|
Protection
Concepts |
Symbol
|
Zone |
Standard |
How
it works |
Category |
|
Increased
Safety |
Ex
e
|
1
& 2 |
EN 50019 |
No
arcs, sparks or hot surfaces |
2 |
|
Non-sparking |
Ex
nA |
2 |
EN 50021 |
3 |
|
Flameproof |
Ex
d
|
1
& 2 |
EN 50018 |
Contain
the explosion and quench flame |
2 |
|
Enclosed
Break |
Ex
nW
|
2 |
EN 50021 |
3 |
|
Quartz/Sand
Filled |
Ex
q |
1
& 2 |
EN 50017 |
2 |
|
Intrinsic
Safety |
Ex
ia
Ex
ib |
0,1
& 2
1 & 2 |
EN 50020
EN 50039 |
Limit
energy of sparks; limit the temperature |
1
2
3
|
|
Energy
Limitation |
Ex
nL |
2 |
EN 50021 |
|
Pressurised |
Ex
p |
1
& 2 |
EN 50016 |
Keep the flammable
gas away from any hot surfaces and ignition Capable
equipment
|
2
|
|
Simplified
Pressurisation |
Ex
nP |
2 |
EN 50021 |
3 |
|
Encapsulation
|
Ex
m |
1
& 2 |
EN 50028 |
2 |
|
Oil
Immersion |
Ex
o
|
1
& 2 |
EN 50015 |
2 |
|
Restricted
breathing
|
Ex
nR |
2 |
EN 50021 |
3 |
|
Special |
Ex
s |
0*,1&2 |
EHSR (ATEX) |
Any Proven Method |
1,2&3 |
|
|
* Label must indicate Zone 0 |
|
|
Classification |
Criteria For Zone |
ATEX Marking |
|
Zone
0 |
Flammable
material always present or for long periods (e.g.1000 hours or more
per year) |
G |
Category
1 Equipment |
|
Zone
20 |
D |
|
Zone
1 |
Flammable
material present in normal operation (e.g. 10-1000 hours/year) |
G |
Category
2 Equipment |
|
Zone
21 |
D |
|
Zone
2 |
Flammable
material present for short periods only (e.g. less than 10 hours/year) |
G |
Category
3 Equipment |
|
Zone
22 |
D |
