WAC 296-307-28044. Materials required to use standard guards

(1) Standard guards must be made of the following materials: (a) Expanded metal; (b) Perforated or solid sheet metal; (c) Wire mesh on a frame of angle iron; or (d) Iron pipe securely fastened to the floor or the frame of the machine. (2) Wire mesh should have wires that are securely fastened at every cross point either by welding, soldering, or galvanizing. Exception: Diamond or square wire mesh made of No. 14 gauge wire, 3/4-inch mesh or heavier is exempt from this requirement.