B.1 North American Classification of Hazardous
Locations,
Continued
Methods of Protection
The following table summarizes available methods of protection for use
in given locations.
Protection Concept Designation Permitted Use Principle
Explosionproof XP Division 1 & 2 Contains explosion and
quenches flame.
Intrinsic Safety IS Division 1 & 2 Limit energy of sparks under
normal and fault conditions.
Pressurized Type X and Y Division 1 Keeps flammable gas out.
Pressurized Type Z Division 2 Keeps flammable gas out.
Nonincendive NI Division 2 No arcs, sparks or hot surfaces
under normal conditions
Temperature
Classification
Equipment intended for installation directly within the hazardous
location classification must also be classified for the maximum surface
temperature that can be generated under normal or fault conditions as
referenced to either 40°C (104°F) or the maximum operating ambient of
the equipment (whichever is greater). The maximum surface
temperature must be less than the minimum autoignition temperature of
the hazardous atmosphere present. The temperature shall be indicated in
identification numbers as listed in the following table.
Maximum Temperature
Degrees C Degrees F
Identification Number
450 842
T1
300 572
T2
280 536
T2A
260 500
T2B
230 446
T2C
215 419
T2D
200 392
T3
180 356
T3A
165 329
T3B
160 320
T3C
135 275
T4
120 248
T4A
100 212
T5
85 185
T6
Continued on next page
2/05 ST 3000 Release 300 Installation Guide
85
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