Guarding line or distance of opening from point of operation hazard (inches) | Maximum width of opening (inches) |
1/2 to 1 1/2 | 1/4 |
1 1/2 to 2 1/2 | 3/8 |
2 1/2 to 3 1/2 | 1/2 |
3 1/2 to 5 1/2 | 5/8 |
5 1/2 to 6 1/2 | 3/4 |
6 1/2 to 7 1/2 | 7/8 |
7 1/2 to 12 1/2 | 1 1/4 |
12 1/2 to 15 1/2 | 1 1/2 |
15 1/2 to 17 1/2 | 1 7/8 |
17 1/2 to 31 1/2 | 2 1/8 |