NAMOS Site Markings

The chief aim of NAMOS Regulations is to warn firefighters that hazardous substances are present at a site in the event of an emergency.

Access marking

Any sites having present a quantity of 25 tonnes or more of dangerous substances at any one time must display signs bearing the exclamation mark symbol, as defined by BS 5378 (as superseded by BS 5499 Part 5 2002). These must be displayed where they will give adequate warning to firefighters before they enter the site in an emergency.

Location marking

Location safety signs must be displayed as directed by a member of our staff.

The officer must be satisfied that only those signs necessary to warn firefighters in an emergency that dangerous substances are present are asked for, and displayed accordingly. The intention of these signs is to give firefighters information of significant hazards within a site.

When necessary, and where there is only one dangerous substance or there are two or more dangerous substances with the same classification at any one location, a single sign bearing the correct classification symbol will be displayed together with the hazard warning text.

Where there are two or more dangerous substances with different classifications at any one location, a single sign bearing the exclamation mark symbol will be displayed together with the hazard warning text 'Dangerous Substance'.

All location signs must be displayed in places that will give adequate warning to Firefighters before entering any danger area in an emergency.

Maintenance of signs

The person in control of the site shall, so far as is reasonably practicable, ensure that any safety signs displayed at the site are kept clean and free from obstruction.

Click here to view site marking signs.