National Instruments CFP-CB-3 - Manual (Page 8)

cFP-CB-1/2/3/4 8 ni.com
Wiring to the cFP-CB-4 for High-Vibration Environments
and Hazardous-Voltage Applications
If your application is subject to high vibration or hazardous
voltage, National Instruments recommends affixing ferrules to the
ends of all signal wires. Refer to Figure 10.
Figure 10. Inserting a Wire with a Ferrule into the cFP-CB-4