Chapter 7 Wiring Comm5 links
40 CNT-SVN01C-EN
Recommended wiring practices
Follow these guidelines when installing communication wire:
• All wiring must comply with the National Electrical Code (NEC) and
local codes.
• Although Comm5 does not require polarity sensitivity, Trane GCS
recommends keeping polarity consistent throughout the site.
• Make sure that 24 Vac power supplies are consistent in how they are
grounded. Avoid sharing 24 Vac between Comm5 controllers.
• Avoid overtightening cable ties and other forms of cable wraps. This
can damage the wires inside the cable.
• Do not run Comm5 cable alongside or in the same conduit as 24 Vac
power. This includes the conductors running from triac-type inputs.
• In open plenums, avoid running wire near lighting ballasts, especially
those using 277 Vac.
• Use a daisy chain configuration
• Use termination resistors as described in “Termination resistance
placement for Comm5 links” on page 42
• Insulate termination-resistor leads.
• Use only one type of communication wire—do not mix different types
of wire.
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