Electrical Connections - Samson 3767 Mounting And Operating Instructions

Connections
4.2 Electrical connections
DANGER!
For electrical installation, observe the
relevant electrotechnical regulations
and the accident prevention regula-
tions that apply in the country of use.
In Germany, these are the VDE regu-
lations and the accident prevention
regulations of the employers' liability
insurance.
The following regulations apply to in-
stallation in hazardous areas:
EN 60079-14: 2008 (VDE 0165,
Part 1) Explosive Atmospheres – Elec-
trical Installations Design, Selection
and Erection.
Adhere to the terminal assignment.
Switching the assignment of the elec-
trical terminals may cause the explo-
sion protection to become ineffective.
Do not loosen enameled screws in or
on the housing. The maximum per-
missible values specified in the EC-
type examination certificates apply
when interconnecting intrinsically
safe electrical equipment (U
or I , P or P
0 i
Selecting cables and wires
Observe clause 12 of EN 60079-14: 2008
(VDE 0165, Part 1) for installation of the in-
trinsically safe circuits.
Clause 12.2.2.7 applies when running multi-
core cables and wires with more than one
intrinsically safe circuit.
36
or U
i
, C or C and L or L
0 i 0 i
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 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.
Fit equipment used in ambient temperatures
below –20 °C with metal cable entries.
Zone 2/Zone 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 according
to EN 60079-15:2003 may be switched un-
der normal operating conditions.
, l
0 i
The maximum permissible values specified
).
0
in the statement of conformity and its ad-
denda apply when interconnecting the
equipment with energy-limited circuits in
type of protection Ex nL IIC.
EB 8355-2 EN