AT&T 75 Wiring Manual page 263

Labels for Cross-Connect Field.
Sneak Fuse Panels
Installing the Cross-Connect Field
Wall Mounting 110A-Type Terminal Blocks
The preferred cross-connect field location is directly behind the switch cabinet. However,
the 110A-type hardware can be stacked in almost any arrangement at any height or location
on the wall. One arrangement is shown in Figure 3-25. The mounting screw distance
between the holes on the terminal blocks is 10-13/16 inches (27.5 cm). If a vertical patch
cord trough is used in the installation, the mounting screw distance for it is 5-5/16 inches
(27.5 cm).
Wall Mounting 110P-Type Terminal Blocks
The preferred cross-connect field location is directly behind the switch cabinet. The first
terminal block of the Trunk/Auxiliary Field is aligned with the left side of the switch
cabinet (see Figures 3-26 or 3-27). This arrangement allows for growth on the right side of
the cross-connect field.
To install the cross-connect field, proceed as follows:
1. If 300-pair terminal blocks are to be installed, draw a level horizontal line on the
mounting wall 47-1/2 inches (120.7 cm) above the floor (Figure 3-29). If 900-pair
terminal blocks are to be mounted, draw a level horizontal line on the mounting
wall 23 inches (58.4 cm) above the floor (Figure 3-30).
2.
Partially install two 3/4-inch (1.9-cm) No. 12 wood screws 7-11/16 inches (19.5 cm)
apart on the line on the left side of the wall for mounting the first
Trunk/Auxiliary Field terminal block.
3.
Slide the bottom terminal block feet onto the mounting screws and mark the
remaining mounting screw locations.
4.
Remove the terminal block and partially install the remaining mounting screws.
5.
Replace the terminal block on the mounting screws and tighten the screws to
secure.
6.
If a vertical patch cord trough is to be installed, partially install the first screw for
the patch cord trough, on the line, 7/8 inch (2.2 cm) from the previous screw.
Partially install the second mounting screw 5-5/16 inches (13.5 cm) from the screw
just installed. Repeat steps 3, 4, and 5 above.
7 .
If another Trunk/Auxiliary Field terminal block is to be installed, partially install
the first screw for the terminal block, on the line, 7/8 inch (2.2 cm) from the
previous screw. Partially install the second mounting screw 7-11/16 inches (19.5
cm) from the screw just installed. Repeat steps 3, 4, and 5 above.
8 .
If a horizontal patch cord trough is to be installed, install it, on the line, between
the Trunk/Auxiliary Field and the Distribution Field.
9 .
Partially install two 3/4-inch (1.9 cm) No. 12 wood screws 7-11/16 inches (19.5 cm)
apart on the line, to the right of the horizontal patch cord trough, for installing the
first Distribution Field terminal block. Repeat steps 3, 4, and 5 above.
10. If another Distribution Field terminal block is to be installed, partially install the
first screw for the terminal block, on the line, 7/8 inch (2.2 cm) from the previous
screw. Partially install the second mounting screw 7-11/16 inches (19.5 cm) from
the screw just installed. Repeat steps 3, 4, and 5 above.
110-TYPE HARDWARE
3-47