Cabling; Cable And Earth/Ground Regimes - Honeywell Sensepoint XCD Technical Manual

Sensepoint XCD Technical Manual

6.4 Cabling

The use of industrial grade, suitably armoured field cable is recommended.
For example, screened 3 cores (plus screen 90% coverage), suitably mechanically
protected copper cable with a suitable M20 explosion-proof gland, or ¾" NPT steel
conduit, with 0.5 to 2.5 mm2 (20 to 13 AWG) conductors. Ensure the cable gland is
installed correctly and fully tightened. All unused cable/conduit entries must be sealed with
a suitable certified sealing plug (one plug is supplied).

6.5 Cable and Earth/Ground regimes

Effective Earth/Ground bonding is important to ensure good EMC and RFI immunity.
The following diagrams show examples of how to earth/ground bond the cable at
enclosures. The same principles apply to conduit installations. These bonding techniques
provide good RFI/EMC performance. Earth/ground loops must be avoided to prevent the
risk of false signal variation.
Cable to Transmitter
Cable outer sheath
Transmitter
Controller
Clean / Instrument
Earth Screen
Cable inner sheath
Diagram 9: Controller Grounding
Power & Signal
Earth Screen
Diagram 10: System grounding
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Controller