Connecting Cores In The Power Supply Unit - Viessmann WAGO KNX/TP gateway Installation And Service Instructions For Contractors

Power supply
(cont.)
The connection version must be selected subject to
the heating system and the required monitoring func-
tion. The recommended connection version is the
"power supply via the mains isolator".
Regulations
Connect the power supply and implement all safety
measures (e.g. RCD circuit) in accordance with
IEC 364, the connection requirements of your local
power supply utility, and VDE or national regulations.
Protect the power cable to the gateway power supply
unit with a maximum fuse rating of 16 A across all
poles.

Connecting cores in the power supply unit

2.
Fig. 14
3.
1.
Isolators for non-earthed conductors
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage cate-
gory III (3 mm) for complete isolation. This isolator
must be fitted in the permanent electrical installation
in line with installation requirements, e.g. mains iso-
lator or upstream circuit breaker.
■ We additionally recommend installing an AC/DC-
sensitive RCD (RCD class B
currents that can occur with energy efficient equip-
ment.
Installation sequence
) for DC (fault)
19