Cabling Clearances for C Series Modules

Updated Jan 6, 2021

Reported In


  • CompactRIO Controller
  • CompactDAQ Chassis
  • CompactDAQ Controller
  • C Series Accessories
  • Transceiver Cable

Issue Details

How much clearance do the different types of C Series module connectors require for cables and backplanes?


The cable clearance varies depending on the C series module connector you use. Cables and backshells require sufficient space to prevent crimped cables, which can distort measurements.



The following table shows the amount of space required for each type of C Series module connector:

Module/Connector Type  

  Required Clearance  

NI TB-921482.3 mm (3.2 in.)
NI DB37F-DB37M LP50.8 mm (2.0 in.)
NI 992376.2 mm (3.0 in.)
NI 992476.2 mm (3.0 in.)
BNC63.5 mm (2.5 in.)
RJ5050.8 mm (2.0 in.)
37-position DSUB86.4 mm (3.4 in.)
25-position DSUB91.4 mm (3.6 in.)
15-position DSUB61.0 mm (2.4 in.)
9-position DSUB68.6 mm (2.7 in.)
NI 9975 (16-position screw terminal)40.6 mm (1.6 in.)
cRIO-9936 (10-position screw terminal)48.3 mm (1.9 in.)
NI 9976 (2-position screw terminal)30.5 mm (1.2 in.)
NI 9974 (36-position spring terminal)48.3 mm (1.9 in.)
NI 9966 (24-position spring terminal)58.4 mm (2.3 in.)
NI 9973 (6-position spring terminal)43.2 mm (1,7 in.)
NI TRC-8542/3/650.8 mm (2.0 in.)