Cable Selection - Emerson 5301HxxxxxxxxxxxxxxZZ Series Reference Manual

Reference Manual
00809-0100-4530
• trimmed close and insulated from touching the transmitter housing.
• continuously connected throughout the segment.
• connected to a good earth ground at the power supply end.
Figure 4-2: Cable Shield
A. Insulate shield
B. Minimize distance
C. Trim shield and insulate
D. Connect shield back to the power supply ground
4.3.1 Grounding - F
Signal wiring of the fieldbus segment cannot be grounded. Grounding out one of the
signal wires will shut down the entire fieldbus segment.
Shield wire ground
To protect the fieldbus segment from noise, grounding techniques for shield wire usually
require a single grounding point for shield wire to avoid creating a ground loop. The
ground point is typically at the power supply.
4.4

Cable selection

Use shielded twisted pair wiring for the Rosemount 5300 Level Transmitter to comply with
EMC regulations. The cables must be suitable for the supply voltage and approved for use
in hazardous areas, where applicable. For instance, in the U.S., explosion-proof conduits
must be used in the vicinity of the vessel. For the ATEX flameproof and the IECEx approval
versions of the Rosemount 5300 Level Transmitter, suitable conduits with sealing device
or flameproof (EEx d) cable glands must be used depending on local requirements.
Use 18 AWG to 12 AWG to minimize the voltage drop to the transmitter.
Note
Avoid running instrument cable next to power cables in cable trays or near heavy electrical
equipment.
Reference Manual
™
Fieldbus
OUNDATION
Electrical installation
April 2019
95