Chapter 8 Electrical Installation
Mini-Switch LB 471
Chapter 8. Electrical Installation
The special aspects of intrinsically safe installation have to be tak-
en into consideration.
In Ex-areas the detector has to be connected with the equipoten-
tial busbar of the facility.
In Ex-areas and for measurements that are not intrinsically safe
the evaluation unit has to be disconnected from power during the
electrical installation.
If the intrinsically safe electric circuit is installed in areas engen-
dered of dust explosion which are classified as area 20 or 21, it
has to be ensured that the devices which are connected to these
electric circuits fulfill the requirements of category 1D or 2D and
have been certified accordingly.
A length of thread
1
of 50 mm has to be observed between intrinsi-
cally safe connections and connections that are not intrinsically
safe.
The maximum cable length between detector and evaluation unit
has to be observed. It is dependent on the capacity and inductivity
of the cable used and is limited by the max. permissible values
stated on the ATEX certificate on page 109. If you are using the
cable #32024 supplied by BERTHOLD TECHNOLOGIES, then the max.
cable length is 1000m.
The EU type verification documents are shown on page 109.
Malfunction due to electromagnetic fields in the line between eval-
uation unit and detector.
Installation of the line in multi-wire cables is permitted, provided
the other parallel running wires are only signal lines, not power
lines.
If electromagnetic interference is likely to occur in the line, the
cable has to be installed separately in a shielded cable. The screen
may be put onto the detector only one-sided.
Strong electromagnetic fields in the line are not permitted. The
lines have to be installed such that they do not run parallel to HV-
power cable or, for example, frequency converter lines.
The 2-wire connection cable between detector and evaluation unit
must not exceed 40Ω
2
.
The length of thread is the shortest distance between two points that
can be connected by a thread.
Feed and return line
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