User Manual

35
Siemens Switzerland Ltd
Building Technologies Division
Notes:
1. In the European norms electrical fires are not considered to constitute a fire class on their own, as
electricity is a source of ignition that will feed the fire until removed.
2. The above table reflects the European classification system. Definitions used by regulatory bodies in
other parts of the world may show some minor differences.
For example in the USA: Cooking materials  Class K
Liquids + Gases  Class B
Electrical equipment  Class C
Extinguisher
types
Class of Fire
A
B C D F
Solids Liquids Gases Metal Cooking
oils
Water Yes No No No No
Foam Yes Yes No No No
ABC Powder Yes Yes Yes No No
Dry powder
(Metal Fires)
No No No Yes No
CO No 2 Yes No No No
Wet chemical No No No No Yes
Figure 4.3.3-2 Fire extinguisher applications
4.3.4. Wall hydrants
Wall hydrants are used to complement fire extinguishers in dealing with incipient stage fires. They are intended
both for trained staff and fire service use. Wall hydrants are evenly distributed throughout the building, providing
water outlets from the building’s extinguishing water pipe network. Care must be taken to prevent contamination
of the drinking water supply by the water used for extinguishing. For this reason the extinguishing water is
generally taken from a separate water supply tank and fed under pressure into the pipe network via fire pumps.
4.4. Extinguishing in hotels
A hotel is a complex building with diverse demands on the extinguishing infrastructure to be provided.
What is installed will be largely determined by:
• Local building codes
• Insurance guidelines
• Official fire safety reports
• Size of the property