Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › INDOOR OPERATIONS › Part P - Guarding Power Transmission Machinery › Section 296-307-28060 - Materials used for guardrails and toeboards

Current through Register Vol. 24-14, July 15, 2024
(1) A guardrail used to guard power
				  transmission parts must be 42 inches tall, with a midrail between the top rail
				  and the floor.
(2) Posts must be 8
				  feet apart or less. They must be permanent and substantial, smooth, and free
				  from protruding nails, bolts, and splinters. If made of pipe, the post must be
				  at least 1-1/4 inches inside diameter. If posts are made of metal shapes or
				  bars, the section must be as strong as posts made of 1-1/2 by 1-1/2 by
				  3/16-inch angle iron. If posts are made of wood, the posts must be at least 2
				  by 4 inches. The upper rail must be 2 by 4 inches, or two 1 by 4 inch strips,
				  one at the top and one at the side of the posts. The midrail must be at least 1
				  by 4 inches.
(3) The rails (metal
				  shapes, metal bars, or wood), should be on the side of the posts that gives the
				  best protection and support. Where panels are fitted with expanded metal or
				  wire mesh (as noted in Table 1) the middle rails may be omitted. Where guard is
				  exposed to contact with moving equipment, additional strength may be
				  necessary.
(4) Toeboards must be at
				  least 4 inches tall, of wood, metal, or metal grill of a maximum 1-inch mesh.
				  Toeboards at flywheel pits should be placed as close to edge of the pit as
				  possible.
Table P-1
TABLE OF STANDARD MATERIALS AND DIMENSIONS
Material
Clearance from moving part at all points (inches)
Largest mesh or opening allowable (inches)
Minimum gauge (U.S. Standard) or thickness
								(inches)
Minimum height of guard from floor or platform
								level (feet)
Woven wire
Under 2
2-4
Under 4
4-15
3/8
1/2
1/2 2
No. 16
No. 16
No. 16
No. 12
7
7
7
7
Expanded metal
Under 4
4-15
1/2
2
No. 18
No. 13
7
7
Perforated metal
Under 4
4-15
1/2
2
No. 20
No. 14
7
7
Sheet metal
Under 4
4-15
No. 22
No. 22
7
7
Wood or metal strip crossed
Under 4
4-15
3/8
2
Wood 3/4
Metal No. 16
Wood 3/4
Metal No. 16
7
7
Wood or metal strip not crossed
Under 4
4-15
1/2 width
1 width
Wood 3/4
Metal No. 16
Wood 3/4
Metal No. 16
7
7
Standard rail
Min. 15 Max. 20
Table P-2
HORIZONTAL OVERHEAD BELTS, ROPES, AND CHAINS 7 FEET OR MORE
					 ABOVE FLOOR OR PLATFORM
Width 0"-14" inclusive
Material
MEMBERS
Framework
1 1/2" x 1 1/2" x 1/4"
Angle iron
Filler (belt guards)
1 1/2" x 3/16"
Flat iron
Filler and vertical side member
No. 20 A.W.G.
Solid sheet metal
Filler supports
2" x 5/16" flat iron
Flat and angle
Guard supports
2" x 5/16"
Flat iron
FASTENINGS
Filler supports to framework
(2) 3/16"
Rivets
Filler flats to supports (belt guards)
(1) 5/16"
Flush rivets
Filler to frame and supports (chain guards)
3/16"
Rivets spaced
Guard supports to framework
(2) 3/6"
Rivets or bolts
Guard and supports to overheard ceiling
1/4" x 3 1/2" lag screws or 1/2" bolts
Lag screws or bolts
DETAILS-SPACING, ETC.
Width of guards
Spacing between filler supports
Spacing between filler flats (belt guards)
One-quarter wider than belt, rope, or chain
								drive
20" center to center
2" apart
Width 0"-14" inclusive
Material
Spacing between guard supports
36" center to center
OTHER BELT GUARD FILLING PERMITTED
Sheet metal fastened as in chain guards
Woven Wire, 2" mesh
No. 20 A.W.G.
No. 12 A.W.G.
Solid or perforated
CLEARANCE FROM OUTSIDE OF BELT, ROPE, OR CHAIN
								DRIVE TO GUARD
Distance center to center of shafts
Up to 15' inclusive
Over 40'
Clearance from belt, or chain to guard
16"
120"
Width over 14" to 24" inclusive
Material
MEMBERS
Framework
2" x 2" x 5/16"
Angle iron
Filler (belt guards)
2" x 3/16"
Flat iron
Filler and vertical side member
No. 18 A.W.G.
Solid sheet metal
Filler supports
2" x 3/8" flat iron
Flat and angle
Guard supports
2" x 3/8"
Flat iron
FASTENINGS
Filler supports to framework
(2) 3/6"
Rivets
Filler flats to supports (belt guards)
(1) 5/16"
Flush rivets
Filler to frame and supports (chain guards)
8" centers on sides and 4" centers on bottom
Guard supports to framework
(2) 7/16"
Rivets or bolts
Guard and supports to overheard ceiling
5/8" x 4" lag screws or 5/8" bolts
Lag screws or bolts
DETAILS-SPACING, ETC.
Width of guards
Spacing between filler supports
16" C. to C
Spacing between filler flats (belt guards)
2 1/2" apart
Spacing between guard supports
36" C. to C
OTHER BELT GUARD FILLING PERMITTED
Sheet metal fastened as in chain guards
No. 18 A.W.G.
Solid or perforated
Woven wire, 2" mesh
No. 10 A.W.G.
CLEARANCE FROM OUTSIDE OF BELT, ROPE, OR CHAIN
								DRIVE TO GUARD
Distance center to center of shafts
Over 15' to 25'
Over 40' inclusive
Clearance from belt/chain to guard
10"
20"
Width over 24"
Material
MEMBERS
Framework
3" x 3" x 3/8"
Angle iron
Filler (belt guards)
2" x 5/16"
Flat iron
Filler and vertical side member
No. A.W.G.
Solid sheet metal
Filler supports
2 1/2" x 2 1/2" x 1/4" angle
Flat and angle
Guard supports
2 1/2" x 3/8"
Flat iron
FASTENINGS
Filler supports to framework
(3) 1/2"
Rivets
Filler flats to supports (belt guards)
(2) 3/8"
Flush rivets
Filler to frame and supports (chain guards)
Width 0"-14" inclusive
Material
Guard supports to frame work Guard and supports to
								overhead ceiling
(2) 5/8" 3/4" x 6" lag screws or 3/4" bolt
Rivets or bolts Lag screws or bolts
DETAILS-SPACING, ETC.
Width of guards
Spacing between filler supports
16" C. to C.
Spacing between filler flats (belt guards)
4" apart
Spacing between guard supports
36" C. to C.
OTHER BELT GUARD FILLING PERMITTED
Sheet metal fastened as in chain guards
No. 18 A.W.G.
Solid or perforated
Woven wire, 2" mesh
No. 8 A.W.G.
CLEARANCE FROM OUTSIDE OF BELT, ROPE, OR CHAIN
								DRIVE TO GUARD
Distance center to center of shafts
Over 25' to 40' inclusive
Over 40'
Clearance from belt, or chain to guard
15"
20"
Statutory Authority:
						RCW
						 49.17.040. 98-24-096, § 296-307-28060,
						filed 12/1/98, effective 3/1/99. 97-09-013, recodified as § 296-307-28060,
						filed 4/7/97, effective 4/7/97. Statutory Authority:
						RCW
						 49.17.040, [49.17.]050 and[49.17.]060 .
						96-22-048, § 296-306A-28060, filed 10/31/96, effective
						12/1/96.