3Com LS8M1P12TEH Installation Manual page 184

Installation Manual
H3C S7500 Series Ethernet Switches
(1) Expansion tube
(3) Expansion nut
Figure A-25 Install an expansion nut to an expansion tube.
Caution:
You must insert the alignment rib of expansion nuts into the alignment grooves of
expansion tubes, or you will be unable to install or fasten the expansion bolts.
II. Adjusting rack height
According to the floor height and the height silkscreen of the antistatic floor on the rack,
adjust all racks to the estimated height and torque the retaining bolts to 45 Nm with a
torque spanner, from middle to the two sides, as shown in Figure A-26.
III. Installing and fixing racks
As shown in Figure A-26, follow these steps to install and fix a rack:
1) Clean the floor and rack surface.
2) Align the rack installation holes with the corresponding expansion bolts and fix the
rack on the floor with bolts, spring washers and big flat washers.
3) Torque the bolts to 45 Nm. Note to do that diagonally to reduce stress between the
bolts and the rack and facilitate rack adjustment during installation.
Repeat these steps to install other racks. Figure A-26 shows how to fix a rack onto the
floor.
Appendix A B68-22 Cabinet Installation
(2) Alignment grove
(4) Alignment nut
A-23