Methods of protection, Temperature category, C ambient unless otherwise stated – Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual User Manual
Page 10
Publication 1797-6.5.6 - June 2005
Preface 6
Methods of Protection
The following techniques are rated by methods of protection.
Temperature Category
The temperature category defines the maximum surface temperature of the
device. Ratings are given with reference to 40
o
C ambient unless otherwise
stated.
Technique
Symbol for Protection Method
Permitted Zone
Permitted Division
Zone
Division
IEC
CENELEC
NEC
CEC
Oil Immersion
Ex o
EEx o
AEx o
Ex o
1 and 2
*
Pressurization
Ex p
EEx p
AEx p
Ex p
Type X, Y, Z
1 and 2
1 (X, Y) and 2 (Z)
Powder Filling
Ex q
EEx q
AEx q
Ex q
1 and 2
*
Flameproof
Ex d
EEx d
AEx d
Ex d
1 and 2
Explosionproof
XP
1 and 2
Increased Safety
Ex e
EEx e
AEx e
Ex e
1 and 2
*
Intrinsic Safety
Dual Fault
Single Fault
Ex ia
Ex ib
EEx ia
EEx ib
AEx ia
AEx ib
Ex ia
Ex ib
IS
0, 1, and 2
1 and 2
1 and 2
Non-Incendive
Limited Energy
Non-Sparking
Enclosed Break
Restricted Breathing
Simplified Pressurization
Ex nL
Ex nV
Ex nW
Ex nR
Ex nP
EEx nL
EEx nV
EEx nW
EEx nR
EEx nP
AEx nL
AEx nV
AEx nW
AEx nR
AEx nP
Ex nL
Ex nV
Ex nW
Ex nR
Ex nP
NI
2
2
Encapsulation
Ex m
EEx m
Aex m
Ex m
1 and 2
*
*
These protection methods are not recognized in the Division method. However, they may be suitable for some North American Division applications.
T1
450
o
C (842
o
F)
T3A
180
o
C (356
o
F)
T2
300
o
C (572
o
F)
T3B
165
o
C (329
o
F)
T2A
280
o
C (536
o
F)
T3C
160
o
C (320
o
F)
T2B
260
o
C (500
o
F)
T4
135
o
C (275
o
F)
T2C
230
o
C (446
o
F)
T4A
120
o
C (248
o
F)
T2D
215
o
C (419
o
F)
T5
100
o
C (212
o
F)
T3
200
o
C (392
o
F)
T6
85
o
C (185
o
F)
The additional temperature categories highlighted above are for North America only.