WAGO 750-830 Manual page 321

9.3.5 Types of Ignition Protection
Ignition protection defines the special measures to be taken for electrical
components in order to prevent the ignition of surrounding explosive
atmospheres. For this reason a differentiation is made between the following
types of ignition protection:
Tab. 9-5: Types of Ignition Protection
Identifi-
cation
Ex o
Ex p
Ex q
Ex d
Ex e
Ex m
Ex i
Ex n
Ignition protection "n" describes exclusively the use of explosion protected
electrical components in zone 2. This zone encompasses areas where
explosive atmospheres can only be expected to occur rarely or short-term. It
represents the transition between the area of zone 1, which requires an
explosion protection and safe area in which for instance welding is allowed at
any time.
Regulations covering these electrical components are being prepared on a
world-wide scale. Organizations such as the PTB in Germany certify that the
devices meet the requirements of the European standard EN 60079-15.
Type "n" ignition protection additionally requires electrical components to be
marked with the following extended identification:
• Non-sparking apparatus "nA"
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
CENELEC standard
EN 60079-6
EN 60079-2
EN 60079-5
EN 60079-1
EN 60079-7
EN 60079-18
EN 60079-11 (Device)
EN 60079-25 (System)
EN 60079-15
Apparatus, which is designed so that the risk of occurrence of arcs or
sparks, which can give rise to an ignition hazard during normal operation,
is minimized.
Use in Hazardous Environments
Classification Meeting CENELEC and IEC
IEC standard Explanation
Oil encapsulation
IEC 60079-6
Overpressure
IEC 60079-2
encapsulation
Sand encapsulation
IEC 60079-5
Pressure resistant
IEC 60079-1
encapsulation
Increased safety
IEC 60079-7
Cast encapsulation
IEC 60079-18
Intrinsic safety
IEC 60079-11
Electrical
IEC 60079-15
components for
zone 2 (see below)
• 321
Application
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 0 + 1 + 2
Zone 2