National Instruments FieldPoint cFP-RLY-425 Operating Instructions Manual page 6

Wire the screw terminals and place the connector in the shell as
shown in Figure 4. Make sure that you use the half of the shell with
the strain-relief screw holes.
Figure 4. Placing the Screw-Terminal Connector in the Shell
Install the strain-relief bar as shown in Figure 5.
Figure 5. Installing the Strain-Relief Bar on the Connector Shell
cFP-RLY-425 6 ni.com