Power Supply - Viessmann VITOCAL 300-G Installation And Service Instructions Manual

Power supply

Danger
Incorrectly executed electrical
installations can lead to injury
from electrical current and result
in equipment damage.
Make the power supply connec-
tion and implement all earthing
measures (e.g. RCD circuit) in
accordance with the following
regulations:
■ IEC 60364-4-41
■ VDE requirements
■ Requirements specified by
your local power supply utility
■ Protect the power cable to the
control unit with no more than
16 A.
Danger
The absence of component
earthing in the system can lead to
serious injury from electrical cur-
rent if an electrical fault occurs.
The equipment and the pipework
must be connected to the earth
bonding of the house in ques-
tion.
Installation sequence
Isolators for non-earthed conductors
■ The main isolator (if installed) must
simultaneously isolate all non-earthed
conductors from the mains with a min-
imum contact separation of 3 mm.
■ If no main isolator is installed, all non-
earthed cables must be isolated from
the mains by the upstream breaker
with at least 3 mm contact separation.
Danger
Incorrect core termination can
cause severe injuries and dam-
age to the equipment.
Never interchange cores "L" and
"N".
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