Siemens SIMATIC NET SCALANCE XC-300 Operating Instructions Manual page 57

Notes for use in hazardous locations according to ATEX, IECEx, UKEX and CCC Ex
If you use the device under ATEX, IECEx, UKEX or CCC Ex conditions you must also keep to the
following safety instructions in addition to the general safety instructions for protection against
explosion:
Transient overvoltages
Take measures to prevent transient overvoltages of more than 40% of the rated voltage (or
more than 119 V). This is the case if you only operate devices with SELV (safety extra-low
voltage).
Suitable cables at high ambient temperatures in hazardous area
If the device is operated at max. ambient temperature, you must use cables with a permitted
maximum operating temperature of at least 90 ℃ for power supply, functional grounding and
signaling contact and of at least 75 °C for data cables. The cable entries used on the enclosure
must comply with the IP degree of protection required by EN IEC / IEC 60079-0, GB 3836.1.
Safety notices when using the device according to Hazardous Locations (HazLoc)
If you use the device under HazLoc conditions you must also keep to the following safety notices
in addition to the general safety notices for protection against explosion:
EXPLOSION HAZARD
You may only connect or disconnect cables carrying electricity when the power supply is
switched off or when the device is in an area without inflammable gas concentrations.
Safety notices when using according to FM
If you use the device under FM conditions you must also keep to the following safety notices in
addition to the general safety notices for protection against explosion:
EXPLOSION HAZARD
Do not disconnect while circuit is live unless area is known to be non-hazardous.
SCALANCE XC-300
Operating Instructions, 10/2022, C79000-G8976-C584-01
WARNING
WARNING
WARNING
WARNING
Connecting up
6.1 Safety when connecting up
57