Samson 3730 - Electrical Connections

3.2 Electrical connections
For electrical installation, you are re
-
quired to observe the relevant elec
-
trotechnical regulations and the acci
-
dent prevention regulations that ap
-
ply in the country of use. In Germa
-
ny, these are the VDE regulations
and the accident prevention regula
-
tions of the employers' liability insu
-
rance association.
The following standards apply for in
-
stallation in hazardous areas:
EN 60079-14: 2003 (VDE 0165
Part 1) "Electrical apparatus for ex-
plosive gas atmospheres" and
EN 50281-1-2: 1999 (VDE 0165
Part 2) "Electrical apparatus for use
in the presence of combustible
dust".
For the interconnection of intrinsical-
ly safe electrical equipment, the per-
missible maximum values specified
in the EC type examination certifica-
te apply (U
i
or U
o
; I
i
or I
o
; P
i
or P
o
; C
i
or C
o
, and L
i
or L
o
).
For EEx nA equipment (non-sparking
apparatus), the standard EN 50021:
1999 specifies that connecting, inter
-
rupting, or switching circuits while
energized is only allowed during in
-
stallation, maintenance or repair
work.
For EEx nL equipment (energy-limit
-
ed apparatus), the standard
EN 50021: 1999 allows this type of
equipment to be switched under nor
-
mal operating conditions.
Caution!
The terminal assignment specified in the cer
-
tificate must be adhered to. Reversing the
assignment of the electrical terminals may
cause the explosion protection to become in
-
effective!
Do not tamper with enameled screws inside
or on the housing.
Note on the selection of cables and wires:
To install intrinsically safe circuits, observe
section 12 of the standard EN 60079-14:
2003 (VDE 0165 Part 1). To run multi-core
cables or lines with more than one intrinsi
-
cally safe circuit, section 12.2.2.7 of this
standard applies.
An additional cable gland can be installed
when connecting the device over two sepa-
rate cables. Cable entries left unused must
be sealed with blanking plugs. Devices used
at ambient temperatures down to –40 °C
must have metal cable entries.
Cable entries
The cable entry with M20x1.5 cable gland,
6 to 12 mm clamping area.
There is a second M20x1.5 threaded bore
in the housing that can be used for addi
-
tional connection, when required.
The screw terminals are designed for wire
cross-sections of 0.2 to 2.5 mm². Tighten by
at least 0.5 Nm.
The wires for the reference variable must be
connected to the terminals 11 and 12 lo
-
cated in the housing. Only use a current
source!
26 EB 8384-1 EN
Connections