This standard establishes safety requirements pertaining to the construction of tunnels, shafts and caissons. The requirements set forth in this standard cover environmental control; related facilities; fire prevention; hoisting; haulage; electrical, drilling and blasting; and compressed air work. This standard is not intended for application to mining or quarrying operations.

Table of Contents

    1. General
        1.1 Scope
        1.2 Purpose
        1.3 Exceptions
    2. References Standards
        2.1 Related American National Standards
        2.2 Other Standards
    3. Definitions
    4. General Provisions
        4.1 Accident Prevention Program
        4.2 Inspection and Maintenance of Excavations
        4.3 Access
        4.4 Existing Utilities
        4.5 Safety Precautions
        4.6 Protection Against Flooding
        4.7 Protection of Openings
        4.8 Structural Adequacy
        4.9 Shaft and Tunnel Lining, Roof Support and Rock Bolting
        4.10 Stairways
        4.11 Ladders
        4.12 Platforms, Runways and Ramps
        4.13 Lasers
        4.14 Tunnel and Raise Boring Machines
        4.15 Raising Boring
    5. Environmental Control
        5.1 Ventilation
        5.2 Oxygen
        5.3 Air Quality
        5.4 Testing Records
        5.5 Internal-Combustion Engines
    6. Related Facilities
        6.1 First Aid and Medical
        6.2 Drinking Water
        6.3 Toilets
        6.4 Change House
        6.5 Communication Systems
        6.6 Rescue Equipment and Personnel
    7. Fire Prevention
        7.1 General
        7.2 Combustible Structures
        7.3 Combustible Materials
        7.4 Storage and Handling of Flammable and Combustible Liquids
        7.5 Welding or Cutting
    8. Hoisting
        8.1 General
        8.2 Emergency Provisions
        8.3 Construction
        8.4 Operation
        8.5 Maintenance
    9. Haulage Systems
        9.1 Track
        9.2 Automatic Derailers
        9.3 Holding Devices on Inclines
        9.4 Locomotives and Similar Off-Track Equipment
        9.5 Transportation of Workers
        9.6 Automatic Coupling Devices
        9.7 Block Signals
        9.8 Safe Access
        9.9 Mobile Equipment
    10. Electrical
        10.1 General
        10.2 Illumination
        10.3 Conductors
        10.4 Grounding of Equipment
        10.5 Protection of Circuits
        10.6 Protection of Personnel
        10.7 Protection of Equipment
        10.8 Switchboards
        10.9 Transformers
        10.10 Switches and Circuit Breakers
        10.11 Battery Charging
        10.12 Lightning Arresters
    11. Drilling and Blasting
        11.1 Regulations
        11.2 Drilling Operations
    12. Compressed Air
        12.1 General
        12.2 Air Plant
        12.3 Locks
        12.4 Medical Care of Compressed-Air Workers
        12.5 Compressed-Air Operations
        12.6 Fire Prevention Under Compressed Air
    13. Training
        13.1 Designated Persons
        13.2 Lockout/Tagout
        13.3 Compressed Air
        13.4 Emergency Action
    Appendices
        Appendix A – Instruction for the Guidance of Compressed-Air Workers
        Appendix B – Survey of Job Site

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