Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 53

Electrical connections
Other electrical connections
Make other electrical connections according to the
"System examples" document and the connection and
wiring diagram. See page 184.
Power supply
Power supply to "KSK 2.03 PCB". See "Connection
fÖ
and wiring diagram", page 189.
Connect the power supply and implement all safety
measures (e.g. RCD circuit) in accordance with
IEC 60364-4-41, the connection requirements of your
local grid operator and VDE or national regulations.
Protect the power cable to the control unit with a fuse
with a max. rating of C 13 A.
Isolator
Install an isolator in the power cable to provide omnip-
olar separation from the mains for all active conduc-
tors, corresponding to overvoltage category III (3 mm)
for full isolation. The isolator must be fitted in the per-
manent electrical installation, in line with installation
requirements.
Recommended power cable
3-core cable selected from the following options:
■
H05VV-F3G 1.5 mm 2
■ H05RN-F3G 1.5 mm 2
1. Check that the power cable to the control unit is fit-
ted with a fuse with a max. rating of C 13 A.
2. Connect the power cable in the junction box and
the control unit (on site).
Danger
Incorrect core assignment can result in seri-
ous injury and damage to the appliance.
Take care not to interchange wires "L1" and
"N".
(cont.)
Note
Make earth cable "PE" longer than the other connect-
ing cables to ensure it will not be pulled off under ten-
sion.
Colour coding to IEC 60757:
BN Brown
BU Blue
GNYE Green/yellow
Installation sequence
53