Shallow entry with adquate natural or mechanical ventilation, where access is simple and unobstructed and there is no likely risk of flooding. Good examples of this are meter pits, valve chambers and PRV chambers.
Vertical direct unobstructed access with continuous attachment to a man riding hoist or similar mechanical rescue device.
Non standard entries involving complex operations which can introduce additional risks and require specific control and rescue arrangements. These can come from mechanical hazards, physical complexity of system introduced hazards and enhanced specific intrinsic hazards.
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