Rockwell Automation Publication 440R-UM012E-EN-P - November 2018 17
Chapter 3
Power, Ground, and Wire
Wiring Requirements and
Recommendation
• Allow for at least 50 mm (2 in.) between I/O wiring ducts or terminal
strips and the relay.
• Route incoming power to the relay by a path separate from the device
wiring. Where paths must cross, their intersection should be
perpendicular.
• Do not run signal or communication wiring and power wiring in the
same conduit. Wires with different signal characteristics should be
routed by separate paths.
• Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
• Separate input wiring from output wiring.
• Label wiring to all devices in the system. Use tape, shrink-tubing, or
other more dependable means for labeling purposes. In addition to
labeling, use colored insulation to identify wiring based on signal
characteristics. For example, you may use blue for DC wiring and red for
AC wiring.
Wire Size
Each terminal can accommodate copper wire with size from 0.2…2.5 mm2
(24…14 AWG). Use copper that withstands 60/75 °C (140/167 °F).
Terminal Torque
Torque terminals to 0.4 N·m (4 lb·in).
ATTENTION: Before you install and wire any device, disconnect power to the
system.
ATTENTION: Calculate the maximum possible current in each power and
common wire. Observe all electrical codes that dictate the maximum current
allowable for each wire size. Current above the maximum ratings may cause
wiring to overheat, which can cause damage.
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