BS5839 -1 2017 states all fire alarm systems must have a Zone diagram correctly orientated mounted next to the fire alarm panel and repeater. The Zone plan must be a diagrammatic representation of your building, showing specific topographic information and the division of the building into detection zones to allow Users and Fire Fighters to access the source of the fire quickly.
Failure to comply would be considered a MAJOR NON-CONFORMITY .
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As can be seen the diagram is colored and provides information on locating the source of Fire!