Honeywell ST 3000 Installation Manual page 100

B.2 International Electrotechnical Commission (IEC)
Classification of Hazardous Locations,
IEC Methods of
Protection
Protection Concept
Flameproof
Intrinsic Safety
Pressurized
Encapsulation
Increased Safety
Powder Filled
Oil Immersion
Non-sparking
Enclosed Break
Limited Energy
Restricted Breathing
90
The following table summarizes available methods of protection for use
in given locations.
Designation
d
ia
ib
p
m
e
q
o
nA
nC
nA
nR
ST 3000 Release 300 Installation Guide
Permitted Use
Zone 1 & 2 Contains explosion and
quenches flame.
Zone 0, 1 & 2 Limits energy of sparks under
2 faults.
Zone 1 & 2 Limits energy of sparks under
1 fault
Zone 1 Keeps flammable gases out.
Zone 1 & 2 Keeps flammable gases out.
Zone 1 & 2 No arcs, sparks or hot
surface.
Zone 1 & 2 Contains explosion and
quenches flame.
Zone 1 & 2 Keeps flammable gases out.
Zone 2 No arcs, sparks or hot
surfaces under normal
conditions.
Zone 2 Contains explosion and
quenches flame.
Zone 2 Limits energy of sparks and
surface temperature under
normal conditions.
Zone 2 Keeps flammable gases out.
Continued
Principle
Continued on next page
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