Following implementation of the control measures, the next priority is the identification and implementation of mitigation measures to reduce the detrimental effects of a fire, explosion or similar incident.

1.2 Mitigation measures:
These are as follows:

• Reducing the number of employees exposed to the risk.
• Providing plant that is explosion resistant.
• Providing explosion suppression or explosion relief equipment.
• Taking measures to control or minimise the spread of fires or explosions.
• Providing suitable personal protective equipment (PPE).

The provision of suitable PPE should not be a substitute for providing appropriate protective measures on the plant, equipment or workplace itself.

1.3 Additional requirements where explosive atmospheres can occur:
The correct implementation of control measures aims to prevent the formation of potentially explosive atmospheres, or limit their extent. However, due to the way dangerous substances are stored, handled and used, it is not possible to fully avoid the risk of potentially explosive atmospheres occurring.

In areas where hazardous explosive atmospheres may occur, employers must ensure that:

• All potential ignition sources, including sparks, hot surfaces, smoking materials, naked flames, unsuitable equipment etc are excluded.
• Only equipment and protective systems, including portable equipment that meets the requirements of the equipment and protective systems intended for use in potentially explosive atmospheres should be used and installed.
• Before bringing them into operation for the first time, as part of the commissioning procedure, a person competent to do so should verify that the equipment and protective systems provided are suitable and sufficient to make sure the fire and explosion risks are properly controlled.
• People who provide, maintain or verify electrical installations and equipment in, or associated with, the hazardous areas are competent to undertake the task.
• Where necessary, a warning sign is posted at the entry points of places that have been classified as hazardous areas to warn those entering those areas that special precautions are required.
• Employees working in hazardous areas are provided with appropriate clothing that does not create a risk of an electrostatic discharge capable of igniting the explosive atmosphere.