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70 CHAPTER 4: SWITCH INSTALLATION
■ Bundle the cables wherever cable bending cannot be avoided. However, the
cable ties cannot be placed inside the bending area in case of the likelihood of
cable core break due to excessive stress. See the following figure.
Figure 53 Cable bundling example III
■ The spare cables or excessive cable parts should be folded and bundled and
placed at a right place in the cabinet or on the cabling channel. A “right place”
refers to the place where the cables will not affect the operation of the device
or impair the device, or be damaged;
■ The power cords cannot be tied on the guides of any mobile components;
■ Reserve some redundancy for the cables connecting to the mobile parts, the
PGND wire of the door for example, to free the cables from possible stress.
Such a mobile part should be installed in such a way that the extra cable
segments will be kept from contacting the heat source, sharp points or edges.
Use high temperature cables near the heat sources;
■ For the cable terminals fixed using screw threads, the screws or nuts should be
securely fastened and prevented from loosing. See the following figure;
Figure 54 Cable fixing example
Flat
washer
Flat
washer
Spring
washer
Nut
Flat
washer
Flat
washer
Spring
washer
Nut