Pepperl+Fuchs LUC-T Series, Руководство пользователя, Страница: 43 / 112

5
e
2 Safety conventions and
symbols
In order to highlight safety-relevant or
alternative operating procedures in the
manual, the following conventions
have been used, each indicated by a
corresponding icon in the margin.
Symbol Meaning
Device certified for use in explosion hazardous areas
If the LUC-T has this symbol embossed on its name plate it can be installed in an explosion
hazardous area.
Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas.
• Devices located in and wiring entering areas with the designation "explosion hazardous
areas" must conform with the stated type of protection.
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas.
• Devices located in safe areas still require a certificate if their outputs run into explosion
hazardous areas
Direct voltage
A terminal to which or from which a direct current or voltage may be applied or supplied.
Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage may be
applied or supplied.
Grounded terminal
A grounded terminal, which as far as the operator is concerned, is already grounded by
means of an earth grounding system.
Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other connection to
the equipment.
Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e. g. neutral star or
equipotential line according to national or company practice.
Explosion protection
Electrical symbols