Siemens SCALANCE XB-000 Operating Instructions Manual page 47

Insufficient isolation of intrinsically safe and non-intrinsically safe circuits
Risk of explosion in hazardous areas
• When connecting intrinsically safe and non-intrinsically safe circuits, ensure that the
• Observe the device approvals applicable for your country.
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
At an ambient temperature of ≥ 60 °C, use heat-resistant cables designed for an ambient
temperature at least 20 °C higher. 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 instructions for use in hazardous locations according to UL/FM HazLoc
If you use the device under UL or FM HazLoc conditions, you must also adhere to the following
safety instructions in addition to the general safety instructions 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 the device according to ATEX/IECEx and FM
If you use the device under ATEX/IECEx or FM conditions, you must also observe the following
safety notices in addition to the general safety notices for protection against explosion:
SCALANCE XB-000
Operating Instructions, 01/2022, A2B00077300-11
WARNING
galvanic isolation is performed properly in compliance with local regulations (e.g. IEC
60079-14).
WARNING
WARNING
WARNING
Connecting up
6.1 Safety when connecting up
47