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Fire Extinguishers Rating
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Extinguisher Rating Numerical rating given to Class A and B
extinguishers which indicate how large a
fire an experienced person can put out with
the extinguisher
Ratings are based on tests conducted at
Underwriters Laboratories, Inc.
Class A: 1-A, 2-A, . . . 40-A
Class B: 1-B, 2-B, . . . 640-B
A 4-A extinguisher, for example, should
extinguish about twice as much fire as a 2-A
extinguisher
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Fire Extinguishers Rating
Unlike some products, extinguishers have tobe installed in public premises, and a
standard form of assessment is required todetermine how many extinguishers andwhat type are needed to protect a given risk.
There are two main rating systems:
CEN (European System)
U.L. (American System)
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CEN European System
Class A Fire Extinguishers
Crib of wooden sticks. All cribs are 0.56 meters high and 0.5 meters wide, but the length
varies for specific ratings. For example the length is 0.3 m for 3A
& 5.5 m for 55 A.
A tray containing Heptane is placed under the crib to light thefire.(The test fires are located indoors.)
After 2 minutes the try is removed, Fire allowed to burn for 6
minutes.
For the test to be successful it is essential that all flames should beextinguished and there should be no recurrence of flaming during
the three minutes following the complete discharge of the
extinguisher.
2 tests out of 3 succeeded
Ext. passed the test
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Class A Fire Tests
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Class A test fireSide view
showing 13A fire
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Class A Test Fire
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Length of Wooden Curbs
Rate Length of Wooden Curbs3A 0.3 meter
5A 0.5 meter
8A 0.8 meter13A 1.3 meter
21A 2.1 meter
27A 2.7 meter
34A 3.4 meter
43A 4.3 meter
55A 5.5 meter
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Class BFlammable Liquids
Tests are conducted in a range of welded sheetcircular cylindrical trays.
Each tray in the series is designated by a numberrepresenting the amount of fuel required in liters as inthe table.
The fuel is Heptane.
The fire is allowed for 1 minute pre-burn. The wind speed should not be greater than 3m/sec.
And ambient temp. between 0 30 degree C.
2 tests out of 3Ext. succeeded.
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Class B Tests
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Rating Volume of Fuel in Liter
8B
13B
8 liters
13 liters
21B
34B
21 liters
34 Liters
55B
70B
55 liters
70 Liters
89B
113B
89 liters
113 Liters
144B
183B
233B
144 liters
183Liters
233 Liters
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U.L. Rating System
Class A Fire Test WoodCrib Fire Test:
Tests up to 10A in draft free room.
For rating class exceeding 10A the test may
be conducted outdoors .
A test fire shall be considered to be
extinguishedno self re-ignition.
2 tests out of 3ext. succeeded.
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Class A Fire Test
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Dimension of Wooden Curbs
Rate # of
Sticks
Dimension
In millimeter
# of
Layer
s
# of
Sticks in
each
layer
1A 50 45X45X500 10 5
3A 98 45X45X600 14 7
6A 153 45X45X1000 17 9
10A 209 45X45X1220 19 11
20A 150 45X65X1500 10 15
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Class B Fire Test
Flammable liquid fire tests are to be
conducted in a large volume draft-free room
for a rating 20B. For more than 20B rating is conducted
outdoor.
Tests to be conducted in square shape trays.
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Class B Fire Test
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Class B Fire Test
Rating Volume of Fuel
1B 12 LITER
10B 120 LITER
20B 250 LITER
30B 350 LITER
40B 475 LITER60B 720 LITER
80B 950 LITER
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Outdoor Tests
120-B 375 gallons
160-B 500 gallons
240-B 750 gallons
320-B 1000 gallons
480-B 1500 gallons
640-B 2000 gallons