Connection
6.1 Safety when connecting up
SCALANCE W778-1 / W738-1
Operating Instructions, 03/2022, C79000-G8976-C450-07
53
WARNING
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).
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.
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.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous
locations only.
