Siemens SCALANCE X-200 Operating Instructions Manual page 43

Further notes
If the cable or conduit entry point exceeds 70 °C or the branching point of conductors
exceeds 80 °C, special precautions must be taken. If the equipment is operated in an air
ambient in excess of 50 °C, only use cables with admitted maximum operating temperature
of at least 80 °C.
Electric shock - turn off the power supply
Turn off the power supply before you connect or disconnect cables from the device.
NOTICE
Overvoltage protection
If IE Switches X-200 are supplied over long 24 V power supply lines or networks, measures
are necessary to prevent interference by strong electromagnetic pulses on the supply lines.
These can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of devices of the IE Switches X-200 to
electromagnetic interference was the "surge immunity test" according to EN61000-4-5. This
test requires overvoltage protection for the power supply lines. A suitable device is, for
example, the Dehn Blitzductor BVT AVD 24 V type no. 918 422 or a comparable protective
element.
Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans-Dehn-Str.1, Postfach 1640, D-92306
Neumarkt, Germany.
SCALANCE X-200
Operating Instructions, 03/2015, C79000-G8976-C284-06
WARNING
CAUTION
Connecting up
5.1 Safety when connecting up
43