Connection
6.1 Safety when connecting up
SCALANCE WxM766
Operating Instructions, 03/2022, C79000-G8976-C617-03
53
WARNING
Take measures to prevent transient overvoltages of more than 40% of the rated voltage
(or more than 119 V). This is guaranteed if you only operate the devices with SELV
(safety extra-low voltage) or PELV (protective extra low voltage).
WARNING
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 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:
WARNING
Do not remove or replace while circuit is live when a flammable or combustible
atmosphere is present.
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
WARNING - EXPLOSION HAZARD -
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE
NON-HAZARDOUS.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-
hazardous locations only.
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