Operating instructions

5.2 Electrical connections
DANGER!
Risk of electric shock and/or the
formation of an explosive atmo
-
sphere!
–
For electrical installation, observe the rel
-
evant electrotechnical regulations and
the accident prevention regulations that
apply in the country of use.
–
The following regulations apply to
mounting and installation in hazardous
areas: EN 60079-14: 2008 Explosive
atmospheres – Part 14: Electrical instal
-
lations design, selection and erection (or
VDE 0165 Part 1).
NOTICE
– Adhere to the terminal assignment!
– Switching the assignment of the electrical
terminals may cause the explosion pro-
tection to become ineffective!
–
Do not loosen enameled screws in or on
the housing.
–
The maximum permissible values speci
-
fied in the national EC type examination
certificates apply when interconnecting
intrinsically safe electrical equipment (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
).
Selecting cables and wires:
Observe Clause 12 of EN 60079-14: 2008
(VDE 0165 Part 1) when installing intrinsi
-
cally safe circuits. The Subclause 12.2.2.7
applies when running multi-core cables con
-
taining more than one intrinsically safe cir
-
cuit.
In particular, the radial thickness of the con
-
ductor insulation for common insulation ma
-
terials, such as polyethylene, must have a
minimum radial thickness of 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 fer
-
rules.
When two separate cables are used for con
-
nection, an additional cable gland can be
installed.
Seal cable entries left unused with plugs.
Devices used at ambient temperatures be
-
low –20 °C must be fitted with metal cable
glands.
Equipment for use in zone 2/zone 22
In equipment operated with type of protec-
tion Ex nA II (non-sparking equipment) ac-
cording 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 (en
-
ergy-limited equipment) according to
EN 60079-15: 2003 may be switched un
-
der normal operating conditions.
The maximum permissible values specified
in the Statement of Conformity or its ad
-
denda apply when interconnecting the
equipment with energy-limited circuits in
type of protection Ex nL IIC.
EB 8384-1 EN 35
Connections