Siemens S7-300 Installation And Operating Manual page 60

General technical data
7.2 Standards and Approvals
FM approval
Factory Mutual Research (FM) to
Approval Standard Class Number 3611, 3600, 3810
APPROVED for use in Class I, Division 2, Group A, B, C, D Tx; Class I, Zone 2, Group IIC
Tx
There is a risk of personal injury or material damage.
In hazardous areas, personal injury or material damage can occur if you disconnect plug-in
connections during operation.
Always shut down power to the distributed I/O before you unplug any plug-in connections in
hazardous areas.
to EN 60079-15:2005 (Electrical apparatus for explosive gas atmospheres; Type of
protection "n")
to EN 60079-0:2006 (Electrical apparatus for explosive gas atmospheres; general
requirements)
For SM 326; DI 8 x NAMUR:
94/9/EC "Equipment and protective systems for use in potentially explosive atmospheres"
(Explosion Protection Directive):
This approval applies to explosive gas mixtures of Group IIC (see the
ET 200M Automation Systems, Principles of Intrinsically-Safe Design
related limits are defined in the Certificate of Conformity (see the annex).
Note
Modules with II (2) G [Ex ib] IIC approval are considered associated equipment and must be
installed outside the potentially explosive environment. Intrinsically-safe electrical equipment
for Zones 1 and 2 may be connected.
60
WARNING
II 3 G Ex nA II T3..T6 (exceptSM 326; DI 8 x NAMUR)
II 3 (2) G Ex nA [ib] IIC T4(only SM 326; DI 8 x NAMUR)
II (2) G [Ex ib] IIC
Installation and Operating Manual, 01/2010, A5E00085586-10
S7-300, M7-300,
manual). Safety-
Fail-safe signal modules