NEC 140Rc-4 16. Install the arm bracket on the mount face at the rear of the rack or the slide rail assembly., NOTE:

Setting Up Your Server 3-17
16. Install the arm bracket on the mount face at the rear of the rack or the slide rail assembly.
NOTE: Two types of arm brackets are provided to be fit to any
distance between the front and rear mount faces of the rack.
Use arm bracket (700) if the distance between the front and rear mount
faces of the rack is 700 or 743 mm. Use arm bracket (900) for the rack
having the depth of 760 or 900 mm.
 For the distance between the mount faces at the front and rear of the rack being 700 or 743
mm:
Fix the arm bracket (700) to the core nuts installed on the mount face of the rear of the
rack with two screws C.
Mount face
Mount face
A
rm bracket (700)
Core nut installation
position