Electrical Connections; Electrical Connection For Type Of Protection Ex D - Samson 4747 Mounting And Operating Instructions

6 Electrical connections

DANGER
!
Risk of fatal injury due to the formation of
an explosive atmosphere.
Incorrect installation, operation or mainte-
nance of the limit switch in potentially explo-
sive atmospheres may lead to ignition of the
atmosphere and ultimately to death, even
with a harmless supply voltage.
− For mounting and electrical installation in
hazardous areas, observe the explosion
protection approvals as well as the relevant
electrotechnical regulations and the acci-
dent prevention regulations that apply in
the country of use. EN 60079-14 applies
in Europe.
− Do not connect the electrical supply before
mounting is completed.
− Installation, operation or maintenance of
the limit switch must only be performed by
personnel with qualifications according to
Clause 4.5 of IEC 60079-14 who has un-
dergone special training or instructions or
who is authorized to work on explo-
sion-protected devices in hazardous areas.
− Do not open devices with flameproof en-
closures while they are energized.
NOTICE
!
The Type 4747 Limit Switch is designed to
operate under exactly defined electrical
conditions.
Only connect the limit switch to a suitable
power supply after mounting is completed.
EB 4747 EN
6.1 Electrical connection for
type of protection Ex d
DANGER
!
Loss of the explosion protection due to
damage to the cover's thread and/or the
connecting thread.
Do not open devices with flameproof enclo-
sures while they are energized.
WARNING
!
The use of unapproved cable glands will
render the explosion protection unsafe.
Only use cable glands and screw plugs
which are approved for type of protection
Ex d and the certified temperature range.
Connect the devices using suitable cable en-
tries or conduit systems that comply with
EN 60079-1 Explosive Atmospheres –
Part 1: Equipment Protection by Flameproof
Enclosures "d", Clauses 13.1 and 13.2 and
for which a separate test certificate is avail-
able.
Do not use cable entries and blanking plugs
of simple construction.
Î Install the connecting cable properly so
that it is protected against mechanical
damage.
Î If the temperature at the entry parts ex-
ceeds 70 °C, use a temperature-resistant
connecting cable:
Electrical connections
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