R 408.14463 Sand mixers.

Rule 4463. (1) A bowl or drum-type sand mixer shall have a grating which is made of 3/8-inch rod or a material of equal strength with openings as prescribed in table 1 and which covers the opening and is interlocked to the mixer. When the cover is raised, the motor shall not start again until the cover is closed and the starter button activated. (2) Table 1 reads as follows: TABLE 1 Distance of Opening From Maximum Width Opening Point of Operation Hazard (inches) (inches) 1/2 to 1 1/2................ 1/4 More than 1 1/2 to 2 1/2.............. 3/8 More than 2 1/2 to 3 1/2.............. 1/2 More than 3 1/2 to 5 1/2.............. 5/8 More than 5 1/2 to 6 1/2.............. 3/4 More than 6 1/2 to 7 1/2.............. 7/8 More than 7 1/2 to 12 1/2............. 1 1/4 More than 12 1/2 to 15 1/2............ 1 1/2 More than 15 1/2 to 17 1/2............ 1 7/8 More than 17 1/2 to 31 1/2............ 2 1/8