Confined Space Classifications


NC1 Low Risk Confined Space Example

Low Risk Confined Space
A low risk confined space exists where there is easy entry/exit and natural ventilation.

NC1 Classification
Low risk shallow entry with adequate natural or mechanical ventilation, where access is simple and unobstructed and there is no likely risk of flooding. Eg: meter pits, valve chambers, booster-pumping stations, PRV chambers.

No breathing apparatus required for low risk

NC2 Medium Risk Confined Space Example

Medium Risk Confined Space
A medium risk confined space exists where there are access issues; a realistic expectation of encountering a specific risk; possible introduction of specified risks during the work activity.

NC2 Classification
Vertical direct unobstructed access with continuous attachment to a man riding hoist or similar mechanical rescue device.

Escape Set (Self Rescue) breathing apparatus required  to be taken into medium risk

NC3  Medium Risk Confined Space Example

Medium Risk Confined Space

NC3 Classification
When it is not possible to have persons permanently attached to a safety line. Usually it will be a team entry which moves away from the entry point. Eg: Man entry sewers, utility service subway tunnels, aqueducts and complex wet walls. Working without an attached rescue line and includes working away from the point of entry.

Escape Set (Self Rescue) breathing apparatus required to be taken into medium risk



High Risk Confined Space

A high risk confined space exists when there is a specified hazard that cannot be controlled or eliminated.

NC4 Classification
Non standard entries involving complex operations which introduce additional risks and require specific controls and rescue arrangements. Eg: mechanical hazards, physical complexity of system introduced hazards, enhanced specific intrinsic hazards.

Full breathing apparatus (working) required to be worn at all times in high risk


Low & Medium Risk

1 Day Course

Using Escape Sets

From – £130 + VAT


Low & Medium Risk
+ Top Person

1 Day Course

Using Escape Sets

From – £150 + VAT


High Risk

2 Day Course (experienced)

Using Full SCBA

ONLY – £400 + VAT


Manager / Supervisor + Entry (Low/Med) Risk

3 Day Course

ONLY – £650 + VAT



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