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Indoor installation An indoor environment is an environment in rooms that are
designed such that objects are largely separated from the
direct influence of an open-air climate.
If the operating and ambient conditions differ
from the standard conditions to
DIN VDE 0660 Part 500, Item 6.1, appropriate
measures must be taken to protect and
maintain the operating capability of the
switchgear and controlgear assembly for
"Special operating and ambient conditions"
according to Item 6.2 (mechanical protection,
ventilation, indoor heating, breathers
etc.).
No additional measures required.
External installation An external environment is an environment in rooms that are
designed such that objects are protected against direct
sunlight and precipitation and possibly against wind, but
otherwise are exposed to an open-air climate.
Measures: e.g. protected installation or
protective roof, if appropriate with additional walls
and door (protective cabinet).
Outdoor installation An open-air climate is an environment that affects objects in
the open air.