Siemens SIMATIC ET 200iSP Operating Instructions Manual page 22

Product overview
1.3 ET 200iSP in the Hazardous Area
Types of protection of the ET 200iSP
The types of protection include design and electrical measures relating to the equipment to
achieve explosion protection in the hazardous areas.
Table 1-4 Types of protection
Type of Protection
Intrinsic safety i
Explosion-proof enclo‐
sure d
Increased-safety enclo‐
sure e
Encapsulation "m"
22
Meaning
All voltages, currents, inductance and
capacitance occurring are limited by
electrical measures (intrinsically safe) -
sparks or thermal effects capable of
causing ignition cannot occur.
The power supply module is installed in
a stable (explosion-proof) enclosure. If
the explosive atmosphere within the en‐
closure ignites, the enclosure will with‐
stand the explosion and contain the ex‐
plosion within the module.
In the Zone 1 hazardous area, the ET
200iSP must be installed in an additional
enclosure. The enclosure must have the
increased safety e type of protection.
This type of protection involves addition‐
al measures to avoid the occurrence of
high temperatures, sparks and arc-
over.
In the Zone 2 hazardous area, this type
of protection is unnecessary. Here, the
ET 200iSP must simply be installed in an
enclosure suitable for zone 2 with at
least degree of protection IP 54.
In electronic module 2 DO Relay UC60V/
2A, the internal relay is embedded in a
sealing compound. This means that an
explosive atmosphere surrounding the
equipment can be ignited neither by
sparks nor by unacceptable heating.
Representation
Operating Instructions, 11/2017, A5E00247483-07
ET 200iSP