Rockwell Automation Publication 440R-UM010A-EN-P - May 2015
13
Chapter
3
Power, Ground, and Wiring
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 communications 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
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 mm
2
(24 AWG)
to 2.5 mm
2
(14 AWG). Use copper that withstands 60 / 75 °C.
Terminal Torque
Terminals should be torqued to 0.4 N•m (4 lb•in).
WARNING:
Before you install and wire any device, disconnect power to the
system.
WARNING:
Calculate the maximum possible current in each power and
common wire. Observe all electrical codes dictating the maximum current
allowable for each wire size. Current above the maximum ratings may cause
wiring to overheat, which can cause damage.
