ABB S800 I/O User Manual page 50

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The ground wire which joins the grounding systems should be ≥35 mm
copper (Cu),
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Cabinets supplied with 120/220V a.c. always must be connected tp protective earth
(PE) grounding. The equipment PE-conductor should be of 35 mm
section if copper lead.
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For minimum interference and maximum accuracy, it is normally most effective to
ground the signals from transmitters or transducers directly at a grounding point
within the cabinet. It is also advantageous to ground supply voltages for transducers,
sensing voltage for contacts, load supply voltage and so on at the same location.
All modules have galvanic isolation from the chassis; this means that group-wise
isolated modules can be grounded in different equipment as for long as all channels
have a common ground reference at the same location.
40
Figure 2-15.
Cabinets
or enclosure
Protective
Ground
M
Avtˆ…r ! $ B…‚ˆqvtÂsÃ@yrp‡…‚vpÃ@„ˆvƒ€r‡
2
Shield bar
Ground Plane
2
> 35 mm
(> 2 AWG)
2
(2 AWG) cross
3BSE 020 923R101
(2 AWG)