkway is steeper than one
(1) vertical in eight (8) horizontal, the ramp or walkway shall have
cleats not more than fourteen (14) inches (35 cm) apart which are securely
fastened to the planks to provide footing.
1926.451(e)(6)
Integral prefabricated scaffold access frames shall:
1926.451(e)(6)(i)
Be specifically designed and constructed for use as ladder
rungs;
1926.451(e)(6)(ii)
Have a rung length of at least 8 inches (20 cm);
1926.451(e)(6)(iii)
Not be used as work platforms when rungs are less than 11
1/2 inches in length, unless each affected employee uses fall protection,
or a positioning device, which complies with 1926.502;
1926.451(e)(6)(iv)
Be uniformly spaced within each frame section;
..1926.451(e)(6)(v)
1926.451(e)(6)(v)
Be provided with rest platforms at 35-foot (10.7 m)
maximum vertical intervals on all supported scaffolds more than 35 feet
(10.7 m) high; and
1926.451(e)(6)(vi)
Have a maximum spacing between rungs of 16 3/4 inches (43
cm). Non-uniform rung spacing caused by joining end frames together is
allowed, provided the resulting spacing does not exceed 16 3/4 inches (43
cm).
1926.451(e)(7)
Steps and rungs of ladder and stairway type access shall
line up vertically with each other between rest platforms.
1926.451(e)(8)
Direct access to or from another surface shall be used
only when the scaffold is not more than 14 inches (36 cm) horizontally and
not more than 24 inches (61 cm) vertically from the other surface.
1926.451(e)(9)
Effective September 2, 1997, access for employees erecting
or dismantling supported scaffolds shall be in accordance with the
following:
..1926.451(e)(9)(i)
1926.451(e)(9)(i)
The employer shall provide safe means of access for each
employee erecting or dismantling a scaffold where the provision of safe
access is feasible and does not create a greater hazard. The employer
shall have a competent person determine whether it is feasible or would
pose a greater hazard to provide, and have employees use a safe means of
access. This determination shall be based on site conditions and the type
of scaffold being erected or dismantled.
1926.451(e)(9)(ii)
Hook-on or attachable ladders shall be installed as soon
as scaffold erection has progressed to a point that permits safe
installation and use.
1926.451(e)(9)(iii)
When erecting or dismantling tubular welded frame
scaffolds, (end) frames, with horizontal members that are parallel, level
and are not more than 22 inches apart vertically may be used as climbing
devices for access, provided they are erected in a manner that creates a
usable ladder and provides good hand hold and foot space.
1926.451(e)(9)(iv)
Cross braces on tubular welded frame scaffolds shall not
be used as a means of access or egress.
1926.451(f)
"Use."
1926.451(f)(1)
Scaffolds and scaffold components shall not be loaded in
excess of their maximum intended loads or rated capacities, whichever is
less.
1926.451(f)(2)
The use of shore or lean-to scaffolds is prohibited.
..1926.451(f)(3)
1926.451(f)(3)
Scaffolds and scaffold components shall be inspected for
visible defects by a competent person before each work shift, and after
any occurrence which could affect a scaffold's structural integrity.
1926.451(f)(4)
Any part of a scaffold damaged or weakened such that its
strength is less than that required by paragraph (a) of this section shall
be immediately repaired or replaced, braced to meet those provisions, or
removed from service until repaired.
1926.451(f)(5)
Scaffolds shall not be moved horizontally while employees
are on them, unless they have been designed by a registered professional
engineer specifically for such movement or, for mobile scaffolds, where
the provisions of 1926.452(w) are followed.
1926.451(f)(6)
The clearance between scaffolds and power lines shall be
as follows: Scaffolds shall not be erected, used, dismantled, altered, or
moved such that they or any conductive material handled on them might come
closer to exposed and energized power lines than as follows: *Insulated Lines
_____________________________________________________________________
| |
Voltage | Minimum distance | Alternatives
____________________|________________________|_______________________
| |
Less than 300 volts.| 3 feet (0.9 m) |
300 volts to 50 kv.| 10 feet (3.1 m) |
More than 50 kv.....| 10 feet (3.1 m) plus | 2 times the length
| 0.4 inches (1.0 cm) | of the line
| for each 1 kv over | insulator, but never
| 50 kv. | less than 10
| | feet (3.1 m).
____________________|________________________|_______________________
*Uninsulated lines
_____________________________________________________________________
| |
Voltage | Minimum distance | Alternatives
____________________|________________________|_______________________
| |
Less than 50 kv.....| 10 feet (3.1 m). |
More than 50 kv.....| 10 feet (3.1 m) plus | 2 times the length of
| 0.4 inches (1.0 cm) | the line insulator,
| for each 1 kv over | but never less than
| 50 kv. | 10 feet (3.1 m).
____________________|________________________|_______________________
Exception to paragraph (f)(6): Scaffolds and materials may
be closer to power lines than specified above where such clearance is
necessary for performance of work, and only after the utility company, or
electrical system operator, has been notified of the need to work closer
and the utility company, or electrical system operator, has deenergized
the lines, relocated the lines, or installed protective coverings to
prevent accidental contact with the lines.
1926.451(f)(7)
Scaffolds shall be erected, moved, dismantled, or altered
only under the supervision and direction of a competent person qualified
in scaffold erection, moving, dismantling or alteration. Such activities
shall be performed only by experienced and trained employees selected for
such work by the competent person.
..1926.451(f)(8)
1926.451(f)(8)
Employees shall be prohibited from working on scaffolds
covered with snow, ice, or other slippery material except as necessary for
removal of such materials.
1926.451(f)(9)
Where swinging loads are being hoisted onto or near
scaffolds such that the loads might contact the scaffold, tag lines or
equivalent measures to control the loads shall be used.
1926.451(f)(10)
Suspension ropes supporting adjustable suspension
scaffolds shall be of a diameter large enough to provide sufficient
surface area for the functioning of brake and hoist mechanisms.
1926.451(f)(11)
Suspension ropes shall be shielded from heat-producing
processes. When acids or other corrosive substances are used on a
scaffold, the ropes shall be shielded, treated to protect against the
corrosive substances, or shall be of a material that will not be damaged
by the substance being used.
1926.451(f)(12)
Work on or from scaffolds is prohibited during storms or
high winds unless a competent person has determined that it is safe for
employees to be on the scaffold and those employees are protected by a
personal fall arrest system or wind screens. Wind screens shall not be
used unless the scaffold is secured against the anticipated wind forces
imposed.
1926.451(f)(13)
Debris shall not be allowed to accumulate on
platforms.
..1926.451(f)(14)
1926.451(f)(14)
Makeshift devices, such as but not limited to boxes and
barrels, shall not be used on top of scaffold platforms to increase the
working level height of employees.
1926.451(f)(15)
Ladders shall not be used on scaffolds to increase the
working level height of employees, except on large area scaffolds where
employers have satisfied the following criteria:
1926.451(f)(15)(i)
When the ladder is placed against a structure which is not
a part of the scaffold, the scaffold shall be secured against the sideways
thrust exerted by the ladder;
1926.451(f)(15)(ii)
The platform units shall be secured to the scaffold to
prevent their movement;
1926.451(f)(15)(iii)
The ladder legs shall be on the same platform or other
means shall be provided to stabilize the ladder against unequal platform
deflection, and
1926.451(f)(15)(iv)
The ladder legs shall be secured to prevent them from
slipping or being pushed off the platform.
1926.451(f)(16)
Platforms shall not deflect more than 1/60 of the span
when loaded.
1926.451(f)(17)
To reduce the possibility of welding current arcing
through the suspension wire rope when performing welding from suspended
scaffolds, the following precautions shall be taken, as applicable:
..1926.451(f)(17)(i)
1926.451(f)(17)(i)
An insulated thimble shall be used to attach each
suspension wire rope to its hanging support (such as cornice hook or
outrigger). Excess suspension wire rope and any additional independent
lines from grounding shall be insulated;
1926.451(f)(17)(ii)
The suspension wire rope shall be covered with insulating
material extending at least 4 feet (1.2 m) above the hoist. If there is a
tail line below the hoist, it shall be insulated to prevent contact with
the platform. The portion of the tail line that hangs free below the
scaffold shall be guided or retained, or both, so that it does not become
grounded;
1926.451(f)(17)(iii)
Each hoist shall be covered with insulated protective
covers;
1926.451(f)(17)(iv)
In addition to a work lead attachment required by the
welding process, a grounding conductor shall be connected from the
scaffold to the structure. The size of this conductor shall be at least
the size of the welding process work lead, and this conductor shall not be
in series with the welding process or the work piece;
1926.451(f)(17)(v)
If the scaffold grounding lead is disconnected at any
time, the welding machine shall be shut off; and
1926.451(f)(17)(vi)
An active welding rod or uninsulated welding lead shall
not be allowed to contact the scaffold or its suspension system.
..1926.451(g)
1926.451(g)
"Fall protection."
1926.451(g)(1)
Each employee on a scaffold more than 10 feet (3.1 m)
above a lower level shall be protected from falling to that lower level.
Paragraphs (g)(1)(i) through (vii) of this section establish the types of
fall protection to be provided to the employees on each type of scaffold.
Paragraph (g)(2) of this section addresses fall protection for scaffold
erectors and dismantlers.
Note to paragraph (g)(1): The fall protection requirements
for employees installing suspension scaffold support systems on floors,
roofs, and other elevated surfaces are set forth in subpart M of this
part.
1926.451(g)(1)(i)
Each employee on a boatswains' chair, catenary scaffold,
float scaffold, needle beam scaffold, or ladder jack scaffold shall be
protected by a personal fall arrest
system;
1926.451(g)(1)(ii)
Each employee on a single-point or two-point adjustable
suspension scaffold shall be protected by both a personal fall arrest
system and guardrail system;
1926.451(g)(1)(iii)
Each employee on a crawling board (chicken ladder) shall
be protected by a personal fall arrest system, a guardrail system (with
minimum 200 pound toprail capacity), or by a three-fourth inch (1.9 cm)
diameter grabline or equivalent handhold securely fastened beside each
crawling board;
1926.451(g)(1)(iv)
Each employee on a self-contained adjustable scaffold
shall be protected by a guardrail system (with minimum 200 pound toprail
capacity) when the platform is supported by the frame structure, and by
both a personal fall arrest system and a guardrail system (with minimum
200 pound toprail capacity) when the platform is supported by ropes;
..1926.451(g)(1)(v)
1926.451(g)(1)(v)
Each employee on a walkway located within a scaffold shall
be protected by a guardrail system (with minimum 200 pound toprail
capacity) installed within 9 1/2 inches (24.1 cm) of and along at least
one side of the walkway.
1926.451(g)(1)(vi)
Each employee performing overhand bricklaying operations
from a supported scaffold shall be protected from falling from all open
sides and ends of the scaffold (except at the side next to the wall being
laid) by the use of a personal fall arrest system or guardrail system
(with minimum 200 pound toprail
capacity).
1926.451(g)(1)(vii)
For all scaffolds not otherwise specified in paragraphs
(g)(1)(i) through (g)(1)(vi) of this section, each employee shall be
protected by the use of personal fall arrest systems or guardrail systems
meeting the requirements of paragraph (g)(4) of this section.
1926.451(g)(2)
Effective September 2, 1997, the employer shall have a
competent person determine the feasibility and safety of providing fall
protection for employees erecting or dismantling supported scaffolds.
Employers are required to provide fall protection for employees erecting
or dismantling supported scaffolds where the installation and use of such
protection is feasible and does not create a greater hazard.
..1926.451(g)(3)
1926.451(g)(3)
In addition to meeting the requirements of 1926.502(d),
personal fall arrest systems used on scaffolds shall be attached by
lanyard to a vertical lifeline, horizontal lifeline, or scaffold
structural member. Vertical lifelines shall not be used when overhead
components, such as overhead protection or additional platform levels, are
part of a single-point or two-point adjustable suspension scaffold.
1926.451(g)(3)(i)
When vertical lifelines are used, they shall be fastened
to a fixed safe point of anchorage, shall be independent of the scaffold,
and shall be protected from sharp edges and abrasion. Safe points of
anchorage include structural members of buildings, but do not include
standpipes, vents, other piping systems, electrical conduit, outrigger
beams, or counterweights.
1926.451(g)(3)(ii)
When horizontal lifelines are used, they shall be secured
to two or more structural members of the scaffold, or they may be looped
around both suspension and independent suspension lines (on scaffolds so
equipped) above the hoist and brake attached to the end of the scaffold.
Horizontal lifelines shall not be attached only to the suspension
ropes.
1926.451(g)(3)(iii)
When lanyards are connected to horizontal lifelines or
structural members on a single-point or two-point adjustable suspension
scaffold, the scaffold shall be equipped with additional independent
support lines and automatic locking devices capable of stopping the fall
of the scaffold in the event one or both of the suspension ropes fail. The
independent support lines shall be equal in number and strength to the
suspension ropes.
..1926.451(g)(3)(iv)
1926.451(g)(3)(iv)
Vertical lifelines, independent support lines, and
suspension ropes shall not be attached to each other, nor shall they be
attached to or use the same point of anchorage, nor shall they be attached
to the same point on the scaffold or personal fall arrest system.
1926.451(g)(4)
Guardrail systems installed to meet the requirements of
this section shall comply with the following provisions (guardrail systems
built in accordance with Appendix A to this subpart will be deemed to meet
the requirements of paragraphs (g)(4)(vii), (viii), and (ix) of this
section):
1926.451(g)(4)(i)
Guardrail systems shall be installed along all open sides
and ends of platforms. Guardrail systems shall be installed before the
scaffold is released for use by employees other than erection/dismantling
crews.
1926.451(g)(4)(ii)
The top edge height of toprails or equivalent member on
supported scaffolds manufactured or placed in service after January 1,
2000 shall be installed between 38 inches (0.97 m) and 45 inches (1.2 m)
above the platform surface. The top edge height on supported scaffolds
manufactured and placed in service before January 1, 2000, and on all
suspended scaffolds where both a guardrail and a personal fall arrest
system are required shall be between 36 inches (0.9 m) and 45 inches (1.2
m). When conditions warrant, the height of the top edge may exceed the
45-inch height, provided the guardrail system meets all other criteria of
paragraph (g)(4).
..1926.451(g)(4)(iii)
1926.451(g)(4)(iii)
When midrails, screens, mesh, intermediate vertical
members, solid panels, or equivalent structural members are used, they
shall be installed between the top edge of the guardrail system and the
scaffold platform.
1926.451(g)(4)(iv)
When midrails are used, they shall be installed at a
height approximately midway between the top edge of the guardrail system
and the platform surface.
1926.451(g)(4)(v)
When screens and mesh are used, they shall extend from the
top edge of the guardrail system to the scaffold platform, and along the
entire opening between the supports.
1926.451(g)(4)(vi)
When intermediate members (such as balusters or additional
rails) are used, they shall not be more than 19 inches (48 cm) apart.
1926.451(g)(4)(vii)
Each toprail or equivalent member of a guardrail system
shall be capable of withstanding, without failure, a force applied in any
downward or horizontal direction at any point along its top edge of at
least 100 pounds (445 n) for guardrail systems installed on single-point
adjustable suspension scaffolds or two-point adjustable suspension
scaffolds, and at least 200 pounds (890 n) for guardrail systems installed
on all other scaffolds.
1926.451(g)(4)(viii)
When the loads specified in paragraph (g)(4)(vii) of this
section are applied in a downward direction, the top edge shall not drop
below the height above the platform surface that is prescribed in
paragraph (g)(4)(ii) of this section.
..1926.451(g)(4)(ix)
1926.451(g)(4)(ix)
Midrails, screens, mesh, intermediate vertical members,
solid panels, and equivalent structural members of a guardrail system
shall be capable of withstanding, without failure, a force applied in any
downward or horizontal direction at any point along the midrail or other
member of at least 75 pounds (333 n) for guardrail systems with a minimum
100 pound toprail capacity, and at least 150 pounds (666 n) for guardrail
systems with a minimum 200 pound toprail capacity.
1926.451(g)(4)(x)
Suspension scaffold hoists and non-walk-through stirrups
may be used as end guardrails, if the space between the hoist or stirrup
and the side guardrail or structure does not allow passage of an employee
to the end of the scaffold.
1926.451(g)(4)(xi)
Guardrails shall be surfaced to prevent injury to an
employee from punctures or lacerations, and to prevent snagging of
clothing.
1926.451(g)(4)(xii)
The ends of all rails shall not overhang the terminal
posts except when such overhang does not constitute a projection hazard to
employees.
1926.451(g)(4)(xiii)
Steel or plastic banding shall not be used as a toprail or
midrail.
1926.451(g)(4)(xiv)
Manila or plastic (or other synthetic) rope being used for
toprails or midrails shall be inspected by a competent person as
frequently as necessary to ensure that it continues to meet the strength
requirements of paragraph (g) of this section.
..1926.451(g)(4)(xv)
1926.451(g)(4)(xv)
Crossbracing is acceptable in place of a midrail when the
crossing point of two braces is between 20 inches (0.5 m) and 30 inches
(0.8 m) above the work platform or as a toprail when the crossing point of
two braces is between 38 inches (0.97 m) and 48 inches (1.3 m) above the
work platform. The end points at each upright shall be no more than 48
inches (1.3 m) apart.
1926.451(h)
"Falling object protection."
1926.451(h)(1)
In addition to wearing hardhats each employee on a
scaffold shall be provided with additional protection from falling hand
tools, debris, and other small objects through the installation of
toeboards, screens, or guardrail systems, or through the erection of
debris nets, catch platforms, or canopy structures that contain or deflect
the falling objects. When the falling objects are too large, heavy or
massive to be contained or deflected by any of the above-listed measures,
the employer shall place such potential falling objects away from the edge
of the surface from which they could fall and shall secure those materials
as necessary to prevent their falling.
1926.451(h)(2)
Where there is a danger of tools, materials, or equipment
falling from a scaffold and striking employees below, the following
provisions apply:
1926.451(h)(2)(i)
The area below the scaffold to which objects can fall
shall be barricaded, and employees shall not be permitted to enter the
hazard area; or
..1926.451(h)(2)(ii)
1926.451(h)(2)(ii)
A toeboard shall be erected along the edge of platforms
more than 10 feet (3.1 m) above lower levels for a distance sufficient to
protect employees below, except on float (ship) scaffolds where an edging
of 3/4 x 1 1/2 inch (2 x 4 cm) wood or equivalent may be used in lieu of
toeboards;
1926.451(h)(2)(iii)
Where tools, materials, or equipment are piled to a height
higher than the top edge of the toeboard, paneling or screening extending
from the toeboard or platform to the top of the guardrail shall be erected
for a distance sufficient to protect employees below; or
1926.451(h)(2)(iv)
A guardrail system shall be installed with openings small
enough to prevent passage of potential falling objects; or
1926.451(h)(2)(v)
A canopy structure, debris net, or catch platform strong
enough to withstand the impact forces of the potential falling objects
shall be erected over the employees below.
1926.451(h)(3)
Canopies, when used for falling object protection, shall
comply with the following criteria:
1926.451(h)(3)(i)
Canopies shall be installed between the falling object
hazard and the employees.
..1926.451(h)(3)(ii)
1926.451(h)(3)(ii)
When canopies are used on suspension scaffolds for falling
object protection, the scaffold shall be equipped with additional
independent support lines equal in number to the number of points
supported, and equivalent in strength to the strength of the suspension
ropes.
1926.451(h)(3)(iii)
Independent support lines and suspension ropes shall not
be attached to the same points of anchorage.
1926.451(h)(4)
Where used, toeboards shall be:
1926.451(h)(4)(i)
Capable of withstanding, without failure, a force of at
least 50 pounds (222 n) applied in any downward or horizontal direction at
any point along the toeboard (toeboards built in accordance with Appendix
A to this subpart will be deemed to meet this requirement); and
1926.451(h)(4)(ii)
At least three and one-half inches (9 cm) high from the
top edge of the toeboard to the level of the walking/working surface.
Toeboards shall be securely fastened in place at the outermost edge of the
platform and have not more than 1/4 inch (0.7 cm) clearance above the
walking/working surface. Toeboards shall be solid or with openings not
over one inch (2.5 cm) in the greatest dimension.
[44 FR 8577, Feb. 9, 1979; 44 FR 20940, Apr. 6, 1979, as
amended at 58 FR 35182 and 35310, June 30, 1993; 61 FR 46025, Aug. 30
1996; 61 FR 59831, Nov. 25, 1996] |