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Rack Installation Guide 21

Wide-Hole Spacing Racks

Racks with wide-hole spacing have an alternating pattern of two holes per rack unit with

center-to-center hole spacing (beginning at the top hole of a 1-U space) of 31.7 mm and 12.7 mm

(1.25 inches and 0.5 inch) for the front and back vertical columns of holes (see Figure 1-12).

Figure 1-12. Two-Post, Open-Frame Relay Rack Wide-Hole Spacing

To mark the rack, perform the following steps:

Place a mark on the rack's front vertical rails where you want to locate the bottom of the

system you are installing in the two-post rack.

The bottom of each 1-U space is at the middle of the narrowest metal area between holes.

NOTE: If your rack has wide-hole spacing, go to step 3.

Place a mark 44 mm (1.75 inches) above the original mark you made (or count up three holes

in a rack with universal-hole spacing) (see Figure 1-11).

Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with universal-hole spacing has

three holes with center-to-center spacing between holes (beginning at the top of a 1-U space)

of 15.9 mm, 15.9 mm, and 12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) (see Figure 1-11).

NOTE: If your rack has universal-hole spacing, you have completed the procedure for marking

the rack.

Place a mark 44 mm (1.75 inches) above the original mark you made (or count up to the next

hole in the rack with wide-hole spacing (see Figure 1-12).

Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with wide-hole spacing has

two holes with center-to-center spacing between holes (beginning at the top of a 1-U space)

of 31.7 mm (1.25 inches) (see Figure 1-12).

1 U (44 mm or 1.75 inches)

12.7 mm (0.5 inch)

31.7 mm (1.25 inches)

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Dell PowerEdge 860 Bedienungsanleitung Seite 23