Samson 3964, Mounting And Operating Instructions

Page: 13 / 32

EB 3964 EN 13
Electrical connection
4.1 Connecting cable
A connector type C according to
EN 175301-803 (distance between contacts
8 mm) or a connector type C according to
industrial standard (distance between con-
tacts 9.4 mm) is used for the electrical con -
nection.
Observe
clause 12 of EN 60079-14: 2008
(VDE 0165, Part 1) for installation of the
intrinsically safe circuits. Clause 12.2.2.7
applies when running multi-core cables and
wires with more than one intrinsically safe
circuit.
Preferably use connecting lines with mini-
mum 0.5 mm² conductor cross-section and
3.5 to 6 mm outside diameter.
The radial thickness of the insulation of a
conductor for common insulating materials
(e.g. polyethylene) must not be smaller than
0.2 mm. The diameter of an individual wire
in a fine-stranded conductor must not be
smaller than 0.1 mm. Protect the conductor
ends against splicing, e.g. by using wire-end
ferrules.
1 2
Fig. 6: Wiring diagram for connector
Adhere to the terminal assignment. Switch -
ing the assignment of the electrical terminals
may cause the explosion protection to be -
come ineffective.
Do not loosen enameled screws in or on the
housing.
The maximum permissible values specified in
the EC type examination certificates apply
when interconnecting intrinsically safe elec
-
trical equipment (U
i
or U
0
, l
i
or I
0
, P
i
or P
0
, C
i
or C
0
and L
i
or L
0
). See page 15.
4.2 Devices for Zones 2 and
22
In equipment operated according to type of
protection Ex nA II (non-sparking equipment)
according to EN 60079-15:2003, circuits
may be connected, interrupted or switched
while energized only during installation,
maintenance or repair.
Equipment connected to energy-limited cir-
cuits with type of protection Ex nL (ener -
gy-limited equipment) according to
EN 60079-15:2003 may be switched under
normal operating conditions.
The maximum permissible values specified in
the statement of conformity or its addenda
(see page 13) apply when interconnecting
the equipment with energy-limited circuits in
type of protection Ex nL IIC.
WARNING !