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| # | Regulations |
|---|---|
| 1 | - - Underground Construction |
| # | Letters of Interpretation |
|---|---|
| 1 | - 1926.800(c) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. |
| 2 | - 1926.800(c) - Positive identification of persons working underground in tunnels and shafts, caissons, cofferdams, compressed air tunnels. |
| 3 | - 1926.800(c) - Use of Mapp gas, oxygen, and acetylene in a tunnel. |
