The selection equipment according external influences necessary not only for proper
functioning, but also ensure the reliability the measures protection for safety complying
with the rules for "Protection for Safety" IEC 364, Chapters 46. Such protection shall not adversely
affect the equipment thus protected.
Table 8.EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION
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If the equipment does not, its construction, have the characteristics relevant the
external influences, may nevertheless used condition that provided with appropriate
additional protection the erection the installation.4 Characteristics electrical equipment regarding the presence flora and fauna
Code External influence Characteristics required for selection and
erection equipment
AK
AK1
AK2
Presence flora and/or moulds
growth
No hazard
Hazard
Normal
Special protection, such as:
- increased degree protection (see AE)
- special materials protective coating of
enclosures
- arrangement exclude flora from location
AL
AL1
AL2
Presence fauna
No hazard
Hazard
Normal
Protection may include:
- appropriate degree protection against
penetration foreign solid bodies (see AE)
- sufficient mechanical resistance (see AG)
- precaution exclude fauna from the location
(such cleanliness, use pesticides)
- special equipment protective coating of
enclosures
. Measures protection
afforded the construction equipment are only valid for the given conditions external
influence the corresponding equipment specification tests are made these conditions of
external influence.
When different influences occur simultaneously, they may have independent mutual effect
and the degree protection shall provided accordingly
