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October 2020
in. (8 mm) of the copper strands. For Type 'DE' housings, remove insulation
of no more than 0.35 in. (9 mm). Always check that the power supply is
disconnected or switched-off to avoid coming into contact with dangerous
live parts.
Connection terminals
When preparing cable wires for connection to terminals, the wire insulation
must be stripped to show no more than 0.31 in. (8 mm) of the copper
strands. Always check that the power supply is disconnected or switched-off
to avoid coming into contact with dangerous live parts.
3.2.7
Cable glands, conduits, and blanking plugs in hazardous area
installations
General installation
•
Installation of this equipment shall be carried out by suitably trained
personnel, in accordance with the applicable code of practice.
•
Seal the un-used conduit entries with a suitably rated blanking plugs.
•
Use only factory-supplied parts, where applicable.
•
A suitable strain-relief must be provided for the wiring cables when the
level switch is installed with the factory-supplied cable glands.
•
The diameter of the wiring cable must match to the clamping range of
the cable clamp.
•
For parts that are not factory-supplied, it is the responsibility of the
installer to ensure:
—
The parts have a certification and type of protection that is
equivalent to the approval of the level switch.
—
The parts have an ambient temperature range that complies with the
specification of the level switch plus 10 Kelvin.
—
The parts must be installed in accordance with the installation
instructions of the part manufacturers.
Installation of a flameproof or explosion-proof Rosemount 2521 with a
conduit system
In a conduit system, single electric conductors are installed in a certified pipe
system. This pipe system must also have a flameproof or explosion-proof
construction.
For ATEX and IECEx approvals, both enclosure of the level switch and pipe
system need to be isolated from each other by using a certified flameproof
or explosion-proof seal. The seal must be installed directly in, or at, the
conduit entries of the level switch. Unused conduit entries must be sealed
using suitably certified blanking elements (stopping plugs).
Quick Start Guide
Quick Start Guide
17
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