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 3/4’ NPT steel conduit, with 0.5 to 2.5 mm
2
(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).
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.
Controller
Cable outer sheath
Cable inner sheath
Diagram 12 System grounding
CAUTION
All unused and used cable/conduit entries must be sealed with a suitable certified
sealing plug and cable gland.
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