Power Supply - Siemens SIMATIC NET SCALANCE W774-1 Operating Instructions Manual

Connection

5.2 Power supply

General notes on use according to ATEX and IECEx
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
General notes on use in hazardous areas according to UL-HazLoc
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.
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.
5.2 Power supply
Note
Galvanic isolation of the power supply unit
To ensure dielectric strength according to IEEE 802.3, the supplying 24 V power supply
unit must be galvanically isolated with a dielectric strength of 1500 VAC. The galvanic
isolation must also not be bridged by other devices connected to the same power supply
unit.
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WARNING
WARNING
Operating Instructions, 07/2020, C79000-G8976-C325-14
SCALANCE W774-1 /W734-1