Wash. Admin. Code § 296-307-28060

Current through Register Vol. 24-23, December 1, 2024

Section 296-307-28060 - Materials used for guardrails and toeboards

(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. 12

Expanded metal

Under 4

4-15

1/2

No. 18

No. 13

Perforated metal

Under 4

4-15

1/2

No. 20

No. 14

Sheet metal

Under 4

4-15

No. 22

Wood or metal strip crossed

Under 4

4-15

3/8

Wood 3/4

Metal No. 16

Wood 3/4

Metal No. 16

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

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"

Wash. Admin. Code § 296-307-28060

Amended by WSR 20-21-091, Filed 10/20/2020, effective 11/20/2020

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.