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Developed and maintained by the NFCC

Control measure

Safe system of work: Reduced visibility


Knowledge and understanding

Control measure element Learning outcome

Safe working in reduced visibility  


  • The methods available to improve visibility at an incident  
  • The hazards associated with using some lighting in enclosed spaces and flammable atmospheres

Practical application

Control measure element Learning outcome

Review the tactical plan as visibility changes

Demonstrate the ability to:   

  • Ensure the tactical plan takes into account changes in visibility

Request sufficient lighting of an appropriate type for working in reduced visibility

Demonstrate the ability to:

  • Request the appropriate type and quantity of lighting to illuminate:
    • The scene
    • The hazard
    • Personnel
  • Consider if the lighting needs to be suitable for use in explosive atmospheres

Review the area before visibility reduces

Demonstrate the ability to:

  • Inspect the scene of operations if visibility may reduce during the incident

Consider using physical barriers to define routes and indicate the presence of hazards in reduced visibility

Demonstrate the ability to:

  • Establish physical barriers if appropriate to indicate:
    • Routes
    • Presence of hazards

Deploy additional safety officers to take into account the reduced visibility

Demonstrate the ability to:

  • Appoint additional safety officers if appropriate

Provide lighting to illuminate routes and hazards in reduced visibility

Demonstrate the ability to:

  • Use appropriate equipment to Illuminate routes and hazards
  • Consider the effects of using lighting equipment to ensure safe systems of work are maintained when working in reduced visibility

Ensure generators being used to provide lighting are located in an appropriate position to reduce the impact of noise and fumes

Demonstrate the ability to:

  • Consider the potential for generators producing noise and toxic fumes
  • Use alternative forms of lighting if noise or toxic fumes could impact on the incident