3.1.7
Wiring
Field wiring cables
The diameter has to match the clamping range of the used cable gland.
The cross-section has to match the clamping range of the connection
terminals and the maximum current must be considered.
All field wiring must have insulation suitable for at least 250 Vac.
The temperature rating must be at least 194 °F (90 °C).
Use a shielded cable when there are electrical interferences present that are
higher than stated in the EMC standards. Otherwise, an unshielded
instrumentation cable can be used.
Guiding the cables in the terminal box
The field wiring cables must be cut to a length to be able to properly fit them
into the terminal box.
Connection terminals
When preparing cable wires for connection to terminals in a standard or type
'D' housing, the wire insulation must be stripped to show no more than 0.31
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.
3.1.8
Cable glands
The screwed cable gland and stopping plug must have the following
specifications:
•
Ingress protection IP67
•
Temperature range from -40 °C to +80 °C
•
Hazardous area certification (depending on where the unit is installed)
•
Pull relief
Ensure the screwed cable gland safely seals the cable and is tight enough to
prevent water ingress. Unused conduit or cable entries must be sealed with a
stopping (blanking) plug.
A strain relief must be provided for the field wiring cables when the device is
installed with the factory-provided cable glands.
Cable glands and conduit system for ATEX or IECEx
The installation must comply with the regulations of the country where the
level switch is installed.
October 2020
Quick Start Guide
Quick Start Guide
15
