Siemens SIVACON S4-ALPHA Maintenance Book page 39

Conclusions
ENG
In the previous paragraphs, it is explained
all different phases about a switchboard
from design to maintenance.
The phases are mutually interconnected
and depend on a rational manner.
In particular, ordinary and preventive
maintenance interventions must be
performed at well specified intervals.
As for operations on live parts (by
qualified and trained personnel, CEI 64-8
par. 29.1), ensuring continuity of service
it is indispensable to use the specific
segregation versions in strict compliance
with the standards.
For large-sized Power Center (primary)
panels we recommend using the highest
versions.
Lower construction versions (1, 2B) are
suggested for secondary switchboard.
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SIVACON S4 - ALPHA