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Wiring Requirements and
Recommendation
DG Safety Relay
Power, Ground, and Wire
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 that dictate the maximum current
allowable for each wire size. Current above the maximum rating can cause
wiring to overheat, which can cause damage.
• Allow for at least 50 mm (2 in.) between I/O wire 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 must be
perpendicular.
• Do not run signal or communications wiring and power wiring in the
same conduit. Route wires with different signal characteristics 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 to label wire. Use colored insulation as
well to identify wiring by signal characteristics. For example, 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 can withstand 60/75 °C (140/167 °F).
Terminal Torque
Torque terminals to 0.4 N•m (4 lb•in).
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
4
Chapter
37
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