Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 39

Electrical connection
■ Route LV leads < 42 V and
> 42 V/230 V~/400 V~ cables sepa-
rately.
■ Only strip the minimum of insulation
from cables just ahead of the terminals
and bundle them tightly and close to
the corresponding terminals.
■ Secure cables with cable ties.
■ If 2 components are connected to the
same terminal, press both cores
together in a single wire ferrule.
(cont.)
This prevents wires from drifting into the
adjacent voltage area in the event of fault
(e.g. when a wire comes loose).
!
Installation sequence
Please note
In terms of safety, the BUS cable
for the internal/external unit
(12 V or 43 V) does not count as
a LV lead.
The BUS cable must be routed
together with the 230 V cables.
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