Siemens SCALANCE W788-1 Operating Instructions Manual page 30

Connecting up
6.1 Lightning protection, power supply and grounding
General notes on use according to ATEX and IECEx
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
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
EXPLOSION HAZARD
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE
NON-HAZARDOUS.
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-
hazardous locations only.
This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous locations
only.
30
WARNING
WARNING
SCALANCE W788-x / W748-1
Operating Instructions, 06/2016, A5E03678333-10