Siemens SIMATIC NET SCALANCE XR-300WG Operating Instructions Manual page 37

Do not remove or replace while circuit is live when a flammable or combustible atmosphere is
present.
Explosion hazard
Do not disconnect equipment when a flammable or combustible atmosphere is present.
EXPLOSION HAZARD
For operation the device is intended to be installed within an enclosure/control cabinet. The
inner temperature of the enclosure/control cabinet corresponds to the ambient temperature of
the device. Use installation wiring connections with admitted maximum operating
temperature of at least 30 °C higher than maximum ambient temperature.
Safety notices when using the device as industrial control equipment according to UL
61010-2-201
If you use the device under UL 61010-2-201 conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
Open equipment
The devices are "open equipment" according to the standard IEC 61010-2-201 or UL
61010-2-201 / CSA C22.2 No. 61010-2-201. To fulfill requirements for safe operation with
regard to mechanical stability, flame retardation, stability, and protection against contact, the
following alternative types of installation are specified:
• Installation in a suitable cabinet.
• Installation in a suitable enclosure.
• Installation in a suitably equipped, enclosed control room.
If the cable or housing socket exceeds 70 °C or the branching point of the cables exceeds 60 °C,
special precautions must be taken. If the equipment is operated in an air ambient in excess of
40 °C, only use cables with admitted maximum operating temperature of at least 80 ℃.
SCALANCE XR-300WG
Operating Instructions, 03/2021, C79000-G8976-C454-07
WARNING
WARNING
WARNING
WARNING
WARNING
Installation
5.1 Safety notices for installation
37