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 |
Markings Required for IEC - Based Zone
Certifications
|
|
U.S. |
Canadian |
IEC |
European |
|
a) |
Class I |
Class I (optional) |
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|
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|
|
b) |
Zone 0, 1 or 2 |
Zone 0, 1 or 2 (optional) |
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|
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|
|
c) |
"AEx" symbol |
"Ex" symbol |
"Ex" symbol |
"EEx" symbol |
|
d) |
Protection Method symbol(s) |
Protection Method symbol(s) |
Protection Method symbol(s) |
Protection Method symbol(s) |
|
e) |
Gas Groups IIA, IIB or IIC |
Gas Groups IIA, IIB or IIC |
Gas Groups IIA, IIB or IIC |
Gas Groups IIA, IIB or IIC |
|
f) |
Temperature Codes T1 - T6 |
Temperature Codes T1 - T6 |
Temperature Codes T1 - T6 |
Temperature Codes T1 -
T6 |
- a) Indicates explosive gas atmospheres.
b) Indicates
likelihood that explosive gas atmosphere is present when the
equipment is operating.
c) Symbol for apparatus for use in
explosive atmospheres. Internationally (including Canada), the
symbol "Ex" is used. In the U.S. only, the 1999 NEC requires the
symbol "AEx" instead of "Ex". In Europe only, the symbol "EEx" is
used.
d) Indicates the method of protection used to
prevent ignition of the explosive gas atmospheres.
e)
Indicates the ignition - related properties of the explosive gas
atmospheres.
f) Indicates the maximum surface temperature
of the equipment under normal operating conditions.
-
Markings Required for Division-Based Zone
Certifications
|
|
U.S. |
Canada |
|
a) |
Class I |
Class I |
|
b) |
Zone 0, 1 or 2 |
Zone 0, 1 and 2 |
|
c) |
Gas Groups IIA, IIB, or IIC |
Gas Groups IIA, IIB, or IIC |
|
d) |
Temperature Codes T1-T6 |
Temperature Codes
T1-T6 |
a) Indicates explosive gas atmospheres.
b) Indicates
likelihood that explosive gas atmosphere is present when the
equipment is operating.
c) Indicates the ignition - related
properties of the explosive gas atmospheres.
d) Indicates
the maximum surface temperature of the equipment under normal
operating conditions.
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