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Table 10: FIRE EXTINGUISHERS FOR DIFFERENT TYPES OF CLASS B HAZARDS
TYPE OF
HAZARD MIN.
EXTINGUISHER
RATING
Low
Moderate
High 5-B
10-B
40-B
MAX. TRAVEL
DISTANCE TO
EXTINGUISHER
(m)
10
10
10
MAX. AREA
(OPEN AREA) PER
EXTINGUISHER
(m 2 )
200
100
75
ii. The protection requirements shall be permitted to be fulfilled
with fire extinguishers of higher rating, provided the travel
distance to such larger fire extinguishers does not exceed
fifteen meters (15 m).
iii. In cases where building spaces are compartmentalized or
separated from each other by fire barriers, each compartment
not exceeding the maximum protection area specified Table 10
shall be provided with at least 1 fire extinguisher.
c. Class B Hazards in Flammable Liquids of Appreciable Depth
(greater than 0.6 cm).
i. Portable fire extinguishers shall not be installed as the sole
protection for flammable liquid hazards of appreciable depth
where the surface area exceeds one square meters (1.0 m2 ).
ii. For flammable liquid hazards of appreciable depth, a Class B
fire extinguisher shall be provided on the basis of at least two
numerical units of Class B extinguishing potential per square
meters of flammable liquid surface of the largest hazard area.
iii. Travel distances for portable fire extinguishers shall not exceed
ten meters (10 m).
d. Class C Hazards
Fire extinguishers with Class C ratings shall be required where
energized electrical equipment can be encountered that would
require a nonconducting extinguishing medium. This requirement
includes situations where fire either directly involves or surrounds
electrical equipment. Since the fire itself is a Class A or Class B
hazard, the fire extinguishers shall be sized and located on the basis
of the anticipated Class A or class B hazard.
e. Class D Hazards
i.
Fire extinguishers or extinguishing agents with Class D ratings
shall be provided for fires involving combustible metals.
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