APPENDIX
WATER UK NATIONAL CLASSIFICATIONS (NC) OF ENTRIES
NC1 (Low Risk) Shallow entries with adequate ventilation, natural or mechanical, where access is simple and unobstructed and there is no likely risk of flooding.
EXAMPLE
- Meter Pits
- Valve Chambers
- Booster Pump Stations
- Pressure Release Valve Chambers
NC2 (Medium Risk) Vertical direct unobstructed access with continous attachment to a man riding hoist or similar rescue device.
EXAMPLE
- Meter Pits
- Valve Chambers
- Booster Pump Stations
- Pressure Release Valve Chambers
NC3 (Medium Risk) When it is not possible to have a person permanently attached to safe line/rescue line. Usually it will be a team entry which moves away from the entry point.
EXAMPLE
- Man entry sewers
- Utility service subway tunnels
- Aqueducts
- Complex wet wells
NC4 (High Risk) Nonstandard entries involving complex operations which introduce additional risks and
require specific controls and rescue arrangements.
EXAMPLE
- Mechanical hazards
- Physical complexity of system introduced hazards
- Enhanced specific intrinsic hazards
Although every effort has been taken to ensure that the information contained within this manual is correct at time of writing, no responsibility can be accepted by AIS Training for errors or omissions contained within.
This manual does not seek to replace or override legislation, company policies or site regulations, and the reader should refer directly to those documents should they exist. Should a conflict arise, you must act within both the law and the regulations imposed by your employer or the site owner. Where compliance to the Confined Space Regulations and or the Work at Height Regulations is a concern you should discuss the issues with your Health and Safety manager before starting work.