Distech Controls ECB-PTU Series Installation Manual page 15

Figure 25: Installed strain relief
Tie wraps can then be used to group wires together and attach them securely to the strain relief in an effort to relieve undue tension. Distech Controls recommends using 0.184'' (4.6 mm) wide tie wraps with a 50 lbs (220 N) tensile strength to attach wires to the strain relief.
Figure 26: Attaching wires together and to the strain relief - detail
Figure 27: Attaching wires together and to the strain relief - completed
If necessary, the terminal block cover can then be clipped onto the strain relief as shown below.
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