34 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 3 Wire Your Controller
Wire without Spade Lugs
When wiring without spade lugs, we recommend that you keep the finger-safe
covers in place. Loosen the terminal screw and route the wires through the
opening in the finger-safe cover. Tighten the terminal screw making sure the
pressure plate secures the wire.
Wire with Spade Lugs
The diameter of the terminal screw head is 5.5 mm (0.220 in.). The input and
output terminals of the MicroLogix 1400 controller are designed for a 6.35 mm
(0.25 in.) wide spade (standard for #6 screw for up to 14 AWG) or a 4 mm
(metric #4) fork terminal.
When using spade lugs, use a small, flat-blade screwdriver to pry the finger-
safe cover from the terminal blocks as shown below. Then loosen the terminal
screw.
Use Surge Suppressors Because of the potentially high current surges that occur when switching
inductive load devices, such as motor starters and solenoids, the use of some
type of surge suppression to protect and extend the operating life of the
Table 2 - Wire Requirements
Wire Type
Wire Size (2 wire maximum per terminal screw)
1 wire per terminal 2 wire per terminal
Solid Cu-90°C (194°F) #12…#20 AWG #16…#20 AWG
Stranded Cu-90°C (194°F) #14…#20 AWG #18…#20 AWG
Wiring torque = 0.56 N•m (5.0 lb•in) rated
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