When a work process risk assessment identifies that the work is likely to affect the fire alarm system or will require a change to the building fire precautions, temporary isolation and impairment of fire protection system will need to be adopted to reduce risks to occupants and building.As fire system isolations and impairments affect the ability to detect and respond to fires, it is essential that appropriate measures of fire protection should be in place to mitigate risks associated with the isolation and impairment. The purpose of this document is to ensure: