Kemlux II Brochure - Hubbell Industrial Lighting

SPECIFYING HAZARDOUS LIGHTING
Many factors go into specifying hazardous
lighting. Care must be taken in determining
the classification of the hazardous location in
which the fixtures are being installed. Any
qualified inspector, underwriter or fire marshall
can help determine a Classification of an
area. The decisions which must be made are:
KS/KH VARIATIONS
CLASS (type of substance)
Class I Gas or Vapor
Class II Combustible Dust
Class III Ignitable Fibers and Flyings
GROUP (nature of substance)
CLASS I Group A Test Gas Acetylene
Group B Test Gas Hydrogen
Group C Test Gas Ethylene
Group D Test Gas Propane
The main factor in determining gas groups
is the maximum explosive pressure of the
gas. Group A is the gas group with most
explosive pressure. Group D is the least.
CLASS II Group E Metallic Dusts
Group F Carbonaceous Dusts
Group G Grain Dusts
The main factor in determining dust groups
is material resistance and dust particle size.
CLASS III No Groups
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DIVISION (occurrence of substance)
DIVISION 1 Hazardous area under normal
operating conditions.
(Example: manufacturing plant
using polypropylene to
manufacture end product.)
DIVISION 2 Hazardous area under
abnormal operating conditions.
(Example: storage tank farm.)
TEMPERATURE RATINGS (T-Ratings)
DEFINED
Maximum operating temperature of a fixture.
Class I and II, Division 1: T-Rating measured
externally.
Class I, Division 2: T-Rating measured
internally.
OBJECTIVE:
• Determine safe T-Rating requirement of
fixture for working environment.
• Specify fixture with equal or lower T-Rating
(per NEC ® Table 500-3[d]).
• The T-Rating determines the type (Division 1
or 2), wattage or light source of fixture to
be specified.
• See T-Ratings of Kemlux II on Page 6.
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TABLE NEC ® 500-3(d)
IDENTIFICATION
MAXIMUM TEMPERATURE
NUMBER C° F°
T1 450 842
T2 300 572
T2A 280 536
T2B 260 500
T2C 230 446
T2D 215 419
T3 200 392
T3A 180 356
T3B 165 329
T3C 160 320
T4 135 275
T4A 120 359
T5 100 212
T6 85 185
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REFRACTOR