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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:
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.
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).
General notes on use in hazardous areas according to UL-HazLoc
If you use the device under UL-HazLoc conditions, you must also adhere to the following
safety notices in addition to the general safety notices for protection against explosion:
WARNING - EXPLOSION HAZARD -
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE
NON-HAZARDOUS.
SCALANCE W788-x / W748-1
Operating Instructions, 03/2022, A5E03678333-17
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
51
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