Connection
6.2 Power supply
SCALANCE W774-1 / W734-1
50 Operating Instructions, 03/2022, C79000-G8976-C325-15
6.2 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
SCALANCE W774/W734 RJ45
With this device version, there are two options for the power supply:
• Direct infeed via the four-pin connection socket ①
For the direct infeed of the power supply, use copper cables with the following
properties:
– Round cable cross-section with 6 to 8 mm diameter.
– Two-wire cable with 0.5 to 1.5 mm2 cross-section per wire.
– Permitted tensile load at least 100 N. - UL
– Listing of the cables according to the national installation regulations. In areas
where NEC or CEC applies: Type PTLC or ITC
• Power over Ethernet via the RJ45 Ethernet interface P2 ②. The other Ethernet
interface P1 is not capable of PoE.
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