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General Wiring Guidelines
Follow these guidelines with regard to noise coupling. Intrinsic safety
requirements should prevent most or all of these situations from occurring.
They are provided as a general reference for wiring.
• If it must cross power feed lines, it should do so at right angles.
• Route at least 1.5 m (5 ft) from high-voltage enclosures, or sources of
rf/microwave radiation.
• If the conductor is in a metal wireway or conduit, each section of that
wireway or conduit must be bonded to each adjacent section so that it
has electrical continuity along its entire length, and must be bonded to
the enclosure at the entry point.
For more information on general wiring guidelines, see the Industrial
Automation Wiring and Grounding Guidelines, publication 1770-4.1.
Wire External To Enclosures
Cables that run outside protective enclosures are relatively long. To minimize
cross-talk from nearby cables, it is good practice to maintain maximum
separation between the ControlNet cable and other potential noise
conductors. You should route your cable following these guidelines:
Table C.4
Is the cable in a
contiguous metallic
wireway or conduit?
Yes
No
Determine Your ControlNet Media Requirements
Route Your
From Noise Sources of This Strength
Cable at Least
0.08 m (3 in)
Category-1 conductors of less than 20 A
0.15 m (6 in)
ac power lines of 20 A or more, up to 100
KVA
0.3 m (12 in)
ac power lines greater than 100 KVA
0.15 m (6 in)
Category-1 conductors of less than 20 A
0.3 m (12 in)
ac power lines of 20 A or more, up to 100
KVA
0.6 m (24 in)
ac power lines greater than 100 KVA
Publication CNET-UM001C-EN-P - November 2005
C-21
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