Siemens EK 720 Series Instructions d'exploitation télécharger pdf (Page 18)

Connection

5.1 Lightning protection, power supply and grounding

SCALANCE W760/W720

18 Operating Instructions, 03/2015, C79000-G8976-C322-04

Supply voltage

WARNING

Safety extra low voltage

The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a

Limited Power Source (LPS).

This means that only SELV / LPS (Limited Power Source) complying with IEC 60950-1 / EN

60950-1 / VDE 0805-1 must be connected to the power supply terminals or the power

supply unit for the equipment power supply must comply with NEC Class 2, as described b

the National Electrical Code (r) (ANSI / NFPA 70).

If the equipment is connected to a redundant power supply (two separate power supplies),

both must meet these requirements.

WARNING

Transient overvoltages

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).

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Siemens EK 720 Series Instructions d'exploitation Page 18