SMY133-SMY134-SMP133 Operating Manual
2. Installation
2.1 Meaning of the symbols used on instrument
Warning – read operating manual !
AC – alternating voltage
DC – direct voltage
CE marking guarantees compliance with the European directives and regulations
The instrument must not be disposed of in the normal unsorted municipal waste
stream
Basic insulation instrument (protection class I)
Double or reinforced insulation instrument (protection class II)
2.2 Physical
The instrument is built in a plastic box to be installed in a distribution board panel. As a rule, the panel
is a part of a switchboard door - then the installation must be such that the switchboard door can be
closed under all conditions of use. In any case, it must be ensured that only the front panel of the
instrument is accessible to laypersons. Therefore, if the switchgear is located in an area accessible to
laypersons, the switchgear door or panel must only be opened by means of a tool, or the door must be
locked.
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Fig. 2.1a : Panel Mounting
switchboard outer side
accessible to laymen
minimum protection IP40
switchboard inner side
inaccessible to laymen
protection IP20 or lower