R 408.10753 Materials.

Rule 753.(1) Wood guards may be used if the presence of fumes or if manufacturing conditions cause rapid deterioration of metal guards, in construction work, and in locations outdoors if extreme cold or extreme heat makes metal guards and railings undesirable. (2) Material sizes and clearances shall be pursuant to table A. See Figure 2, and Appendices A and B. (3) Table A reads as follows: TABLE A STANDARD MATERIALS AND DIMENSIONS FOR MACHINERY GUARDS Size and Clearance of Filler Materials Material Clearance From Moving Part At All Points (Inches) Largest Mesh or Opening Allowable B (Inches) Minimum Gauge (U.S. Standard) Or Thickness Woven Wire Under 2 2-4 4-15 3/8 1/2 2 No. 16-1/8 In. No. 16-1/2 No. 12-2 Expanded Metal Under 4 4-15 1/2 2 No. 18-1/2 In. No. 13-2 Perforated Metal Under 4 4-15 1/2 2 No. 20-1/2 In. No. 14-2 Sheet Metal Under 4 4-15 - - - No. 22 No. 22 Wood Or Metal Strips Crossed } Under 4 4-15 1/2 2 } 3/4 In. Wood Or No. 16 Metal Wood Or Metal Strips Not Crossed } Under 4 4-15 1/2 The Width One Width Plywood, Plastic Or Equivalent Under 4 4-15 - - - 1/4 In. 1/4 In. Standard Railing Min. 15 Max. 20 - - - - - -