| Title |
Protection
concept
code used in
certification |
Symbol |
Typical
zone(s) |
CENELEC
Standard
|
Basic
concept of production |
Increased Safety
Tyne ‘n’ (Non-sparking)
|
3
4
|
EEx e
EEx nA
|
1&2
2
|
EN 50019
EN 50021
|
No arcs, sparks or hot surfaces |
Flameproof
Tyne ‘n’ (Enclosed break)
Quartz/sand filled
|
1
4
7
|
EEx d
EEx nC
EEx q
|
1&2
2
1&2
|
EN 50018
EN 50021
EN 50017
|
Contain the explosion, quench flame |
Intrinsic safety
Tyne ‘n’ (Energy limitation)
|
2
2
4
|
EEx ia
EEx nL
|
0,1&2
1&2
2
|
EN 50020/39
EN 50021
|
Limit energy of sparks & surface temp |
Pressurised
Type ‘n’ (restricted breathing)
Type ‘n’ (Simple pressurised)
Encapsulation
Oil Immersion
|
1
4
4
5
7
|
EEx p
EEx nR
EEx nP
EEx m
EEx o
|
1&2
2
2
1&2
1&2
|
EN 50016
EN 50021
EN 50021
EN50028
EN50015
|
Keep the flammable gas out |
